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Romero Bhathal J, Marsh L, Levitt MR, Geindreau C, Aliseda A. Towards Prediction of Blood Flow in Coiled Aneurysms Before Treatment: A Porous Media Approach. Ann Biomed Eng 2023; 51:2785-2801. [PMID: 37598136 PMCID: PMC10841334 DOI: 10.1007/s10439-023-03340-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 07/30/2023] [Indexed: 08/21/2023]
Abstract
Modeling blood flow in aneurysms treated with coils could be used to understand the complete embolization of the aneurysm, through thrombus formation that fills the entire sac. Modeling of the endovascular coil mass as a porous medium is a technique that allows for study of aneurysm hemodynamics, efficiently for patient-specific treatment outcome predictions. Models in the literature use mean porosity of coils in the aneurysmal volume, proving inadequate for outcome prediction. However, models that consider heterogeneous porosity distribution have shown more accurate hemodynamics. We recently published the porous crown model, considering the heterogeneous coil mass distribution, validated on two patients. This study aims (i) to validate the porous crown model for a larger cohort (eight patients), and (ii) to propose a porous medium model translatable to clinical practice in treatment planning. We analyzed the porosity distribution of the endovascular coils deployed inside the cerebral aneurysm phantoms of eight patients using 3D x-ray synchrotron images. The permeability and inertial factor of the porous crown model are calculated using previously published methodology. We propose a new "bilinear" porous model, that uses the same hypothesis, but the permeability and inertial factor can be defined from just basic information available in the neuro-suite, i.e., the aneurysmal sac volume and the coil volume fraction targeted by the neurosurgeon. These two models are compared to the coil-resolved simulations, considered as the gold standard. The results show that both the porous crown model and the bilinear model produce similarly accurate hemodynamics in the aneurysm. The error in the standard (mean porosity) porous model is 66%, whereas the error of the bilinear model is 26%, compared to the coil-resolved. The bilinear model is promising as a means of treatment outcome prediction at time of intervention.
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Affiliation(s)
| | - Laurel Marsh
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Michael R Levitt
- Department of Neurological Surgery, University of Washington, Seattle, WA, USA
| | | | - Alberto Aliseda
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.
- Department of Neurological Surgery, University of Washington, Seattle, WA, USA.
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2
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Romero Bhathal J, Chassagne F, Marsh L, Levitt MR, Geindreau C, Aliseda A. Modeling Flow in Cerebral Aneurysm After Coils Embolization Treatment: A Realistic Patient-Specific Porous Model Approach. Cardiovasc Eng Technol 2023; 14:115-128. [PMID: 35879587 PMCID: PMC9873836 DOI: 10.1007/s13239-022-00639-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 06/09/2022] [Indexed: 01/27/2023]
Abstract
PURPOSE Computational fluid dynamics (CFD) has been used to evaluate the efficiency of endovascular treatment in coiled cerebral aneurysms. The explicit geometry of the coil mass cannot typically be incorporated into CFD simulations since the coil mass cannot be reconstructed from clinical images due to its small size and beam hardening artifacts. The existing methods use imprecise porous medium representations. We propose a new porous model taking into account the porosity heterogeneity of the coils deployed in the aneurysm. METHODS The porosity heterogeneity of the coil mass deployed inside two patients' cerebral aneurysm phantoms is first quantified based on 3D X-ray synchrotron images. These images are also used to compute the permeability and the inertial factor arising in porous models. A new homogeneous porous model (porous crowns model), considering the coil's heterogeneity, is proposed to recreate the flow within the coiled aneurysm. Finally, the validity of the model is assessed through comparisons with coil-resolved simulations. RESULTS The strong porosity gradient of the coil measured close to the aneurysmal wall is well captured by the porous crowns model. The permeability and the inertial factor values involved in this model are closed to the ideal homogeneous porous model leading to a mean velocity in the aneurysmal sac similar as in the coil-resolved model. CONCLUSION The porous crowns model allows for an accurate description of the mean flow within the coiled cerebral aneurysm.
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Affiliation(s)
| | - Fanette Chassagne
- Mines Saint-Etienne, INSERM, UMR1059, SAINBIOSE, CIS-EMSE, Saint-Etienne, France
| | - Laurel Marsh
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Michael R Levitt
- Department of Neurological Surgery, University of Washington, Seattle, WA, USA
| | | | - Alberto Aliseda
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
- Department of Neurological Surgery, University of Washington, Seattle, WA, USA
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3
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Zennoune A, Latil P, Flin F, Perrin J, Weitkamp T, Scheel M, Geindreau C, Benkhelifa H, Ndoye FT. Investigating the influence of freezing rate and frozen storage conditions on a model sponge cake using Synchrotron X-rays micro-computed tomography. Food Res Int 2022; 162:112116. [DOI: 10.1016/j.foodres.2022.112116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/26/2022] [Accepted: 11/06/2022] [Indexed: 11/11/2022]
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Depriester D, Rolland du Roscoat S, Orgéas L, Geindreau C, Levrard B, Brémond F. Individual fibre separation in 3D fibrous materials imaged by X-ray tomography. J Microsc 2022; 286:220-239. [PMID: 35244940 DOI: 10.1111/jmi.13096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 02/09/2022] [Accepted: 02/26/2022] [Indexed: 11/28/2022]
Abstract
Modelling the physical behaviour of fibrous materials still remains a great challenge because it requires to evaluate the inner structure of the different phases at the phase scale (fibre or matrix) and the at constituent scale (fibre). X-ray Computed Tomography (CT) imaging can help to characterize and to model these structures, since it allows separating the phases, based on the grey level of CT scans. However, once the fibrous phase has been isolated, automatically separating the fibres from each other is still very challenging. This work aims at proposing a method which allows separating the fibres and localizing the fibre-fibre contacts for various fibres geometries, that is: straight or woven fibres, with circular or non circular cross sections, in a way that is independent of the fibres orientations. This method uses the local orientation of the structure formed by the fibrous phase and then introduces the misorientation angle. The threshold of this angle is the only parameter required to separate the fibres. This paper investigates the efficiency of the proposed algorithm in various conditions, for instance by changing the image resolution or the fibre tortuosity on synthetic images. Finally, the proposed algorithm is applied to real images or samples made up of synthetic solid fibres. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Dorian Depriester
- Univ. Grenoble Alpes, CNRS, G-INP, 3SR Lab., Grenoble, France.,Institute of Engineering, Univ. Grenoble Alpes
| | - Sabine Rolland du Roscoat
- Univ. Grenoble Alpes, CNRS, G-INP, 3SR Lab., Grenoble, France.,Institute of Engineering, Univ. Grenoble Alpes
| | - Laurent Orgéas
- Univ. Grenoble Alpes, CNRS, G-INP, 3SR Lab., Grenoble, France.,Institute of Engineering, Univ. Grenoble Alpes
| | - Christian Geindreau
- Univ. Grenoble Alpes, CNRS, G-INP, 3SR Lab., Grenoble, France.,Institute of Engineering, Univ. Grenoble Alpes
| | - Benjamin Levrard
- Michelin Corporation, European Center of Technologies, rue bleue, ZI Ladoux, Clermont-Ferrand, France
| | - Florian Brémond
- Michelin Corporation, European Center of Technologies, rue bleue, ZI Ladoux, Clermont-Ferrand, France
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Haffar I, Latil P, Flin F, Geindreau C, Bonnel F, Petillon N, Gervais PC, Edery V. Characterization of ice particles in jet fuel at low temperature: 3D X-ray tomography vs. 2D high-speed imaging. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.11.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Haffar I, Flin F, Geindreau C, Petillon N, Gervais PC, Edery V. Influence of interfacial tension, temperature and recirculating time on the 3D properties of ice particles in jet A-1 fuel. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Rolland du Roscoat S, Ivankovic T, Lenoir N, Dekic S, Martins JMF, Geindreau C. First visualisation of bacterial biofilms in 3D porous media with neutron microtomography without contrast agent. J Microsc 2021; 285:20-28. [PMID: 34664715 DOI: 10.1111/jmi.13063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/23/2021] [Accepted: 09/28/2021] [Indexed: 11/27/2022]
Abstract
Characterising bacterial biofilm growth in porous media is important for developing reliable numerical models of biofouling in industrial biofilters. One of the promising imaging methods to do that has been a recent successful application of X-ray microtomography. However, this technique requires a contrast agent (1-chloronaphtalene, for example) to distinguish biofilm from the liquid phase, which raises concern about biofilm disruption and impaired image interpretation. To overcome these drawbacks, we tested a new approach based on neutron tomography (NT), which does not need a contrast agent, by imaging two types of porous media (polytetrafluoroethylene - PTFE - and clay beads of various diameters) in glass or PTFE tubes in which bacterial biofilms were grown for 7 days and by comparing these images with the ones obtained with X-ray microtomography. NT images showed that the biofilm formed preferentially around the beads and at bead/bead interface. Visual comparison of both imaging techniques showed consistent biofilm spatial distributions and that the contrasting agent did not significantly disrupt the biofilm. NT images, on the other hand, were still too noisy to allow quantitative measurements. Therefore, X-ray microtomography (provided it uses non-disruptive contrast agents) seems to provide more reliable microstructural descriptors.
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Affiliation(s)
| | - Tomislav Ivankovic
- Faculty of Science, Department of Biology, University of Zagreb, Zagreb, Croatia
| | - Nicolas Lenoir
- 3SR, UMR 5521, Université Grenoble Alpes, CNRS G-INP, Grenoble, France.,Next Beamline, Institut Laue-Langevin, Grenoble, France
| | - Svjetlana Dekic
- Faculty of Science, Department of Biology, University of Zagreb, Zagreb, Croatia
| | - Jean M F Martins
- IGE, UMR 5001, Université Grenoble Alpes, CNRS G-INP, Grenoble, France
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Chivukula VK, Marsh L, Chassagne F, Barbour MC, Kelly CM, Levy S, Geindreau C, Roscoat SRD, Kim LJ, Levitt MR, Aliseda A. Lagrangian Trajectory Simulation of Platelets and Synchrotron Microtomography Augment Hemodynamic Analysis of Intracranial Aneurysms Treated With Embolic Coils. J Biomech Eng 2021; 143:1102198. [PMID: 33665669 DOI: 10.1115/1.4050375] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Indexed: 11/08/2022]
Abstract
As frequency of endovascular treatments for intracranial aneurysms increases, there is a growing need to understand the mechanisms for coil embolization failure. Computational fluid dynamics (CFD) modeling often simplifies modeling the endovascular coils as a homogeneous porous medium (PM), and focuses on the vascular wall endothelium, not considering the biomechanical environment of platelets. These assumptions limit the accuracy of computations for treatment predictions. We present a rigorous analysis using X-ray microtomographic imaging of the coils and a combination of Lagrangian (platelet) and Eulerian (endothelium) metrics. Four patient-specific, anatomically accurate in vitro flow phantoms of aneurysms are treated with the same patient-specific endovascular coils. Synchrotron tomography scans of the coil mass morphology are obtained. Aneurysmal hemodynamics are computationally simulated before and after coiling, using patient-specific velocity/pressure measurements. For each patient, we analyze the trajectories of thousands of platelets during several cardiac cycles, and calculate residence times (RTs) and shear exposure, relevant to thrombus formation. We quantify the inconsistencies of the PM approach, comparing them with coil-resolved (CR) simulations, showing the under- or overestimation of key hemodynamic metrics used to predict treatment outcomes. We fully characterize aneurysmal hemodynamics with converged statistics of platelet RT and shear stress history (SH), to augment the traditional wall shear stress (WSS) on the vascular endothelium. Incorporating microtomographic scans of coil morphology into hemodynamic analysis of coiled intracranial aneurysms, and augmenting traditional analysis with Lagrangian platelet metrics improves CFD predictions, and raises the potential for understanding and clinical translation of computational hemodynamics for intracranial aneurysm treatment outcomes.
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Affiliation(s)
| | - Laurel Marsh
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195
| | - Fanette Chassagne
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195
| | - Michael C Barbour
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195
| | - Cory M Kelly
- Department of Neurological Surgery, University of Washington, Seattle, WA 98195; Stroke and Applied Neuroscience Center, University of Washington, Seattle, WA 98195
| | - Samuel Levy
- Department of Neurological Surgery, University of Washington, Seattle, WA 98195; Stroke and Applied Neuroscience Center, University of Washington, Seattle, WA 98195
| | - Christian Geindreau
- Laboratoire 3SR, Université Grenoble Alpes, 1270 Rue de la Piscine, Gières 38610, France
| | | | - Louis J Kim
- Department of Neurological Surgery, University of Washington, Seattle, WA 98195; Stroke and Applied Neuroscience Center, University of Washington, Seattle, WA 98195; Department of Radiology, University of Washington, Seattle, WA 98195
| | - Michael R Levitt
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195; Department of Neurological Surgery, University of Washington, Seattle, WA 98195; Stroke and Applied Neuroscience Center, University of Washington, Seattle, WA 98195; Department of Radiology, University of Washington, Seattle, WA 98195
| | - Alberto Aliseda
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195; Department of Neurological Surgery, University of Washington, Seattle, WA 98195; Stroke and Applied Neuroscience Center, University of Washington, Seattle, WA 98195
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10
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Romero Bhathal J, Chassagne F, Levitt M, Geindreau C, Aliseda A. Characterization of the porosity distribution and gradients in intracranial aneurysms treated with coils. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - F. Chassagne
- Dpt. of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - M. Levitt
- Dpt. of Mechanical Engineering, University of Washington, Seattle, WA, USA
- Dpt. of Neurological Surgery, University of Washington, Seattle, WA, USA
| | - C. Geindreau
- Univ. Grenoble Alpes, CNRS, Grenoble INP, 3SR, Grenoble, France
| | - A. Aliseda
- Dpt. of Mechanical Engineering, University of Washington, Seattle, WA, USA
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11
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Ivankovic T, Rolland du Roscoat S, Geindreau C, Séchet P, Huang Z, Martins JMF. Development and evaluation of an experimental protocol for 3-D visualization and characterization of the structure of bacterial biofilms in porous media using laboratory X-ray tomography. Biofouling 2016; 32:1235-1244. [PMID: 27827532 DOI: 10.1080/08927014.2016.1249865] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 10/14/2016] [Indexed: 06/06/2023]
Abstract
The development of a reliable model allowing accurate predictions of biofilm growth in porous media relies on a good knowledge of the temporal evolution of biofilm structure within the porous network. Since little is known about the real 3-D structure of biofilms in porous media, this work was aimed at developing a new experimental protocol to visualize the 3-D microstructure of the inside of a porous medium using laboratory X-ray microtomography. A reliable and reproducible methodology is proposed for (1) growing a biofilm inside a porous medium, and (2) X-ray tomography-based characterization of the temporal development of the biofilm at the inlet of the biofilter. The statistical analysis proposed here also validates the results presented in the literature based on a biofilm structure single measurement.
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Affiliation(s)
- Tomislav Ivankovic
- a Laboratoire 3SR , Université Grenoble-Alpes/CNRS/G-INP, UMR 5521 , Grenoble , France
- b Division of Microbiology, Department of Biology, Faculty of Science , University of Zagreb , Zagreb , Croatia
- c Laboratoire LEGI , Université Grenoble-Alpes/CNRS/G-INP, UMR 5519 , Grenoble , France
| | | | - Christian Geindreau
- a Laboratoire 3SR , Université Grenoble-Alpes/CNRS/G-INP, UMR 5521 , Grenoble , France
| | - Philipe Séchet
- c Laboratoire LEGI , Université Grenoble-Alpes/CNRS/G-INP, UMR 5519 , Grenoble , France
| | - Zhujun Huang
- c Laboratoire LEGI , Université Grenoble-Alpes/CNRS/G-INP, UMR 5519 , Grenoble , France
| | - Jean M F Martins
- d Laboratoire LTHE Université Grenoble-Alpes/CNRS/G-INP/IRD, UMR 5564 , Grenoble , France
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12
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Levitt MR, Barbour MC, Rolland du Roscoat S, Geindreau C, Chivukula VK, McGah PM, Nerva JD, Morton RP, Kim LJ, Aliseda A. Computational fluid dynamics of cerebral aneurysm coiling using high-resolution and high-energy synchrotron X-ray microtomography: comparison with the homogeneous porous medium approach. J Neurointerv Surg 2016; 9:0. [PMID: 27405312 DOI: 10.1136/neurintsurg-2016-012479] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 06/21/2016] [Accepted: 06/27/2016] [Indexed: 11/04/2022]
Abstract
BACKGROUND Computational modeling of intracranial aneurysms provides insights into the influence of hemodynamics on aneurysm growth, rupture, and treatment outcome. Standard modeling of coiled aneurysms simplifies the complex geometry of the coil mass into a homogeneous porous medium that fills the aneurysmal sac. We compare hemodynamics of coiled aneurysms modeled from high-resolution imaging with those from the same aneurysms modeled following the standard technique, in an effort to characterize sources of error from the simplified model. MATERIALS Physical models of two unruptured aneurysms were created using three-dimensional printing. The models were treated with coil embolization using the same coils as those used in actual patient treatment and then scanned by synchrotron X-ray microtomography to obtain high-resolution imaging of the coil mass. Computational modeling of each aneurysm was performed using patient-specific boundary conditions. The coils were modeled using the simplified porous medium or by incorporating the X-ray imaged coil surface, and the differences in hemodynamic variables were assessed. RESULTS X-ray microtomographic imaging of coils and incorporation into computational models were successful for both aneurysms. Porous medium calculations of coiled aneurysm hemodynamics overestimated intra-aneurysmal flow, underestimated oscillatory shear index and viscous dissipation, and over- or underpredicted wall shear stress (WSS) and WSS gradient compared with X-ray-based coiled computational fluid dynamics models. CONCLUSIONS Computational modeling of coiled intracranial aneurysms using the porous medium approach may inaccurately estimate key hemodynamic variables compared with models incorporating high-resolution synchrotron X-ray microtomographic imaging of complex aneurysm coil geometry.
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Affiliation(s)
- Michael R Levitt
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.,Department of Radiology, University of Washington, Seattle, Washington, USA.,Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - Michael C Barbour
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | | | - Christian Geindreau
- Laboratoire 3SR, UMR 5521, CNRS, Université Grenoble Alpes, Grenoble INP, Grenoble, France
| | - Venkat K Chivukula
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - Patrick M McGah
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - John D Nerva
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA
| | - Ryan P Morton
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA
| | - Louis J Kim
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.,Department of Radiology, University of Washington, Seattle, Washington, USA
| | - Alberto Aliseda
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA.,Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
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Perrin D, Badel P, Orgeas L, Geindreau C, du Roscoat SR, Albertini JN, Avril S. Patient-specific simulation of endovascular repair surgery with tortuous aneurysms requiring flexible stent-grafts. J Mech Behav Biomed Mater 2016; 63:86-99. [PMID: 27344232 DOI: 10.1016/j.jmbbm.2016.06.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 05/10/2016] [Accepted: 06/11/2016] [Indexed: 10/21/2022]
Abstract
The rate of post-operative complications is the main drawback of endovascular repair, a technique used to treat abdominal aortic aneurysms. Complex anatomies, featuring short aortic necks and high vessel tortuosity for instance, have been proved likely prone to these complications. In this context, practitioners could benefit, at the preoperative planning stage, from a tool able to predict the post-operative position of the stent-graft, to validate their stent-graft sizing and anticipate potential complications. In consequence, the aim of this work is to prove the ability of a numerical simulation methodology to reproduce accurately the shapes of stent-grafts, with a challenging design, deployed inside tortuous aortic aneurysms. Stent-graft module samples were scanned by X-ray microtomography and subjected to mechanical tests to generate finite-element models. Two EVAR clinical cases were numerically reproduced by simulating stent-graft models deployment inside the tortuous arterial model generated from patient pre-operative scan. In the same manner, an in vitro stent-graft deployment in a rigid polymer phantom, generated by extracting the arterial geometry from the preoperative scan of a patient, was simulated to assess the influence of biomechanical environment unknowns in the in vivo case. Results were validated by comparing stent positions on simulations and post-operative scans. In all cases, simulation predicted stents deployed locations and shapes with an accuracy of a few millimetres. The good results obtained in the in vitro case validated the ability of the methodology to simulate stent-graft deployment in very tortuous arteries and led to think proper modelling of biomechanical environment could reduce the few local discrepancies found in the in vivo case. In conclusion, this study proved that our methodology can achieve accurate simulation of stent-graft deployed shape even in tortuous patient specific aortic aneurysms and may be potentially helpful to help practitioners plan their intervention.
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Affiliation(s)
- David Perrin
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, SAINBIOSE, F-42023 Saint-Etienne, France; CNRS, 3SR Lab, F-38000 Grenoble, France; Univ. Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France; INSERM U1059, SAINBIOSE, F-42023 Saint-Etienne, France; Université de Lyon, F-69000 Lyon, France
| | - Pierre Badel
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, SAINBIOSE, F-42023 Saint-Etienne, France; INSERM U1059, SAINBIOSE, F-42023 Saint-Etienne, France; Université de Lyon, F-69000 Lyon, France
| | - Laurent Orgeas
- CNRS, 3SR Lab, F-38000 Grenoble, France; Univ. Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France
| | - Christian Geindreau
- CNRS, 3SR Lab, F-38000 Grenoble, France; Univ. Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France
| | | | - Jean-Noël Albertini
- INSERM U1059, SAINBIOSE, F-42023 Saint-Etienne, France; Université de Lyon, F-69000 Lyon, France; CHU Hôpital Nord Saint-Etienne, Department of CardioVascular Surgery, Saint-Etienne F-42055, France
| | - Stéphane Avril
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, SAINBIOSE, F-42023 Saint-Etienne, France; INSERM U1059, SAINBIOSE, F-42023 Saint-Etienne, France; Université de Lyon, F-69000 Lyon, France.
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14
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Perrin D, Badel P, Orgéas L, Geindreau C, Dumenil A, Albertini JN, Avril S. Patient-specific numerical simulation of stent-graft deployment: Validation on three clinical cases. J Biomech 2015; 48:1868-75. [PMID: 25979382 DOI: 10.1016/j.jbiomech.2015.04.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 02/25/2015] [Accepted: 04/23/2015] [Indexed: 11/17/2022]
Abstract
Endovascular repair of abdominal aortic aneurysms faces some adverse outcomes, such as kinks or endoleaks related to incomplete stent apposition, which are difficult to predict and which restrain its use although it is less invasive than open surgery. Finite element simulations could help to predict and anticipate possible complications biomechanically induced, thus enhancing practitioners' stent-graft sizing and surgery planning, and giving indications on patient eligibility to endovascular repair. The purpose of this work is therefore to develop a new numerical methodology to predict stent-graft final deployed shapes after surgery. The simulation process was applied on three clinical cases, using preoperative scans to generate patient-specific vessel models. The marketed devices deployed during the surgery, consisting of a main body and one or more iliac limbs or extensions, were modeled and their deployment inside the corresponding patient aneurysm was simulated. The numerical results were compared to the actual deployed geometry of the stent-grafts after surgery that was extracted from postoperative scans. We observed relevant matching between simulated and actual deployed stent-graft geometries, especially for proximal and distal stents outside the aneurysm sac which are particularly important for practitioners. Stent locations along the vessel centerlines in the three simulations were always within a few millimeters to actual stents locations. This good agreement between numerical results and clinical cases makes finite element simulation very promising for preoperative planning of endovascular repair.
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Affiliation(s)
- David Perrin
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, CNRS: UMR5307, LGF, F-42023 Saint-Etienne, France; CNRS, 3SR Lab, F-38000 Grenoble, France; Université Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France
| | - Pierre Badel
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, CNRS: UMR5307, LGF, F-42023 Saint-Etienne, France
| | - Laurent Orgéas
- CNRS, 3SR Lab, F-38000 Grenoble, France; Université Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France
| | - Christian Geindreau
- CNRS, 3SR Lab, F-38000 Grenoble, France; Université Grenoble Alpes, 3SR Lab, F-38000 Grenoble, France
| | - Aurélien Dumenil
- INSERM, U1099, F-35000 Rennes, France; Université de Rennes 1, LTSI, F-35000 Rennes, France; Therenva, F-35000 Rennes, France
| | - Jean-Noël Albertini
- CHU Hôpital Nord Saint-Etienne, Department of CardioVascular Surgery, Saint-Etienne F-42055, France; Université Jean Monnet, GRT EA 3065, Saint-Etienne F-42023, France
| | - Stéphane Avril
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, CNRS: UMR5307, LGF, F-42023 Saint-Etienne, France.
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Perrin D, Demanget N, Badel P, Avril S, Orgéas L, Geindreau C, Albertini JN. Deployment of stent grafts in curved aneurysmal arteries: toward a predictive numerical tool. Int J Numer Method Biomed Eng 2015; 31:e02698. [PMID: 25399927 DOI: 10.1002/cnm.2698] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 10/16/2014] [Accepted: 11/10/2014] [Indexed: 06/04/2023]
Abstract
The mechanical behavior of aortic stent grafts plays an important role in the success of endovascular surgery for aneurysms. In this study, finite element analysis was carried out to simulate the expansion of five marketed stent graft iliac limbs and to evaluate quantitatively their mechanical performances. The deployment was modeled in a simplified manner according to the following steps: (i) stent graft crimping and insertion in the delivery sheath, (ii) removal of the sheath and stent graft deployment in the aneurysm, and (iii) application of arterial pressure. In the most curved aneurysm and for some devices, a decrease of stent graft cross-sectional area up to 57% was found at the location of some kinks. Apposition defects onto the arterial wall were also clearly evidenced and quantified. Aneurysm inner curve presented significantly more apposition defects than outer curve. The feasibility of finite element analysis to simulate deployment of marketed stent grafts in curved aneurysm models was demonstrated. The study of the influence of aneurysm tortuosity on stent graft mechanical behavior shows that increasing vessel curvature leads to stent graft kinks and inadequate apposition against the arterial wall. Such simulation approach opens a very promising way toward surgical planning tools able to predict intra and/or post-operative short-term stent graft complications.
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Affiliation(s)
- David Perrin
- Ecole Nationale Supérieure des Mines de Saint-Etienne, CIS-EMSE, CNRS:UMR5307, LGF, F-42023, Saint Etienne, France; CNRS, 3SR Lab, F-38000, Grenoble, France; Univ. Grenoble Alpes, 3SR Lab, F-38000, Grenoble, France
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16
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Laurent CP, Latil P, Durville D, Rahouadj R, Geindreau C, Orgéas L, Ganghoffer JF. Mechanical behaviour of a fibrous scaffold for ligament tissue engineering: Finite elements analysis vs. X-ray tomography imaging. J Mech Behav Biomed Mater 2014; 40:222-233. [DOI: 10.1016/j.jmbbm.2014.09.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 08/25/2014] [Accepted: 09/02/2014] [Indexed: 11/30/2022]
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Macek Jilkova Z, Lisowska J, Manet S, Verdier C, Deplano V, Geindreau C, Faurobert E, Albigès-Rizo C, Duperray A. CCM proteins control endothelial β1 integrin dependent response to shear stress. Biol Open 2014; 3:1228-35. [PMID: 25432514 PMCID: PMC4265761 DOI: 10.1242/bio.201410132] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Hemodynamic shear stress from blood flow on the endothelium critically regulates vascular function in many physiological and pathological situations. Endothelial cells adapt to shear stress by remodeling their cytoskeletal components and subsequently by changing their shape and orientation. We demonstrate that β1 integrin activation is critically controlled during the mechanoresponse of endothelial cells to shear stress. Indeed, we show that overexpression of the CCM complex, an inhibitor of β1 integrin activation, blocks endothelial actin rearrangement and cell reorientation in response to shear stress similarly to β1 integrin silencing. Conversely, depletion of CCM2 protein leads to an elongated “shear-stress-like” phenotype even in the absence of flow. Taken together, our findings reveal the existence of a balance between positive extracellular and negative intracellular signals, i.e. shear stress and CCM complex, for the control of β1 integrin activation and subsequent adaptation of vascular endothelial cells to mechanostimulation by fluid shear stress.
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Affiliation(s)
- Zuzana Macek Jilkova
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France
| | - Justyna Lisowska
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France CNRS ERL 5284, F-38042 Grenoble, France
| | - Sandra Manet
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France CNRS ERL 5284, F-38042 Grenoble, France
| | - Claude Verdier
- CNRS/Université Grenoble 1, LIPhy, UMR 5588, F-38041 Grenoble, France
| | - Valerie Deplano
- Aix-Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, F-13384, Marseille, France
| | - Christian Geindreau
- CNRS UMR5521, 3SR, Université Joseph Fourier Grenoble-INP, Grenoble, F-38042, France
| | - Eva Faurobert
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France CNRS ERL 5284, F-38042 Grenoble, France
| | - Corinne Albigès-Rizo
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France CNRS ERL 5284, F-38042 Grenoble, France
| | - Alain Duperray
- INSERM, Institut Albert Bonniot, F-38000 Grenoble, France Université Grenoble Alpes, Institut Albert Bonniot, F-38000 Grenoble, France
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18
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Affiliation(s)
- Neige Calonne
- Météo-France
− CNRS, CNRM-GAME UMR 3589, CEN, F-38400 Saint Martin d’Hères, France
- 3SR, Université Grenoble Alpes, F-38000 Grenoble, France
- 3SR, CNRS, F-38000 Grenoble, France
| | - Christian Geindreau
- 3SR, Université Grenoble Alpes, F-38000 Grenoble, France
- 3SR, CNRS, F-38000 Grenoble, France
| | - Frédéric Flin
- Météo-France
− CNRS, CNRM-GAME UMR 3589, CEN, F-38400 Saint Martin d’Hères, France
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Macek Jilkova Z, Deplano V, Verdier C, Toungara M, Geindreau C, Duperray A. Wall shear stress and endothelial cells dysfunction in the context of abdominal aortic aneurysms. Comput Methods Biomech Biomed Engin 2014; 16 Suppl 1:27-9. [PMID: 23923836 DOI: 10.1080/10255842.2013.815959] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Toungara M, Orgéas L, Geindreau C, Bailly L. Micromechanical modelling of the arterial wall: influence of mechanical heterogeneities on the wall stress distribution and the peak wall stress. Comput Methods Biomech Biomed Engin 2014; 16 Suppl 1:22-4. [PMID: 23923834 DOI: 10.1080/10255842.2013.815929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- M Toungara
- CNRS, University of Grenoble, Laboratoire 3SR, BP 53, 38041 Grenoble Cedex 9, France.
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Rolland du Roscoat S, Martins J, Séchet P, Vince E, Latil P, Geindreau C. Application of synchrotron X-ray microtomography for visualizing bacterial biofilms 3D microstructure in porous media. Biotechnol Bioeng 2013; 111:1265-71. [DOI: 10.1002/bit.25168] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/25/2013] [Accepted: 11/26/2013] [Indexed: 11/11/2022]
Affiliation(s)
- S. Rolland du Roscoat
- Laboratoire 3SR; UMR CNRS 5521; Université Joseph Fourier de Grenoble; Grenoble-INP; Domaine Universitaire, BP53 38041 Grenoble Cedex 9 France
- European Synchrotron Radiation Facility; ID 19, BP 220 38043 Grenoble Cedex 9 France
| | - J.M.F. Martins
- Laboratoire d'Etudes des Transferts en Hydrologie et Environnement (LTHE); UMR 5564 CNRS- Université Joseph Fourier de Grenoble; Grenoble-INP; Grenoble Cedex 9 France
| | - P. Séchet
- Laboratoire des Ecoulements Géophysiques et Industriels (LEGI); UMR CNRS 5519; Université Joseph Fourier de Grenoble; Grenoble-INP; Grenoble Cedex 9 France
| | - E. Vince
- Laboratoire d'Etudes des Transferts en Hydrologie et Environnement (LTHE); UMR 5564 CNRS- Université Joseph Fourier de Grenoble; Grenoble-INP; Grenoble Cedex 9 France
| | - P. Latil
- Laboratoire 3SR; UMR CNRS 5521; Université Joseph Fourier de Grenoble; Grenoble-INP; Domaine Universitaire, BP53 38041 Grenoble Cedex 9 France
| | - C. Geindreau
- Laboratoire 3SR; UMR CNRS 5521; Université Joseph Fourier de Grenoble; Grenoble-INP; Domaine Universitaire, BP53 38041 Grenoble Cedex 9 France
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Demanget N, Duprey A, Badel P, Orgéas L, Avril S, Geindreau C, Albertini JN, Favre JP. Finite element analysis of the mechanical performances of 8 marketed aortic stent-grafts. J Endovasc Ther 2013; 20:523-35. [PMID: 23914862 DOI: 10.1583/12-4063.1] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE To assess numerically the flexibility and mechanical stresses undergone by stents and fabric of currently manufactured stent-grafts. METHODS Eight marketed stent-graft limbs (Aorfix, Anaconda, Endurant, Excluder, Talent, Zenith Flex, Zenith LP, and Zenith Spiral-Z) were modeled using finite element analysis. A numerical benchmark combining bending up to 180° and pressurization at 150 mmHg of the stent-grafts was performed. Stent-graft flexibility, assessed by the calculation of the luminal reduction rate, maximal stresses in stents, and maximal strains in fabric were assessed. RESULTS The luminal reduction rate at 90° was <20% except for the Talent stent-graft. The rate at 180° was higher for Z-stented models (Talent, Endurant, Zenith, and Zenith LP; range 39%-78%) than spiral (Aorfix, Excluder, and Zenith Spiral-Z) or circular-stented (Anaconda) devices (range 14%-26%). At 180°, maximal stress was higher for Z-stented stent-grafts (range 370-622 MPa) than spiral or circular-stented endografts (range 177-368 MPa). At 90° and 180°, strains in fabric were low and did not differ significantly among the polyester stent-grafts (range 0.5%-7%), while the expanded polytetrafluoroethylene fabric of the Excluder stent-graft underwent higher strains (range 11%-18%). CONCLUSION Stent design strongly influences mechanical performances of aortic stent-grafts. Spiral and circular stents provide greater flexibility, as well as lower stress values than Z-stents, and thus better durability.
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Lemercier A, Bailly L, Geindreau C, Toungara M, Latil P, Orgéas L, Deplano V, Boucard N. Comparison between the mechanical behaviour of the human healthy AA and commercial prostheses under various mechanical loadings. Comput Methods Biomech Biomed Engin 2013; 16 Suppl 1:315-7. [DOI: 10.1080/10255842.2013.815930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Demanget N, Badel P, Avril S, Orgéas L, Geindreau C, Albertini JN, Favre JP. MECHANICAL PERFORMANCES OF STENT-GRAFTS WITHIN TORTUOUS ABDOMINAL AORTIC ANEURYSMS. J Biomech 2012. [DOI: 10.1016/s0021-9290(12)70312-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Demanget N, Avril S, Badel P, Orgéas L, Geindreau C, Albertini JN, Favre JP. Computational comparison of the bending behavior of aortic stent-grafts. J Mech Behav Biomed Mater 2012; 5:272-82. [DOI: 10.1016/j.jmbbm.2011.09.006] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 09/09/2011] [Accepted: 09/12/2011] [Indexed: 11/16/2022]
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Boutin C, Geindreau C. Periodic homogenization and consistent estimates of transport parameters through sphere and polyhedron packings in the whole porosity range. Phys Rev E Stat Nonlin Soft Matter Phys 2010; 82:036313. [PMID: 21230177 DOI: 10.1103/physreve.82.036313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Indexed: 05/30/2023]
Abstract
This paper presents a study of transport parameters (diffusion, dynamic permeability, thermal permeability, trapping constant) of porous media by combining the homogenization of periodic media (HPM) and the self-consistent scheme (SCM) based on a bicomposite spherical pattern. The link between the HPM and SCM approaches is first established by using a systematic argument independent of the problem under consideration. It is shown that the periodicity condition can be replaced by zero flux and energy through the whole surface of the representative elementary volume. Consequently the SCM solution can be considered as a geometrical approximation of the local problem derived through HPM for materials such that the morphology of the period is "close" to the SCM pattern. These results are then applied to derive the estimates of the effective diffusion, the dynamic permeability, the thermal permeability and the trapping constant of porous media. These SCM estimates are compared with numerical HPM results obtained on periodic arrays of spheres and polyhedrons. It is shown that SCM estimates provide good analytical approximations of the effective parameters for periodic packings of spheres at porosities larger than 0.6, while the agreement is excellent for periodic packings of polyhedrons in the whole range of porosity.
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Affiliation(s)
- Claude Boutin
- Université de Lyon-Ecole Nationale des Travaux Publics de l'Etat-LGM/DGCB, CNRS, 3237 Rue Maurice Audin, 69518 Vaulx-en-Velin, France.
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Abstract
This paper presents a study of dynamic permeability of porous media combining homogenization of periodic media (HPM) and the self-consistent method (SCM). By taking advantage of the physical principles identified with HPM, the application of SCM leads to the determination of two physically admissible dynamic permeability assessments, both different from that given by the cell model. A comparison with numerical modeling demonstrates the fairly good reliability of the three estimates for granular media consisting of a periodic array of spherical grains. Furthermore, the self-consistent values enable exact bounds for the dynamic permeability of a wide class of porous media to be derived with a clear identification of their microstructure (grain and fluid size distribution).
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Affiliation(s)
- Claude Boutin
- Laboratoire Geomateriaux, DGCB-URA CNRS 1652, Ecole Nationale des Travaux Publics de l'Etat, Universite de Lyon, 69518 Vaulx-en-Velin Cedex, France.
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Orgéas L, Idris Z, Geindreau C, Bloch JF, Auriault JL. Modelling the flow of power-law fluids through anisotropic porous media at low-pore Reynolds number. Chem Eng Sci 2006. [DOI: 10.1016/j.ces.2006.01.046] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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30
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