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Jiang S, Liu H, Huang X, Yu Z, Wang R, Shangguan Y. Improved die assembly for gas‐assisted sheet extrusion using different up and down gas layer thicknesses. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shiyu Jiang
- School of Mechatronics Engineering Nanchang University Nanchang China
| | - Hesheng Liu
- School of Mechatronics Engineering Nanchang University Nanchang China
- School of Chemical Biology and Materials East China University of Technology Nanchang China
| | - Xingyuan Huang
- School of Mechatronics Engineering Nanchang University Nanchang China
| | - Zhong Yu
- School of Mechatronics Engineering Nanchang University Nanchang China
- School of Physics and Electronic Information Shangrao Normal University Shangrao China
| | - Ruizhe Wang
- School of Mechatronics Engineering Nanchang University Nanchang China
| | - Yuanshuo Shangguan
- School of Physics and Electronic Information Shangrao Normal University Shangrao China
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Verification and Validation of openInjMoldSim, an Open-Source Solver to Model the Filling Stage of Thermoplastic Injection Molding. FLUIDS 2020. [DOI: 10.3390/fluids5020084] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the present study, the simulation of the three-dimensional (3D) non-isothermal, non-Newtonian fluid flow of polymer melts is investigated. In particular, the filling stage of thermoplastic injection molding is numerically studied with a solver implemented in the open-source computational library O p e n F O A M ® . The numerical method is based on a compressible two-phase flow model, developed following a cell-centered unstructured finite volume discretization scheme, combined with a volume-of-fluid (VOF) technique for the interface capturing. Additionally, the Cross-WLF (Williams–Landel–Ferry) model is used to characterize the rheological behavior of the polymer melts, and the modified Tait equation is used as the equation of state. To verify the numerical implementation, the code predictions are first compared with analytical solutions, for a Newtonian fluid flowing through a cylindrical channel. Subsequently, the melt filling process of a non-Newtonian fluid (Cross-WLF) in a rectangular cavity with a cylindrical insert and in a tensile test specimen are studied. The predicted melt flow front interface and fields (pressure, velocity, and temperature) contours are found to be in good agreement with the reference solutions, obtained with the proprietary software M o l d e x 3 D ® . Additionally, the computational effort, measured by the elapsed wall-time of the simulations, is analyzed for both the open-source and proprietary software, and both are found to be similar for the same level of accuracy, when the parallelization capabilities of O p e n F O A M ® are employed.
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