| Citation: | Zhang Tianyi, Hao Shixi, Zhao Ming, et al. Coupled two-phase flow solver based on entropy viscosity within DGSEM framework[J]. Journal of Aerospace Power, 2026, 41（8）：20250022 doi: 10.13224/j.cnki.jasp.20250022
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To deal with the issues of accuracy degradation and Gibbs phenomena caused by discontinuities such as shock waves, contact discontinuities, and free interfaces in the numerical simulation of compressible two-phase flows, a coupled solution method was developed based on the discontinuous Galerkin spectral element method (DGSEM) framework. To address the issue of discontinuities in single phase, an entropy viscosity model that can automatically distinguish shocks from contact discontinuities and adaptively add artificial viscosity was introduced. The solution method was also coupled with the level-set method, which was discretized by the DGSEM framework and combined with the ghost fluid approach to accurately track the material interface and solve the flow field simultaneously. Numerical results showed that this method can achieve the designed accuracy in smooth regions. Compared with the variable-step artificial viscosity and the fifth-order weighted essentially non-oscillatory-Z (WENO-Z) scheme, it reduced over-dissipation and obtained more flow-field details. Compared with calculations using the same discontinuous Galerkin method but with dissipative interface models, this method reduced the error at monitoring points by up to 6.4% compared with experimental results when using only one-fourth of the grid density. This proved that the method can effectively improve the accuracy of discontinuity capture and material interface tracking.
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