Reducing Entropy Production in a Lagrangian Method

doi:10.19596/j.cnki.1001-246x.8384

Abstract

Abstract:

We investigate entropy production in a cell centered Lagrangian method. The motivation is to reduce intrinsic entropy dissipation of a Godunov method in calculating isentropic flow problems. By implementing pressure modification to the original scheme, a flux fix approach is proposed based on the fully discrete entropy inequality. Numerical experiments show that for problems with expansion waves the modified flux algorithm has better solution behaviors than the original Lagrangian method.

Key words: Godunov methods, Riemann solver, rarefaction wave, entropy

Liji WANG, Hongping GUO, Zhijun SHEN. Reducing Entropy Production in a Lagrangian Method[J]. Chinese Journal of Computational Physics, 2022, 39(2): 179-190.

Figures/Tables 9

References 18

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