تقرير
A kinetic scheme with variable velocities and relative entropy
العنوان: | A kinetic scheme with variable velocities and relative entropy |
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المؤلفون: | Roy, Shashi Shekhar, Rao, S. V. Raghurama |
سنة النشر: | 2023 |
المجموعة: | Physics (Other) |
مصطلحات موضوعية: | Physics - Fluid Dynamics, Physics - Computational Physics |
الوصف: | A new kinetic model is proposed where the equilibrium distribution with bounded support has a range of velocities about two average velocities in 1D. In 2D, the equilibrium distribution function has a range of velocities about four average velocities, one in each quadrant. In the associated finite volume scheme, the average velocities are used to enforce the Rankine-Hugoniot jump conditions for the numerical diffusion at cell-interfaces, thereby capturing steady discontinuities exactly. The variable range of velocities is used to provide additional diffusion in smooth regions. Further, a novel kinetic theory based expression for relative entropy is presented which, along with an additional criterion, is used to identify expansions and smooth flow regions. Appropriate flow tangency and far-field boundary conditions are formulated for the proposed kinetic model. Several benchmark 1D and 2D compressible flow test cases are solved to demonstrate the efficacy of the proposed solver. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1016/j.compfluid.2023.106016 |
URL الوصول: | http://arxiv.org/abs/2304.02520 |
رقم الأكسشن: | edsarx.2304.02520 |
قاعدة البيانات: | arXiv |
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