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arXiv 2301.04568math.NAcs.NA
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计算流体动力学中能量与熵稳定初边值问题的非线性边界条件

Nonlinear Boundary Conditions for Energy and Entropy Stable Initial Boundary Value Problems in Computational Fluid Dynamics

Jan Nordström

AI总结:

针对非线性双曲初边值问题,提出可保证能量与熵有界的边界条件及实现流程,并将其用于浅水、不可压缩和可压缩 Euler 方程,证明 SBP 格式弱施加边界时可获得能量与熵稳定离散近似。

摘要:

我们推导了用于非线性初边值问题的新型边界条件及实现流程,这些条件可产生能量和熵有界的解。文中给出了针对斜对称形式一般非线性双曲问题的逐步处理流程。随后,该流程被应用于计算流体动力学中三个最重要的方程:浅水方程、不可压缩与可压缩 Euler 方程。文中讨论了非线性边界条件的强施加与弱施加方式。基于连续分析,我们表明:若数值格式采用 summation-by-parts(分部求和)形式,并结合边界条件的弱实现,则这种新的非线性边界流程可得到能量稳定且熵稳定的离散近似。

英文摘要:

We derive new boundary conditions and implementation procedures for nonlinear initial boundary value problems that lead to energy and entropy bounded solutions. A step-by-step procedure for general nonlinear hyperbolic problems on skew-symmetric form is presented. That procedure is subsequently applied to the three most important equations in computational fluid dynamics: the shallow water equations and the incompressible and compressible Euler equations. Both strong and weak imposition of the nonlinear boundary conditions are discussed. Based on the continuous analysis, we show that the new nonlinear boundary procedure lead to energy and entropy stable discrete approximations if the scheme is formulated on summation-by-parts form in combination with a weak implementation of the boundary conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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