arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.10344math.APcs.NAmath.NA
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从矩系统构造Navier-Stokes方程的边界条件

Construction of boundary conditions for Navier-Stokes equations from the moment system

Ruo Li, Yichen Yang, Yizhou Zhou

AI总结:

本研究针对稀薄气体线性化矩系统,通过三尺度渐近展开分析边界层行为,提出匹配要求构造含二阶效应的Navier-Stokes方程边界条件,并经Couette流误差估计和数值测试验证有效性。

摘要:

本工作研究稀薄气体线性化矩系统的边界条件(BCs)。当Knudsen数足够小时,我们借助三尺度渐近展开分析矩系统的边界层行为。渐近分析将流动分解为外解、粘性层和Knudsen层。从矩系统的边界条件出发,我们提出匹配要求并构造Navier-Stokes方程的边界条件。所得边界条件包含二阶项对速度滑移和温度跳跃的影响。针对Couette流的示例情形,我们通过误差估计证明了所构造边界条件的有效性,同时通过数值测试展示了其性能。

英文摘要:

This work concerns with boundary conditions (BCs) of the linearized moment system for rarefied gases. As the Knudsen number is sufficiently small, we analyze the boundary-layer behaviors of the moment system by resorting to a three-scale asymptotic expansion. The asymptotic analysis casts the flows into the outer solution, the viscous layer and the Knudsen layer. Starting from the BCs of the moment system, we propose a matching requirement and construct BCs for the Navier-Stokes equations. The obtained BCs contain the effect of second-order terms on the velocity slip and temperature jump. For the illustrative case of the Couette flow, we prove the validity of the constructed BCs through the error estimates. Meanwhile, numerical tests are presented to show the performance of the constructed BCs.

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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