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arXiv 2204.09587math.AP
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具有漫反射边界条件的通道中玻尔兹曼方程的热传导问题

Heat transfer problem for the Boltzmann equation in a channel with diffusive boundary condition

Renjun Duan, Shuangqian Liu, Tong Yang, Zhu Zhang

AI总结:

本文研究通道中一维稳态玻尔兹曼流的热传导问题,通过形式渐近分析和一致的 L∞ 估计,严格推导出带温度跳跃的可压缩 Navier-Stokes 滑移边界条件。

摘要:

本文研究通道中的一维稳态玻尔兹曼流。假设通道壁速度为零,并给定温度 $θ_0$ 和 $θ_1$。Esposito 等人 [13,14] 曾研究过该问题,他们证明解趋向于一个局部麦克斯韦分布,其参数满足带无滑移边界条件的可压缩 Navier-Stokes 方程。然而,大量数值实验表明,流体层并未完全粘附于边界。在克努森数相当小的区域中,滑移现象在边界附近十分显著。因此,我们重新审视该问题,并考虑滑移边界条件。按照文献 [9] 的思路,我们首先进行形式渐近分析,以表明由玻尔兹曼方程控制的流动可被精确近似为一个具有温度跳跃条件的稳态 CNS 方程与位于端点的两个克努森层的叠加。随后,我们将对余项建立一致的 $L^\infty$ 估计,并严格推导出可压缩 Navier-Stokes 方程的滑移边界条件。

英文摘要:

In this paper, we study the 1D steady Boltzmann flow in a channel. The walls of the channel are assumed to have vanishing velocity and given temperatures $θ_0$ and $θ_1$. This problem was studied by Esposito et al [13,14] where they showed that the solution tends to a local Maxwellian with parameters satisfying the compressible Navier-Stokes equation with no-slip boundary condition. However, a lot of numerical experiments reveal that the fluid layer does not entirely stick to the boundary. In the regime where the Knudsen number is reasonably small, the slip phenomenon is significant near the boundary. Thus, we revisit this problem by taking into account the slip boundary conditions. Following the lines of [9], we will first give a formal asymptotic analysis to see that the flow governed by the Boltzmann equation is accurately approximated by a superposition of a steady CNS equation with a temperature jump condition and two Knudsen layers located at end points. Then we will establish a uniform $L^\infty$ estimate on the remainder and derive the slip boundary condition for compressible Navier-Stokes equations rigorously.

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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