arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.04508physics.flu-dyn
收藏

格子玻尔兹曼方法中的多相弯曲边界条件

Multiphase curved boundary condition in lattice Boltzmann method

Yichen Yao, Yangsha Liu, Xingguo Zhong, Binghai Wen

摘要:

边界处理是模拟流体流动的基础;特别是在格子玻尔兹曼方法中,弯曲边界条件有效地提高了具有复杂几何边界的单相模拟的精度。然而,传统的弯曲边界条件通常会导致显着的质量泄漏或增加时,他们直接用于多相流模拟。我们发现主要原因是曲边条件中没有考虑非理想效应,其次是计算误差。本文将非理想效应引入到线性插值格式中,并对插值误差进行补偿,提出了一种多相曲线边界条件来处理具有复杂几何形状的润湿边界。一系列大密度比下的静态和动态多相流模拟验证了该格式的准确性和质量守恒性。

英文摘要:

The boundary treatment is fundamental for modeling fluid flows; especially, in the lattice Boltzmann method, the curved boundary conditions effectively improve the accuracy of single-phase simulations with complex-geometry boundaries. However, the conventional curved boundary conditions usually cause dramatic mass leakage or increase when they are directly used for multiphase flow simulations. We find that the principal reason is the absence of nonideal effect in the curved boundary conditions, followed by the calculation error. In this paper, incorporating the nonideal effect into the linear interpolation scheme and compensating for the interpolating error, we propose a multiphase curved boundary condition to treat the wetting boundaries with complex geometries. A series of static and dynamic multiphase simulations with large density ratio verify that the present scheme is accurate and ensures mass conservation.

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。

↑