一种用于绕移动障碍物稀薄流模拟的笛卡尔切割单元方法
A Cartesian Cut Cell Method for Rarefied Flow Simulations around Moving Obstacles
AI总结：
本文提出一种笛卡尔网格上的切割单元方法，用于准确模拟绕移动障碍物的稀薄气体流，通过统一算法处理笛卡尔单元和各类切割单元，简化实现并支持三维扩展。
摘要：
为了准确模拟绕移动障碍物的稀薄气体流，我们提出了一种笛卡尔网格上的切割单元方法：它允许精确守恒并准确处理边界条件。我们的方法设计用于通过同一算法处理笛卡尔单元和各种类型的切割单元，无需识别每个切割单元的具体形状。这使实现变得非常简单，并允许直接扩展到三维问题。此类模拟也得益于使用自适应网格细化技术和混合并行实现。通过几个测试案例进行了说明，包括Crookes辐射计的三维非稳态模拟。
英文摘要：
For accurate simulations of rarefied gas flows around moving obstacles, we propose a cut cell method on Cartesian grids: it allows exact conservation and accurate treatment of boundary conditions. Our approach is designed to treat Cartesian cells and various kind of cut cells by the same algorithm, with no need to identify the specific shape of each cut cell. This makes the implementation quite simple, and allows a direct extension to 3D problems. Such simulations are also made possible by using an adaptive mesh refinement technique and a hybrid parallel implementation. This is illustrated by several test cases, including a 3D unsteady simulation of the Crookes radiometer.
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