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一种可压缩流IB方法及其在气体动理论格式中的应用
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摘要
本文提出一种浸入边界法(immersed-boundary method,IB方法)并将其应用于气体动理论格式(gas-kinetic scheme,GKS)中,对含静止/移动边界的不可压/可压粘性流动问题进行模拟。本文采用了影单元来施加边界条件,并提出一种"当地边界定义"的思路来确定影单元,使得同一影单元对不同边界可以有不同的构造方式,从而消除影单元的奇异性问题。此外,本文使用了简单的时间外推来解决"fresh-cell"问题。算例方面,本方法首先应用于GKS中进行Taylor-Couette流动模拟,验证了方法的二阶精度。之后,本文进行了运动翼型绕流的模拟,验证了方法的有效性。
An immersed-boundary(IB) method is proposed and applied in the gas-kinetic BGK scheme to simulate incompressible/compressible viscous flow with stationary/moving boundary. In present method the ghost-cell technique is adopted to fulfill the boundary condition on the immersed boundary. A novel idea "local boundary determination" is put forward to identify the ghost cells, each of which may have several different ghost-cell constructions corresponding to different boundary segments, thus eliminating the singularity of the ghost cell. Furthermore, the so-called "fresh-cell" problem when implementing the IB method in moving-boundary simulation is resolved by a simple extrapolation in time. The method is firstly applied in the gas-kinetic BGK scheme to simulate the Taylor-Couette flow, where the second-order spatial accuracy of the method is validated. Then the test case of compressible flow around a moving airfoil is conducted to verify the capability of the present method in simulating compressible flow and handling the moving boundary.
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