非结构网格上N-S方程解法研究及在多段翼型绕流中的应用
Computation of the flow past multi-element airfoils using unstructured grid and N-S equations
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摘要: 在非结构网格上求解N-S方程时,靠近物面的网格伸展比相当大,用有限体积法进行显式求解时不易收敛并且对雷诺数有一定的限制。本文采用的人工耗散项中含有网格的方向尺度,因而在不同区域选取不同:在粘性区内该项比物理粘性项小得多,在粘性区外与Jameson的人工耗散项相同。生成非结构网格采用的是层推进技术与传统的阵面推进法相结合的方法,这样能保证在粘性区内网格有一定的方向规则,而在粘性区外网格完全非结构化。Abstract: When we solute the Navier-Stokes equations on unstructured triangular meshes, the meshes which are near to the wall have high-aspect-ratio, using the finite-volume approximation'method the integration to steady-state is difficult to achieve. In this paper