细长体大攻角绕流的数值模拟

ANUMERICAL SIMRLATION OF VISCOUS FLOW OVER A HEMISPHERE CYLINDER

用数值模拟方法研究了细长体大攻角的绕流特性（求解在周向３６０°范围内进行）。数值模拟的出发方程是三维可压流的全Ｎ－Ｓ方程，格式为二阶迎风ＴＶＤ格式。通过数值模拟研究了附近，攻角１９°、３２．５°和５０°状态下，细长体绕流场中的激波、分离流动及表面压力分布等重要特征。

eparated and vortical flow around a hemisphere cylinder is studied by numerical simulation(computational range includes 360 degrees in the circumferential direction around the body).The implicit TVD(total variation diminishing)algorithm is used to solve the foll Navier-Stokes equations.The numerical simulation is performed at angles of atlack up to 50 de-grees under the transonic flow condition,In analyzing the complicated flow structure,some ex-perimental data and topological concepts or simulated oil flow patterns are used to understand the separation better.