论文部分内容阅读
针对气动热数值模拟中壁面热流后处理方法进行了系统的数值研究,提出了一种有别于常规微分法和积分法的壁面热流后处理方法.通过3种算例进行了对比分析,结果表明:即使在流场参数相同情况下,采用不同的壁面热流后处理方法计算的热流结果也会有较大差异,且表现出不同的网格依赖性.微分法对网格的依赖性较大,单纯提高差分精度不一定能够减弱网格依赖性和提高计算精度,还与近壁处网格分布密切相关;积分法从能量平衡积分方程出发,极大地减弱了网格依赖性,具有较高的计算精度.所提出方法具有与积分法相当的网格依赖性和计算精度,尤其在驻点区域,其网格依赖性更弱于积分法,且计算简单,提高了计算效率.
A systematic numerical study of wall heat flux aftertreatment in aerodynamic heat numerical simulation is carried out and a new method of wall heat flux aftertreatment is proposed, which is different from conventional differential method and integral method. Comparing the three examples, the results show that : Even with the same flow field parameters, the results of heat flow calculated by different wall heat flux post-treatment methods will have great differences and show different grid dependencies.Differential method is more dependent on the grid, Simply improve the differential accuracy may not be able to reduce the grid dependence and improve the accuracy of calculation, but also closely related with the grid near the wall distribution; integration method from the energy balance integral equation, greatly reduced grid dependence, with high The proposed method has the same grid dependency and accuracy as the integral method, especially in the stagnation point area, the grid dependence is weaker than the integral method, and the calculation is simple and the computational efficiency is improved.