气动热数值模拟中壁面热流后处理方法

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.

Post-processing methods for wall heat-flux in aeroheating numerical simulation

A systematic study of post-processing methods for wall heat-flux in aeroheating numerical simulation was conducted and a post-processing method differing from conventional differential or integral methods was proposed. The comparisons among different post-processing methods were done by three cases. The results indicate that, even if the flow parameters remain the same, significant differences and grid-dependence in wall heat-flux prediction are observed using different post-processing methods. The differential method depends strongly on the grid used in calculations. Enhancement of the order of finite difference cannot always weaken its grid-dependence and improve its accuracy in wall heat-flux prediction, which is also related closely to the grid distribution near the wall. The integral method derived directly from the integral energy balance equation can significantly achieve a lower grid-dependence and thus a high accuracy. The proposed method can be compared with the integral method in the aspect of grid-dependence and accuracy. Especially, in the stagnation region, it has even weaker gird-dependence. Moreover, it is simpler and easier to be implemented numerically, thus further improving the computation efficiency.