壁判据检验激波/层流边界层干扰流动的数值计算

针对二维激波/层流边界层干扰流动数值计算结果的可信度问题,根据高智研究员提出的壁判据对数值计算结果进行了分析和可信度评估.对于二维可压流动,在壁面附近,已经证明壁判据与NS方程解析解相吻合,数值计算结果也表明达到了网格无关性,而利用Opencfd算出的数值解却发现:随着网格的逐渐加密,切向动量壁判据和能量壁判据吻和得越来越好,而法向动量壁判据仍然有较小的差距,但并不影响流场的结果,其原因是壁面压力边界条件选取不当.数值计算结果表明,壁判据可以作为含壁面流动的一种CFD计算结果可信度评估的工具,具体的评估标准仍需进一步研究.

Wall-Surface Criteria and its Application to Verify Computations of Shock Wave/Laminar Boundary Layer

To verify and confirm the credibility of the numerical results of two-dimensional shock wave/laminar boundary layer interaction,the credibility of numerical results was evaluated using wall-surface criteria. It is proved that, for 2D compressed flow, the wall-surface criteria matches analytical solution of NS equation near the wall. While it is found that the solution of numerical simulation using OpenCFD meet wall-surface tangential momentum criterion and energy criterion better with the more fine grids, but does not meet wall-surface normal momentum criterion because of the ill-suited wall pressure boundary condition. It shows that wall-surface criteria might be a kind of method to verify the CFD numerical computations of near-wall flows and the criteria standard should be studied further.