凹坑局部干扰热环境数值模拟研究

通过求解雷诺平均N-S方程,采用NND格式和SST两方程湍流模型,对开/闭式凹坑二维和三维流动情况进行了模拟,得到了凹坑局部压力和热流的分布,并与试验结果进行了比较。计算结果表明,凹坑局部峰值压力和热流均出现在后沿附近,且闭式凹坑局部热流较开式凹坑更为严重;在三维流动情况下,由于侧壁的影响,开式凹坑峰值热流沿后沿展向变化较小,而闭式凹坑峰值热流会离开后沿中心而出现在后沿靠近侧壁的区域。

Numerical research on local heat flux of cavities

The local heatflux of open/closed cavity in 2D and 3D flows were simulated numerically by solving Navier-Stokes equations using NND scheme and SST turbulent model.The distribution of pressure and heatflux were compared with the experimental data.The calculation results indicate that the peak value of pressure and heatflux appear on the rear of cavity,the local heatflux of closed cavity is more severe than open cavity,and in the 3D flows,where the peak value of closed cavity appears on the area of rear which is near the side wall.