法向网格增长比对双椭球气动热数值模拟的影响

Influence of the Growth Ratio of Normal Grid on the Aerodynamic Thermal Simulation of Double Ellipsoid

针对高超声速气动热数值模拟的网格尺度问题,以双椭球外形为研究对象,开展了法向网格增长比对热环境计算结果影响的研究。结果表明:法向网格增长比不宜过大,否则流场结构会发生改变,导致热流计算结果不准确。基于MOE方法将计算热流值进行插值处理获得了热流"精确值",并以该值为参考量化了法向网格增长比的网格无关范围,当法向网格增长比控制在1.02~1.21时,热流计算结果对网格的依赖性较小。计算热流值与试验值对比良好,有较高可信度。

Aiming at the grid scale problem of hypersonic aerodynamic thermal simulation,the influence of the normal grid growth ratio on the results of thermal environment calculation was studied.The results show that the normal grid growth ratio should not be too large,otherwise the structure of the flow field will change,resulting in inaccurate heat flux calculation results.The grid independent range of normal grid growth rate was quantified via using the“exact value”which was calculated by MOE interpolation method.When the growth rate of normal grid is controlled between 1.02 and 1.21,the results of heat flux calculation are less dependent on the grid.At the same time,the calculated heat flux value is well compared with the experimental value and has high reliability.