一种混合格式的构建及其在多尺度流动中的应用  

A New Numerical Scheme and Its Application in Multi-Scale Flow

作　　者：潘宏禄[1] 李俊红[1] 沈清[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《推进技术》2015年第12期1774-1780,共7页Journal of Propulsion Technology

基　　金：国家自然基金(1102199;11402254)

摘　　要：面向非定常湍流数值模拟方法精度提升问题,构建了实用的矢通量分裂(FVS)形式高阶精度混合格式。该格式平滑区具有五阶精度线性紧致格式的高分辨率特证,而强间断和强梯度区呈二阶耗散型格式特征,进而保证全流场计算的稳定性。基于所建立的混合格式开展有限体积大涡模拟(LES)计算,将其应用于三维高Reynolds数非定常湍流预测中。结果显示,所建立的数值格式能够可靠预测湍流多尺度涡结构特征,且计算量小,具有较高分辨率和鲁棒性。A mixed scheme of flux vector splitting（FVS） was constructed to increase precision of the simulation method on turbulence complex multi-scale flows. The scheme is of high order resolution characteristics similar to 5th order compact scheme in smooth region,with 2nd order precision in local discontinue and strong gradient region to stabilize the flow field simulation. The present method was applied to finite volume large eddy simulation（LES）,and the study on three dimensional（3D） high Reynolds number unsteady flows was carried out. The results reveal that the present scheme constructed here is of high resolution and robustness with low computational cost and is able to predict complex multi-scale flows vortex reliably.

关 键 词：多尺度流动 大涡模拟 数值模拟 高阶格式 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]