热流CFD计算中格式和网格效应若干问题研究

Scheme effect and grid dependency in CFD computations of heat transfer

通过数值实验、理论分析、试验数据和经验公式的综合研究,探讨了CFD热流计算的格式效应及网格效应:研究了Roe的FDS格式、Van Leer的FVS格式、AUSM+格式及中心差分格式的热流计算分辨率,探讨了不同格式对热流计算精度的影响,认为AUSM+格式在热流计算精确性方面具有优势;在热流绝对值的模拟上,网格的影响很大,能否计算出正确的驻点热流值将是获得精确物面热流解的关键;通过大量的数值计算、理论分析及其同试验数据的对比研究,对可能影响热流计算的网格因素进行了细致的分析,揭示了各因素对热流计算结果的影响规律。

Scheme effect and grid dependency in CFD heat computations are studied in this work. A variety of typical schemes, such as FDS, FVS AUSM ＋ and central finite difference, are evaluated in numerical experiments. Comprehensive comparisons between numerical results and experimental data reveal that the AUSM ＋ scheme has better resolutions in heat computations. In addition, the numerical stimulation of surface heat flux is highly sensitive to the grid system employed in the CFD computations. Studies of grid dependency demonstrate the influence mechanism of grid properties on heat transfer computations.