本文采用高精度有限差分法对矩形管道内充分发展湍流换热进行了直接数值模拟,湍流雷诺数Rer和普朗特数分别为400(Rem=6200)和0.71,压力泊松方程分别采用两种不同的离散格式(二阶和四阶中心差分离散).结果表明,同二阶中心差分格式相比,高精度有限差分可以在较少的网格下得到较好的结果;压力泊松方程采用四阶中心差分或二阶中心差分对计算结果的影响甚小,但采用二阶中心差分时,可以节省大量的计算时间.
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