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PISO算法是不需要对压力进行亚松弛处理的,可是为什么fluent中PISO算法中默认情况下对压力是要进行亚松弛处理的,且松弛因子默认值为0.3。在实际计算过程中,我尝试过在PISO算法下将压力松弛因子修改为1,但是计算没有默认的0.3稳定,容易发散,实在搞不懂是怎么回事。