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    p_rgh迭代次数过大

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    • L
      lixh last edited by 李东岳

      我最近在用twophaseeulerfoam求解器,请问下p_rgh迭代次数超过1000是怎么回事?能减少其迭代次数吗?

      Courant Number mean: 2.96985e-08 max: 0.000906108
      Max Ur Courant Number = 1.0007
      deltaT = 7.81647e-10
      Time = 0.00027487919
      
      PIMPLE: iteration 1
      MULES: Solving for alpha.air
      MULES: Solving for alpha.air
      smoothSolver:  Solving for alpha.air, Initial residual = 2.72559e-21, Final residual = 4.77894e-22, No Iterations 2
      alpha.air volume fraction = 4.27076e-08  Min(alpha.air) = 0  Max(alpha.air) = 1
      Constructing momentum equations
      nonePCG:  Solving for p_rgh, Initial residual = 0.381368, Final residual = 0.0874588, No Iterations 1001
      nonePCG:  Solving for p_rgh, Initial residual = 0.361702, Final residual = 0.090747, No Iterations 1001
      
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        xpqiu 教授 @lixh last edited by

        @lixh 输出显示你没有给PCG 用 preconditioner。在你的 fvSolution 文件,p_rgh 里设置了 solver 为 PCG,但是你没有设置 preconditioner,或者,preconditioner 设置成了 none。把 preconditioner 设置为 DIC试试。

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        • L
          lixh @xpqiu last edited by

          @xpqiu DIC这个我试过,但是会报错

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            xpqiu 教授 @lixh last edited by

            @lixh PCG+DIC的组合算是很稳定的了,如果这个都报错,那估计你的算例设置有点问题。

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            • L
              lixh @xpqiu last edited by

              @xpqiu 之前是GANG +DIC组合,这个到后来也会报错,可能真的是其它设置的问题,谢谢啦,我再试试:happy:

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              • Y
                yuan_neu last edited by

                是不是可以设置一下relTol

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