各位老师同学大家好，我现在在运行一个模拟，在模拟的过程中出现了以下报错：

Time = 8.34459

Courant Number mean: 0.00149812 max: 1.90051
smoothSolver:  Solving for Ux, Initial residual = 0.0914128, Final residual = 4.03307e-06, No Iterations 6
smoothSolver:  Solving for Uy, Initial residual = 0.116317, Final residual = 4.73709e-06, No Iterations 7
smoothSolver:  Solving for Uz, Initial residual = 0.140183, Final residual = 4.1816e-06, No Iterations 8
Pressure gradient source: uncorrected Ubar = 0.056814, pressure gradient = 1279.18
GAMG:  Solving for p, Initial residual = 0.0866448, Final residual = 0.00785603, No Iterations 2
time step continuity errors : sum local = 4.49765e-06, global = -3.85726e-06, cumulative = -9.48652e-06
Pressure gradient source: uncorrected Ubar = 0.0571471, pressure gradient = 1245.86
GAMG:  Solving for p, Initial residual = 0.0145691, Final residual = 7.22072e-07, No Iterations 10
time step continuity errors : sum local = 4.85089e-10, global = -5.57637e-11, cumulative = -9.48658e-06
Pressure gradient source: uncorrected Ubar = 0.0578682, pressure gradient = 1173.73
ExecutionTime = 57314.4 s  ClockTime = 57674 s

Time = 8.3446

Courant Number mean: 0.00199659 max: 2.63028
smoothSolver:  Solving for Ux, Initial residual = 0.117271, Final residual = 4.41292e+10, No Iterations 1000
smoothSolver:  Solving for Uy, Initial residual = 0.151209, Final residual = 1.72604e+11, No Iterations 1000
smoothSolver:  Solving for Uz, Initial residual = 0.196965, Final residual = 5.62502e+11, No Iterations 1000
Pressure gradient source: uncorrected Ubar = 1.59814e+11, pressure gradient = -1.59872e+16
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0855593, No Iterations 1
time step continuity errors : sum local = 1.0959e+08, global = 6.17828e+07, cumulative = 6.17828e+07
Pressure gradient source: uncorrected Ubar = 7.1484e+10, pressure gradient = -7.151e+15
GAMG:  Solving for p, Initial residual = 0.491208, Final residual = 8.042e-07, No Iterations 13
time step continuity errors : sum local = 1836.7, global = -208.498, cumulative = 6.17826e+07
Pressure gradient source: uncorrected Ubar = -5.58949e+10, pressure gradient = 5.59152e+15
ExecutionTime = 57314.8 s  ClockTime = 57674 s

Time = 8.34461

Courant Number mean: 2.96516e+09 max: 8.66454e+12

Courant Number突然变大了很多倍导致模拟发散，这是什么原因呢？

我在网上查到了造成这种问题的几种原因：

网格太小。但是我增大了网格后还是在这个时间点发散，所以应该不是网格大小的问题。
时间步长太大。我尝试减小为原来步长的1/100,结果还是发散。
边界条件的问题。以下是我的压力边界条件，但是不知道怎么调整，因为是按照论文上的边界条件设置的。

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 0.0001;

    }

    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    bottom
    {
        type            zeroGradient;
    }
    
    top
    {
        type            zeroGradient;
    }

    particles
    {
        type            zeroGradient;
    }

    leftCyclic
    {
        type            cyclic;
    }

    rightCyclic
    {
        type            cyclic;
    }
}

希望大家给出一些指导，非常感谢！

CFD中文网

MingfengWang