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旋流器以水为介质在SimpleFoam中层流计算时，速度入口正常，两个压力出口全为负值，困惑

以下是我的p, u, fvSolution

    object      p;

dimensions      [0 2 -2 0 0 0 0];
internalField   uniform 0;
boundaryField
{
    inlet
    {
        type            zeroGradient;
    }
    outlet
    {
        type            fixedValue;
        value           uniform 0.002;
    }
    outlet_sec
    {
        type            fixedValue;
        value           uniform 0.0015;
    }
    wall
    {
        type            zeroGradient;
    }
}

    object      U;

dimensions      [0 1 -1 0 0 0 0];
internalField   uniform (0 0 0);
boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform (-3.2 0 0);
    }
    outlet
    {
        type            zeroGradient;
    }
    outlet_sec
    {
        type            zeroGradient;
    }
    wall
    {
        type            noSlip;
    }
}

    object      fvSolution;

solvers
{
    p
    {
        solver          GAMG;
        tolerance       1e-06;
        relTol          0.1;
        smoother        GaussSeidel;
    }

    "(U|k|epsilon|omega|f|v2)"
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance       1e-05;
        relTol          0.1;
    }
}

SIMPLE
{
    nNonOrthogonalCorrectors 0;
    consistent      yes;

    residualControl
    {
        p               1e-2;
        U               1e-3;
        "(k|epsilon|omega|f|v2)" 1e-3;
    }
        pRefCell			0;
	pRefValue			0;
}

relaxationFactors
{
    equations
    {
        U               0.9; 
        ".*"            0.9; 
    }
}