[gxy200992243]

Hi, everyone!

Now I am dealing with flow of a car rear mirror. There are two major mistakes in my simulation results, and I cannot figure out the reason.

1 Reverse flow is observed at outlet of the domain.
2 I set the upwall and side wall to be moving with a velocity of 39m/s, but the simulation results show zero velocity at the upwall and side wall.

I am using the Smagorinsky model. ck=0.05,ce=1.05. The streamwise velocity contour is also attached.

Can anyone help me deal with these two problems? Billions of thanks!

Information about my boundary conditions is listed below:

boundary
(
    movingWall
    {
        type            wall;
        nFaces          17380;
        startFace       3061330;
    }
    wall
    {
        type            wall;
        nFaces          19320;
        startFace       3078710;
    }
    outlet
    {
        type            patch;
        nFaces          7700;
        startFace       3098030;
    }
    inlet
    {
        type            patch;
        nFaces          4540;
        startFace       3105730;
    }
)

0/U

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 -39);

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform (0 0 -39);
    }

    outlet
    {
        type            zeroGradient;
    }

    wall
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    movingWall
    {
        type            fixedValue;
        value           uniform (0 0 -39);
    }

}

0/p

dimensions      [0 2 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    wall
    {
        type            zeroGradient;
    }
    movingWall
    {
        type            zeroGradient;
    }

}

0/nuSgs

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
    }

    wall
    {
        type            zeroGradient;
    }
    movingWall
    {
        type            zeroGradient;
    }
}

0/nuTilda

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    outlet
    {
        type            zeroGradient;
    }

    wall
    {
        type            zeroGradient;
    }
    movingWall
    {
        type            zeroGradient;
    }
}