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Why Cl, Cd and Cm is unrealisitic?

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Old   March 20, 2022, 05:40
Default Why Cl, Cd and Cm is unrealisitic?
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FOAMraj
Join Date: Apr 2021
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I am simulating an unsteady incompressible flow over the pentagon. I am using komegasst turbulence model in pimpleFoam solver.
Here is the image of forceCoeff:
https://imgur.com/7rUyWEX

Here is the image of mesh:
https://imgur.com/S5nnjMq

Here is the velocity simulation image:
https://imgur.com/yYyXd7Y

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     4.0                                |
|   \\  /    A nd           | Web:         http://www.foam-extend.org         |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0.192 0 0);

boundaryField
{
    inlet
    { 
        type            fixedValue;
        value           uniform (0.192 0 0);
    }
    outlet
    {
        type            zeroGradient;
    }
    wall
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    obstacle
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    frontAndBack
    {
        type        empty;
    }
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

The pressure boundary condition:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     4.0                                |
|   \\  /    A nd           | Web:         http://www.foam-extend.org         |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0";
    object      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;
    }
    obstacle
    {
        type        zeroGradient;
    }
    frontAndBack
    {
        type        empty;
    }
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Let me know if I need to upload other files. Thank you in advance.
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Tags
external aerodynamics, force coefficients, turbulence analysis

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