# Why Cl, Cd and Cm is unrealisitic?

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 March 20, 2022, 05:40 Why Cl, Cd and Cm is unrealisitic? #1 New Member   FOAMraj Join Date: Apr 2021 Posts: 19 Rep Power: 5 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.