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Flow past circular cylinder - pisoFoam

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Old   June 27, 2020, 08:04
Default Please help!!! Flow past circular cylinder - pisoFoam
  #1
New Member
 
Mudit Mehta
Join Date: Jun 2020
Posts: 19
Rep Power: 6
tony256 is on a distinguished road
Please help!!!

I am trying to simulate flow past a circular cylinder at Re = 3900. But my drag and lift coefficient is not coming correctly. My all the related files are attached below. Please suggest where i am doing wrong? Please Help. Thanks in advance. I am quite new to OpenFOAM. and stuck on this problem.
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform (1 0 0);

boundaryField
{
    inlet
    {
        type            freestreamVelocity;
        //referenceField  uniform (10 0 0);
        //fluctuationScale (0.02 0.01 0.01);
        freestreamValue           uniform (1 0 0);
    }

    outlet
    {
        type            zeroGradient;
        
    }

    top
    {
        type            noSlip;
    }

    bottom
    {
        type            noSlip;
    }

    cylinder
    {
        type            noSlip;
    }

    front
    {
        type            symmetryPlane;
    }

    Back
    {
        type            symmetryPlane;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    top
    {
        type            zeroGradient;
    }

    bottom
    {
        type            zeroGradient;
    }

    cylinder
    {
        type            zeroGradient;
    }

    front
    {
        type            symmetryPlane;
    }

    Back
    {
        type            symmetryPlane;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      k;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 2e-05;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    top
    {
        type            fixedValue;
        value           uniform 0;
    }

    bottom
    {
        type            fixedValue;
        value           uniform 0;
    }

    cylinder
    {
        type            fixedValue;
        value           uniform 0;
    }

    front
    {
        type            symmetryPlane;
    }

    Back
    {
        type            symmetryPlane;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
    }

    top
    {
        type            zeroGradient;
    }

    bottom
    {
        type            zeroGradient;
    }

    cylinder
    {
        type            zeroGradient;
    }

    Back
    {
        type            symmetryPlane;
    }

    front
    {
        type            symmetryPlane;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      nuTilda;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

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

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    top
    {
        type            fixedValue;
        value           uniform 0;
    }

    bottom
    {
        type            fixedValue;
        value           uniform 0;
    }

    cylinder
    {
        type            fixedValue;
        value           uniform 0;
    }

    front
    {
        type            symmetryPlane;
    }

    Back
    {
        type            symmetryPlane;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      s;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 0 0 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 1;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    top
    {
        type            zeroGradient;
    }

    bottom
    {
        type            zeroGradient;
    }

    front
    {
        type            symmetryPlane;
    }

    Back
    {
        type            symmetryPlane;
    }


    cylinder
    {
        type            zeroGradient;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      transportProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

transportModel  Newtonian;

nu              [0 2 -1 0 0 0 0] 0.00025641103;
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      turbulenceProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

simulationType  LES;

LES
{
    LESModel        dynamicKEqn;

    turbulence      on;

    printCoeffs     on;

    delta           cubeRootVol;

    dynamicKEqnCoeffs
    {
        filter simple;
    }

    cubeRootVolCoeffs
    {
        deltaCoeff      1;
    }

    PrandtlCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        smoothCoeffs
        {
            delta           cubeRootVol;
            cubeRootVolCoeffs
            {
                deltaCoeff      1;
            }

            maxDeltaRatio   1.1;
        }

        Cdelta          0.158;
    }

    vanDriestCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        smoothCoeffs
        {
            delta           cubeRootVol;
            cubeRootVolCoeffs
            {
                deltaCoeff      1;
            }

            maxDeltaRatio   1.1;
        }

        Aplus           26;
        Cdelta          0.158;
    }

    smoothCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        maxDeltaRatio   1.1;
    }
}
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application     pisoFoam;

startFrom       startTime;

startTime       0;

stopAt          endTime;

endTime         30;

deltaT          0.005;

writeControl    timeStep;

writeInterval   100;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

functions
{
    probes
    {
        type            probes;
        libs            ("libsampling.so");
        writeControl    timeStep;
        writeInterval   1;

        fields
        (
            p
        );

        probeLocations
        (
            (0.0254 0.0253 0)
            (0.0508 0.0253 0)
            (0.0762 0.0253 0)
            (0.1016 0.0253 0)
            (0.127 0.0253 0)
            (0.1524 0.0253 0)
            (0.1778 0.0253 0)
        );

    }

    fieldAverage1
    {
        type            fieldAverage;
        libs            ("libfieldFunctionObjects.so");
        writeControl    writeTime;

        fields
        (
            U
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }

            p
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }
        );
    }

    surfaceSampling
    {
        // Sample near-wall velocity

        type surfaces;

        // Where to load it from (if not already in solver)
        libs            ("libsampling.so");
        writeControl    writeTime;

        interpolationScheme cellPoint;

        surfaceFormat vtk;

        // Fields to be sampled
        fields
        (
            U
        );

        surfaces
        (
            nearWall
            {
                type            patchInternalField;
                patches         ( lowerWall );
                distance        1E-6;
                interpolate     true;
                triangulate     false;
            }
        );
    }

    #includeFunc scalarTransport
}

functions
{
vorticity
    {
        type            vorticity;
        libs            ("libfieldFunctionObjects.so");
        writeControl    writeTime;
    }

    forces
    {
        type            forceCoeffs;
        libs            ("libforces.so");
        log             yes;
        writeControl timeStep;
        writeInterval 40;

        patches
        (
            cylinder
        );

        rho rhoInf;
      p p;
      U U;
        rhoInf      1;

        CofR        (0 0 0);
        liftDir     (0 1 0);
        dragDir     (1 0 0);
        pitchAxis   (0 0 1);
        magUInf     1;
        lRef        3.14;
        Aref        3.14;
    }


  error
  {
      // Load the library containing the 'coded' functionObject
      libs            ("libutilityFunctionObjects.so");

      type coded;

      // Name of on-the-fly generated functionObject
      name error;

      codeEnd
      #{
          // Lookup U
          Info<< "Looking up field U\n" << endl;
          const volVectorField& U = mesh().lookupObject<volVectorField>("U");

          Info<< "Reading inlet velocity uInfX\n" << endl;

          scalar ULeft = 0.0;
          label leftI = mesh().boundaryMesh().findPatchID("left");
          const fvPatchVectorField& fvp = U.boundaryField()[leftI];
          if (fvp.size())
          {
              ULeft = fvp[0].x();
          }
          reduce(ULeft, maxOp<scalar>());

          dimensionedScalar uInfX
          (
              "uInfx",
              dimensionSet(0, 1, -1, 0, 0),
              ULeft
          );

          Info << "U at inlet = " << uInfX.value() << " m/s" << endl;


          scalar magCylinder = 0.0;
          label cylI = mesh().boundaryMesh().findPatchID("cylinder");
          const fvPatchVectorField& cylFvp = mesh().C().boundaryField()[cylI];
          if (cylFvp.size())
          {
              magCylinder = mag(cylFvp[0]);
          }
          reduce(magCylinder, maxOp<scalar>());

          dimensionedScalar radius
          (
              "radius",
              dimensionSet(0, 1, 0, 0, 0),
              magCylinder
          );

          Info << "Cylinder radius = " << radius.value() << " m" << endl;

          volVectorField UA
          (
              IOobject
              (
                  "UA",
                  mesh().time().timeName(),
                  U.mesh(),
                  IOobject::NO_READ,
                  IOobject::AUTO_WRITE
              ),
              U
          );

          Info<< "\nEvaluating analytical solution" << endl;

          const volVectorField& centres = UA.mesh().C();
          volScalarField magCentres(mag(centres));
          volScalarField theta(acos((centres & vector(1,0,0))/magCentres));

          volVectorField cs2theta
          (
              cos(2*theta)*vector(1,0,0)
            + sin(2*theta)*vector(0,1,0)
          );

          UA = uInfX*(dimensionedVector(vector(1,0,0))
            - pow((radius/magCentres),2)*cs2theta);

          // Force writing of UA (since time has not changed)
          UA.write();

          volScalarField error("error", mag(U-UA)/mag(UA));

          Info<<"Writing relative error in U to " << error.objectPath()
              << endl;

          error.write();
      #};
  }

}

// ************************************************************************* //

Last edited by tony256; June 28, 2020 at 09:42.
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Old   June 27, 2020, 20:29
Default
  #2
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Mudit Mehta
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Posts: 19
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I am still stuck on this problem. Please have a look and help.
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Old   March 18, 2021, 08:27
Default
  #3
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Bushra Rasheed
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Were you able to solve this ?
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Old   March 18, 2021, 15:33
Default
  #4
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Michael Alletto
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Location: Bremen
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mAlletto will become famous soon enough
2d LES is always wrong. With LES one tries to resolve the relevant turbulent motion. Turbulent Eddies are always 3d.

Is the drag and lift too high or too small
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