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Initial and boundary conditions
- At first we need to change the patch types of patches between inside and outside meshes (AMIInside and AMIOutside), the new type should be cyclicAMI.
- This boundary condition type additionally needs the parameter neighbourPatch.
- The file mixerCase/wholeMesh/constant/polyMesh/boundary should contain the following lines
AMIOutside { type cyclicAMI; nFaces 160; startFace 22320; neighbourPatch AMIInside; } AMIInside { type cyclicAMI; nFaces 80; startFace 22560; neighbourPatch AMIOutside; } - NOTE: Numbers nFaces and startFaces are generated automatically during the mesh making process; so they might be different for different meshes.
- This manipulation may be done by utility changeDictionary. Look at wholeMesh/system/changeDictionaryDict.
# cd $FOAM_RUN /mixerCase/wholeMesh
# changeDictionary - Next we look at the boundary conditions.
- There is folder 0 with prepared files U, p_rgh and alpha.water.org in both test case’s directories MRFCase and SBMCase.
- We look at the conditions for velocity U:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.3.x | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | |*---------------------------------------------------------------------------*| | File created by CFD support s.r.o., Thu Oct 16 07:44:50 2014 | | http://www.cdfsupport.com | \*---------------------------------------------------------------------------*/ FoamFile { version 2.3; format ascii; class volVectorField; location "0"; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { frontAndBack { type empty; } fixedWalls { type fixedValue; value uniform (0 0 0); } AMIOutside { type cyclicAMI; value uniform (0 0 0); } mixer { type fixedValue; value uniform (0 0 0); } AMIInside { type cyclicAMI; value uniform (0 0 0); } } - Next we look at the conditions for pressure p_rgh:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.3.x | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | |*---------------------------------------------------------------------------*| | File created by CFD support s.r.o., Thu Oct 16 07:44:50 2014 | | http://www.cdfsupport.com | \*---------------------------------------------------------------------------*/ FoamFile { version 2.3; format ascii; class volScalarField; location "0"; object p_rgh; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [1 -1 -2 0 0 0 0]; internalField uniform 0; boundaryField { frontAndBack { type empty; } fixedWalls { type zeroGradient; //sets fixed gradient pressure based on the atmospheric pressure value uniform 0; } AMIOutside { type cyclicAMI; value uniform 0; } mixer { type zeroGradient; value uniform 0; } AMIInside { type cyclicAMI; value uniform 0; } } - We look at the file alpha.water.org, which is a backup file for alpha.water (the phase ratio).
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.3.x | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | |*---------------------------------------------------------------------------*| | File created by CFD support s.r.o., Thu Oct 16 07:44:50 2014 | | http://www.cdfsupport.com | \*---------------------------------------------------------------------------*/ FoamFile { version 2.3; format ascii; class volScalarField; location "0"; object alpha.water.org; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 0 0 0 0 0 0]; internalField uniform 0; boundaryField { frontAndBack { type empty; } fixedWalls { type zeroGradient; } AMIOutside { type cyclicAMI; value uniform 0; } mixer { type zeroGradient; } AMIInside { type cyclicAMI; value uniform 0; } }