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[snappyHexMesh] Internal flow using stl file with snappyHexMesh

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Old   June 23, 2023, 08:18
Default Internal flow using stl file with snappyHexMesh
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Björn
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Hi everyone
I have a stl file of a swirl separator. I want to simulate the inner flow in OpenFoam. I’m very sure that I have to use snappyHexMesh and therefore I need a “box” in which the model placed. But for some reason whenever I run simulation or just want to have a look at the model in paraview I only see the box without the model. What am I missing?
I have the stp file of the swirl separator from here:
https://grabcad.com/library/zyklonabscheider-1
Following are the files snappyHexMeshDict and blockMeshDict.
snappyHexMeshDict:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 10 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object autoHexMeshDict;
}

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

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
castellatedMesh true;
snap true;
addLayers true;
geometry
{
Cyclone-Mesh_230622_GSI.stl
{
type triSurfaceMesh;
name cyclone;
}
};
castellatedMeshControls
{
maxLocalCells 8000000;
maxGlobalCells 10000000;
minRefinementCells 0;
maxLoadUnbalance 0.0;
nCellsBetweenLevels 1;

features
(
{
file "ImageToStl.com_zyklonabscheider-3-38.eMesh";
level 3;
}
);

refinementSurfaces
{
cyclone
{
level (3 3);
faceZone insideFaces;
cellZone insideZone;
cellZoneInside insidePoint;
insidePoint (0.0 0.0 0.0);
}
inlet_block
{
level ( 0 0 );
patchInfo
{
type patch;//wall;
}
}
outlet_block
{
level ( 0 0 );
patchInfo
{
type patch;//wall;
}
}
walls_block
{
level ( 0 0 );
patchInfo
{
type patch;//wall;
}
}
}

resolveFeatureAngle 30;

refinementRegions
{
}

locationInMesh (0 0 0);
allowFreeStandingZoneFaces false;
}


snapControls
{
nSmoothPatch 5;
tolerance 1.0;
nSolveIter 300;
nRelaxIter 10;
nFeatureSnapIter 5;
implicitFeatureSnap false;
explicitFeatureSnap true;

multiRegionFeatureSnap false;
}

addLayersControls
{
relativeSizes false;
layers
{

insideZone_to_outsideZone
{

nSurfaceLayers 3;
}
}

expansionRatio 1.005;

finalLayerThickness 0.0001;
minThickness 0.00005;
nGrow 0;
featureAngle 85;
slipFeatureAngle 25;
nRelaxIter 5;
nSmoothSurfaceNormals 4;
nSmoothNormals 3;
nSmoothThickness 10;
maxFaceThicknessRatio 0.5;
maxThicknessToMedialRatio 0.2;
minMedianAxisAngle 90;
nBufferCellsNoExtrude 0;

nLayerIter 50;
}
meshQualityControls
{
maxNonOrtho 65.0;
maxBoundarySkewness 20.0;
maxInternalSkewness 4.0;
maxConcave 80.0;
minVol 1.0E-14;
minTetQuality 1.0E-20;
minArea -1.0;
minTwist 0.02;
minTriangleTwist -1.0;
minDeterminant 0.01;
minFaceWeight 0.05;
minVolRatio 0.01;
minVolCollapseRatio 0.1;
nSmoothScale 4;
errorReduction 0.75;
relaxed
{
maxNonOrtho 75.0;
}
}
writeFlags
(
scalarLevels
layerSets
layerFields
);
mergeTolerance 1e-6;
// ************************************************** ****************** //

blockMeshDict:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 10 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1; //This gives you the scale: 0.001 would mean all units in this file are [mm]

vertices //list of vertices defining the geometry
(
(-1000 -1000 -1000) //This is point 0. Not 1!
(1000 -1000 -1000) //This is point 1
(1000 1000 -1000) //point 2
(-1000 1000 -1000) //point 3
(-1000 -1000 1000) //point 4
(1000 -1000 1000) //point 5
(1000 1000 1000) //point 6
(-1000 1000 1000) //point 7
);

blocks //defining the block which the geometry is made out of
(
hex (0 1 2 3 4 5 6 7) (50 25 50) simpleGrading (1 1 1)
//this means that the only block in the geometry is defined by vertices (0 1 2 ...), there are 100, 10
//and 1 cells in the x, y, and z direction and that in each direction all the cells have the same length
);

//edges
//(
// spline 0 1
// (
// (5 -2 0)
// )
// spline 4 5
// (
// (5 -2 0.1)
// )
//);

boundary (
inlet_block
{
type patch;
faces (
(3 7 4 0)
);
}
outlet_block
{
type patch;
faces (
(2 1 5 6)
);
}
walls_block
{
type wall;
faces (
(1 2 3 0)
(7 6 5 4)
(0 4 5 1)
(2 6 7 3)
);
}
);


// ************************************************** *********************** //
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Old   July 5, 2023, 23:43
Default
  #2
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FOAMraj
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Make sure to check the scale factor in blockMesh and the location in mesh in snappyHexMeshDict.
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