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tutorials: mixerVessel: Use standard meshing settings

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No advantage was found in the specific snappyHexMesh settings previously
specified for this case. This case now uses settings from the standard
snappyHexMesh.cfg file.

The rotating region has also been modified to align better with the
original block mesh. For sliding interface problems this is important in
order to reliably get good conformance to the cylinder edges.
This commit is contained in:
Will Bainbridge
2022-10-28 15:30:43 +01:00
parent 095f4b03f1
commit 495f4ba54c
4 changed files with 84 additions and 332 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
tutorials/multiphase/interFoam/RAS/mixerVessel/system/blockMeshDict
View File

@ -17,19 +17,19 @@ convertToMeters 1;
vertices
(
( -0.3 -0.3 -0.15)
( 0.3 -0.3 -0.15)
( 0.3 0.3 -0.15)
( -0.3 0.3 -0.15)
( -0.3 -0.3 1.4)
( 0.3 -0.3 1.4)
( 0.3 0.3 1.4)
( -0.3 0.3 1.4)
(-0.275 -0.275 -0.125)
( 0.275 -0.275 -0.125)
( 0.275 0.275 -0.125)
(-0.275 0.275 -0.125)
(-0.275 -0.275 1.325)
( 0.275 -0.275 1.325)
( 0.275 0.275 1.325)
(-0.275 0.275 1.325)
);
blocks
(
hex (0 1 2 3 4 5 6 7) (50 50 100) simpleGrading (1 1 1)
hex (0 1 2 3 4 5 6 7) (88 88 232) simpleGrading (1 1 1)
);
boundary

13
tutorials/multiphase/interFoam/RAS/mixerVessel/system/controlDict
View File

@ -52,4 +52,17 @@ maxAlphaCo 1;
maxDeltaT 1;
functions
{
#includeFunc cutPlaneSurface
(
point=(0 0 0),
normal=(1 -1 0),
interpolate=no,
alpha.oil,
p_rgh,
U
)
}
// ************************************************************************* //

31
tutorials/multiphase/interFoam/RAS/mixerVessel/system/meshQualityDict Normal file
View File

@ -0,0 +1,31 @@
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object meshQualityDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#includeEtc "caseDicts/mesh/generation/meshQualityDict.cfg"
//- Minimum quality of the tet formed by the face-centre
// and variable base point minimum decomposition triangles and
// the cell centre. Set to very negative number (e.g. -1e30) to
// disable.
// <0 = inside out tet,
// 0 = flat tet
// 1 = regular tet
minTetQuality -1e30;
//- Minimum face twist. Set to <-1 to disable. dot product of face normal
// and face centre triangles normal
minTwist 0.05;
// ************************************************************************* //

354
tutorials/multiphase/interFoam/RAS/mixerVessel/system/snappyHexMeshDict
View File

@ -13,7 +13,8 @@ FoamFile
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Which of the steps to run
#includeEtc "caseDicts/mesh/generation/snappyHexMeshDict.cfg"
castellatedMesh true;
snap true;
addLayers false;
@ -24,7 +25,6 @@ geometry
{
type triSurfaceMesh;
file "mixerVessel-vessel.stl";
regions
{
vessel
@ -33,12 +33,10 @@ geometry
}
}
}
oilInlet
{
type triSurfaceMesh;
file "mixerVessel-oilInlet.stl";
regions
{
oilInlet
@ -47,12 +45,10 @@ geometry
}
}
}
outlet
{
type triSurfaceMesh;
file "mixerVessel-outlet.stl";
regions
{
outlet
@ -61,12 +57,10 @@ geometry
}
}
}
shaftRotating
{
type triSurfaceMesh;
file "mixerVessel-shaftRotating.stl";
regions
{
shaftRotating
@ -75,12 +69,10 @@ geometry
}
}
}
shaft
{
type triSurfaceMesh;
file "mixerVessel-shaft.stl";
regions
{
shaft
@ -89,12 +81,10 @@ geometry
}
}
}
sparger
{
type triSurfaceMesh;
file "mixerVessel-sparger.stl";
regions
{
sparger
@ -103,12 +93,10 @@ geometry
}
}
}
stirrer
{
type triSurfaceMesh;
file "mixerVessel-stirrer.stl";
regions
{
stirrer
@ -117,12 +105,10 @@ geometry
}
}
}
baffles
{
type triSurfaceMesh;
file "mixerVessel-baffles.stl";
regions
{
baffles
@ -131,7 +117,6 @@ geometry
}
}
}
rotating
{
type triSurfaceMesh;
@ -139,430 +124,153 @@ geometry
}
};
// Settings for the castellatedMesh generation.
castellatedMeshControls
{
// Refinement parameters
// ~~~~~~~~~~~~~~~~~~~~~
// If local number of cells is >= maxLocalCells on any processor
// switches from from refinement followed by balancing
// (current method) to (weighted) balancing before refinement.
maxLocalCells 100000;
// Overall cell limit (approximately). Refinement will stop immediately
// upon reaching this number so a refinement level might not complete.
// Note that this is the number of cells before removing the part which
// is not 'visible' from the keepPoint. The final number of cells might
// actually be a lot less.
maxGlobalCells 3000000;
// The surface refinement loop might spend lots of iterations refining just a
// few cells. This setting will cause refinement to stop if <= minimumRefine
// are selected for refinement. Note: it will at least do one iteration
// (unless the number of cells to refine is 0)
minRefinementCells 0;
// Allow a certain level of imbalance during refining
// (since balancing is quite expensive)
// Expressed as fraction of perfect balance (= overall number of cells /
// nProcs). 0=balance always.
maxLoadUnbalance 0.10;
// Number of buffer layers between different levels.
// 1 means normal 2:1 refinement restriction, larger means slower
// refinement.
nCellsBetweenLevels 1;
// Explicit feature edge refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Specifies a level for any cell intersected by explicitly provided
// edges.
// This is a featureEdgeMesh, read from constant/geometry for now.
// Specify 'levels' in the same way as the 'distance' mode in the
// refinementRegions (see below). The old specification
// level 2;
// is equivalent to
// levels ((0 2));
features
(
{
file "mixerVessel-shaftRotating.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-shaft.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-sparger.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-stirrer.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-baffles.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "rotating.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-oilInlet.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-vessel.eMesh";
levels ((1 1));
levels ((0 0));
}
{
file "mixerVessel-outlet.eMesh";
levels ((1 1));
levels ((0 0));
}
);
// Surface based refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~
// Specifies two levels for every surface. The first is the minimum level,
// every cell intersecting a surface gets refined up to the minimum level.
// The second level is the maximum level. Cells that 'see' multiple
// intersections where the intersections make an
// angle > resolveFeatureAngle get refined up to the maximum level.
refinementSurfaces
{
vessel
{
level (1 2);
level (0 1);
patchInfo
{
type wall;
inGroups (meshedWalls);
}
}
oilInlet
{
level (0 1);
level (0 0);
patchInfo
{
type patch;
}
}
outlet
{
level (0 1);
level (0 0);
patchInfo
{
type patch;
}
}
shaftRotating
{
level (1 1);
level (0 0);
patchInfo
{
$../../vessel/patchInfo
}
}
shaft
{
level (1 1);
level (0 0);
patchInfo
{
$../../vessel/patchInfo
}
}
sparger
{
level (1 1);
level (0 0);
patchInfo
{
$../../vessel/patchInfo
}
}
stirrer
{
level (1 1);
level (0 0);
patchInfo
{
$../../vessel/patchInfo
}
}
baffles
{
level (1 1);
level (0 0);
patchInfo
{
$../../vessel/patchInfo
}
}
rotating
{
level (1 2);
level (0 0);
cellZone rotating;
faceZone rotating;
mode insidePoint;
mode insidePoint;
insidePoint (0 0.1 0.5);
}
}
// Feature angle:
// - used if min and max refinement level of a surface differ
// - used if feature snapping (see snapControls below) is used
resolveFeatureAngle 30;
// Mesh selection
// ~~~~~~~~~~~~~~
// After refinement patches get added for all refinementSurfaces and
// all cells intersecting the surfaces get put into these patches. The
// section reachable from the insidePoint is kept.
// NOTE: This point should never be on a face, always inside a cell, even
// after refinement.
insidePoint (0 0.1 1.0);
// Whether any faceZones (as specified in the refinementSurfaces)
// are only on the boundary of corresponding cellZones or also allow
// free-standing zone faces. Not used if there are no faceZones.
allowFreeStandingZoneFaces true;
allowFreeStandingZoneFaces false;
}
// Settings for the snapping.
snapControls
{
// Number of patch smoothing iterations before finding correspondence
// to surface
nSmoothPatch 3;
// Maximum relative distance for points to be attracted by surface.
// True distance is this factor times local maximum edge length.
// Note: changed(corrected) w.r.t 17x! (17x used 2* tolerance)
tolerance 3.0;
// Number of mesh displacement relaxation iterations.
nSolveIter 30;
// Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 5;
// Feature snapping
// Number of feature edge snapping iterations.
// Leave out altogether to disable.
nFeatureSnapIter 15;
// Detect (geometric only) features by sampling the surface
// (default=false).
implicitFeatureSnap false;
// Use castellatedMeshControls::features (default = true)
explicitFeatureSnap true;
// Detect features between multiple surfaces
// (only for explicitFeatureSnap, default = false)
multiRegionFeatureSnap false;
implicitFeatureSnap false;
explicitFeatureSnap true;
}
// Settings for the layer addition.
addLayersControls
{
// Are the thickness parameters below relative to the undistorted
// size of the refined cell outside layer (true) or absolute sizes (false).
relativeSizes true;
// Layer thickness specification. This can be specified in one of four ways
// - expansionRatio and finalLayerThickness (cell nearest internal mesh)
// - expansionRatio and firstLayerThickness (cell on surface)
// - overall thickness and firstLayerThickness
// - overall thickness and finalLayerThickness
// Expansion factor for layer mesh
expansionRatio 1.0;
// Wanted thickness of final added cell layer. If multiple layers
// is the thickness of the layer furthest away from the wall.
// Relative to undistorted size of cell outside layer.
// See relativeSizes parameter.
finalLayerThickness 0.3;
// Wanted thickness of the layer next to the wall.
// If relativeSizes this is relative to undistorted size of cell
// outside layer.
// firstLayerThickness 0.3;
// Wanted overall thickness of layers.
// If relativeSizes this is relative to undistorted size of cell
// outside layer.
// thickness 0.5
// Minimum overall thickness of total layers. If for any reason layer
// cannot be above minThickness do not add layer.
// If relativeSizes this is relative to undistorted size of cell
// outside layer..
minThickness 0.25;
// Per final patch (so not geometry!) the layer information
// Note: This behaviour changed after 21x. Any non-mentioned patches
// now slide unless:
// - nSurfaceLayers is explicitly mentioned to be 0.
// - angle to nearest surface < slipFeatureAngle (see below)
layers
{
vessel
{
nSurfaceLayers 1;
expansionRatio 1.3;
finalLayerThickness 0.5;
minThickness 0.1;
}
}
{}
// If points get not extruded do nGrow layers of connected faces that are
// also not grown. This helps convergence of the layer addition process
// close to features.
// Note: changed(corrected) w.r.t 17x! (didn't do anything in 17x)
nGrow 0;
// Advanced settings
// When not to extrude surface. 0 is flat surface, 90 is when two faces
// are perpendicular
featureAngle 60;
// At non-patched sides allow mesh to slip if extrusion direction makes
// angle larger than slipFeatureAngle.
slipFeatureAngle 30;
// Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 10;
// Number of smoothing iterations of surface normals
nSmoothSurfaceNormals 1;
// Number of smoothing iterations of interior mesh movement direction
nSmoothNormals 3;
// Smooth layer thickness over surface patches
nSmoothThickness 10;
// Stop layer growth on highly warped cells
maxFaceThicknessRatio 0.5;
// Reduce layer growth where ratio thickness to medial
// distance is large
maxThicknessToMedialRatio 0.3;
// Angle used to pick up medial axis points
// Note: changed(corrected) w.r.t 17x! 90 degrees corresponds to 130 in 17x.
minMedianAxisAngle 90;
// Create buffer region for new layer terminations
nBufferCellsNoExtrude 0;
// Overall max number of layer addition iterations. The mesher will exit
// if it reaches this number of iterations; possibly with an illegal
// mesh.
nLayerIter 50;
// Max number of iterations after which relaxed meshQuality controls
// get used. Up to nRelaxIter it uses the settings in meshQualityControls,
// after nRelaxIter it uses the values in meshQualityControls::relaxed.
nRelaxedIter 20;
// Additional reporting: if there are just a few faces where there
// are mesh errors (after adding the layers) print their face centres.
// This helps in tracking down problematic mesh areas.
// additionalReporting true;
relativeSizes true;
expansionRatio 1.2;
finalLayerThickness 0.5;
minThickness 1e-3;
}
// Generic mesh quality settings. At any undoable phase these determine
// where to undo.
meshQualityControls
{
// Maximum non-orthogonality allowed. Set to 180 to disable.
maxNonOrtho 65;
writeFlags
();
// Max skewness allowed. Set to <0 to disable.
maxBoundarySkewness 20;
maxInternalSkewness 4;
// Max concaveness allowed. Is angle (in degrees) below which concavity
// is allowed. 0 is straight face, <0 would be convex face.
// Set to 180 to disable.
maxConcave 80;
//- Minimum cell pyramid volume relative to min bounding box length^3
// Set to a fraction of the smallest cell volume expected.
// Set to very negative number (e.g. -1e30) to disable.
minVol -1e30;
// Minimum quality of the tet formed by the face-centre
// and variable base point minimum decomposition triangles and
// the cell centre. This has to be a positive number for tracking
// to work. Set to very negative number (e.g. -1e30) to
// disable.
// <0 = inside out tet,
// 0 = flat tet
// 1 = regular tet
minTetQuality -1e-30;
// Minimum face twist. Set to <-1 to disable. dot product of face normal
// and face centre triangles normal
minTwist 0.05;
// minimum normalised cell determinant
// 1 = hex, <= 0 = folded or flattened illegal cell
minDeterminant 0.001;
// minFaceWeight (0 -> 0.5)
minFaceWeight 0.05;
// minVolRatio (0 -> 1)
minVolRatio 0.01;
// Advanced
// Number of error distribution iterations
nSmoothScale 4;
// amount to scale back displacement at error points
errorReduction 0.75;
// Optional : some meshing phases allow usage of relaxed rules.
// See e.g. addLayersControls::nRelaxedIter.
relaxed
{
//- Maximum non-orthogonality allowed. Set to 180 to disable.
maxNonOrtho 75;
}
}
// Advanced
// Merge tolerance. Is fraction of overall bounding box of initial mesh.
// Note: the write tolerance needs to be higher than this.
mergeTolerance 1e-6;
// ************************************************************************* //