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ENH: snappyHexMesh: allow layer thickness specification by total thickness

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This commit is contained in:
mattijs
2012-11-01 12:50:39 +00:00
parent 389170bc20
commit 6da9df714c
5 changed files with 881 additions and 476 deletions
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155
applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
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@ -226,37 +226,37 @@ castellatedMeshControls
// Settings for the snapping.
snapControls
{
//- Number of patch smoothing iterations before finding correspondence
// to surface
// 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.
// 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 2.0;
//- Number of mesh displacement relaxation iterations.
// Number of mesh displacement relaxation iterations.
nSolveIter 30;
//- Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
// 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.
// Number of feature edge snapping iterations.
// Leave out altogether to disable.
nFeatureSnapIter 10;
//- Detect (geometric only) features by sampling the surface
// (default=false).
// Detect (geometric only) features by sampling the surface
// (default=false).
implicitFeatureSnap false;
//- Use castellatedMeshControls::features (default = true)
// Use castellatedMeshControls::features (default = true)
explicitFeatureSnap true;
//- Detect features between multiple surfaces
// (only for explicitFeatureSnap, default = false)
// Detect features between multiple surfaces
// (only for explicitFeatureSnap, default = false)
multiRegionFeatureSnap false;
}
@ -267,9 +267,43 @@ addLayersControls
// 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 the layer furthest away from the wall.
// If relativeSizes this is relative to undistorted size of cell
// outside layer.
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.
// now slide unless:
// - nSurfaceLayers is explicitly mentioned to be 0.
// - angle to nearest surface < slipFeatureAngle (see below)
layers
{
sphere.stl_firstSolid
@ -281,9 +315,9 @@ addLayersControls
{
nSurfaceLayers 1;
// Per patch layer data
expansionRatio 1.3;
expansionRatio 1.3;
finalLayerThickness 0.3;
minThickness 0.1;
minThickness 0.1;
}
// Disable any mesh shrinking and layer addition on any point of
@ -294,41 +328,24 @@ addLayersControls
}
}
// 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.
// is the thickness of the layer furthest away from the wall.
// See relativeSizes parameter.
finalLayerThickness 0.3;
//- Minimum thickness of cell layer. If for any reason layer
// cannot be above minThickness do not add layer.
// Relative to undistorted size of cell outside layer.
// See relativeSizes parameter.
minThickness 0.25;
//- 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.
// 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
// make straight angle.
// When not to extrude surface. 0 is flat surface, 90 is when two faces
// make straight angle.
featureAngle 60;
//- At non-patched sides allow mesh to slip if extrusion direction makes
// angle larger than slipFeatureAngle.
// 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.
// Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 5;
// Number of smoothing iterations of surface normals
@ -374,51 +391,51 @@ addLayersControls
// where to undo.
meshQualityControls
{
//- Maximum non-orthogonality allowed. Set to 180 to disable.
// Maximum non-orthogonality allowed. Set to 180 to disable.
maxNonOrtho 65;
//- Max skewness allowed. Set to <0 to disable.
// 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.
// 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 pyramid volume. Is absolute volume of cell pyramid.
// Set to a sensible fraction of the smallest cell volume expected.
// Set to very negative number (e.g. -1E30) to disable.
// Minimum pyramid volume. Is absolute volume of cell pyramid.
// Set to a sensible fraction of the smallest cell volume expected.
// Set to very negative number (e.g. -1E30) to disable.
minVol 1e-13;
//- 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
// 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-9;
//- Minimum face area. Set to <0 to disable.
// Minimum face area. Set to <0 to disable.
minArea -1;
//- Minimum face twist. Set to <-1 to disable. dot product of face normal
//- and face centre triangles normal
// 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
// minimum normalised cell determinant
// 1 = hex, <= 0 = folded or flattened illegal cell
minDeterminant 0.001;
//- minFaceWeight (0 -> 0.5)
// minFaceWeight (0 -> 0.5)
minFaceWeight 0.05;
//- minVolRatio (0 -> 1)
// minVolRatio (0 -> 1)
minVolRatio 0.01;
//must be >0 for Fluent compatibility
// must be >0 for Fluent compatibility
minTriangleTwist -1;
//- if >0 : preserve single cells with all points on the surface if the
@ -429,9 +446,9 @@ meshQualityControls
// Advanced
//- Number of error distribution iterations
// Number of error distribution iterations
nSmoothScale 4;
//- amount to scale back displacement at error points
// amount to scale back displacement at error points
errorReduction 0.75;
// Optional : some meshing phases allow usage of relaxed rules.