334 lines
10 KiB
C++
334 lines
10 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
|
|
| ========= | |
|
|
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
|
|
| \\ / O peration | Version: v2306 |
|
|
| \\ / A nd | Website: www.openfoam.com |
|
|
| \\/ M anipulation | |
|
|
\*---------------------------------------------------------------------------*/
|
|
FoamFile
|
|
{
|
|
version 2.0;
|
|
format ascii;
|
|
class dictionary;
|
|
object snappyHexMeshDict;
|
|
}
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
// Which of the steps to run
|
|
castellatedMesh false;
|
|
snap false;
|
|
addLayers true;
|
|
|
|
|
|
// Geometry. Definition of all surfaces. All surfaces are of class
|
|
// searchableSurface.
|
|
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 2000000;
|
|
|
|
// 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/triSurface 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
|
|
();
|
|
|
|
|
|
// 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
|
|
{}
|
|
|
|
// Feature angle:
|
|
// - used if min and max refinement level of a surface differ
|
|
// - used if feature snapping (see snapControls below) is used
|
|
resolveFeatureAngle 30;
|
|
|
|
|
|
// Region-wise refinement
|
|
// ~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
// Specifies refinement level for cells in relation to a surface. One of
|
|
// three modes
|
|
// - distance. 'levels' specifies per distance to the surface the
|
|
// wanted refinement level. The distances need to be specified in
|
|
// increasing order.
|
|
// - inside. 'levels' is only one entry and only the level is used. All
|
|
// cells inside the surface get refined up to the level. The surface
|
|
// needs to be closed for this to be possible.
|
|
// - outside. Same but cells outside.
|
|
|
|
refinementRegions
|
|
{}
|
|
|
|
// 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 location(s)InMesh is kept.
|
|
// NOTE: This point should never be on a face, always inside a cell, even
|
|
// after refinement.
|
|
//
|
|
// There are two different ways of specifying the regions to keep:
|
|
// 1. a single locationInMesh. All the 'zoned' surfaces are marked as such
|
|
// in the refinementSurfaces with the faceZone and cellZone keywords.
|
|
//
|
|
// or
|
|
//
|
|
// 2. multiple locationsInMesh, with per location the name of the cellZone.
|
|
// This uses walking to determine zones and automatically creates
|
|
// faceZones on the outside of cellZones.
|
|
|
|
|
|
// Ad 1. Specify a single location and how to treat faces inbetween
|
|
// cellZones
|
|
locationInMesh (5 0.28 0.43);
|
|
|
|
// 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;
|
|
}
|
|
|
|
|
|
// 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 1.7.x! (1.7.x used 2* tolerance)
|
|
tolerance 2.0;
|
|
|
|
// Number of mesh displacement relaxation iterations.
|
|
nSolveIter 30;
|
|
|
|
// Maximum number of snapping relaxation iterations. Should stop
|
|
// before upon reaching a correct mesh.
|
|
nRelaxIter 5;
|
|
|
|
}
|
|
|
|
|
|
// 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 false;
|
|
|
|
// Layers defined by overall thickness and expansion ratio
|
|
thickness 0.7e-3;
|
|
firstLayerThickness 0.1e-3;
|
|
|
|
// 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 0.0001e-3;
|
|
|
|
|
|
// Per final patch (so not geometry!) the layer information
|
|
layers
|
|
{
|
|
maxY
|
|
{
|
|
nSurfaceLayers 3;
|
|
}
|
|
minY
|
|
{
|
|
nSurfaceLayers 3;
|
|
}
|
|
A
|
|
{
|
|
nSurfaceLayers 3;
|
|
}
|
|
A_slave
|
|
{
|
|
nSurfaceLayers 3;
|
|
}
|
|
}
|
|
|
|
// 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 1.7.x! (didn't do anything in 1.7.x)
|
|
nGrow 0;
|
|
|
|
// Advanced settings
|
|
|
|
|
|
// Static analysis of starting mesh
|
|
|
|
// When not to extrude surface. 0 is flat surface, 90 is when two faces
|
|
// are perpendicular
|
|
featureAngle 130;
|
|
|
|
// When to merge patch faces. Default is featureAngle
|
|
//mergePatchFacesAngle 45;
|
|
|
|
// Do not extrude around sharp edge if not both faces are extruded.
|
|
// Default is 0.5*featureAngle. Set to -180 always attempt extrusion
|
|
layerTerminationAngle -180;
|
|
|
|
// Stop layer growth on highly warped cells
|
|
maxFaceThicknessRatio 0.5;
|
|
|
|
|
|
// Patch displacement
|
|
|
|
// Number of smoothing iterations of surface normals
|
|
nSmoothSurfaceNormals 1;
|
|
|
|
// Smooth layer thickness over surface patches
|
|
nSmoothThickness 10;
|
|
|
|
|
|
|
|
// Medial axis analysis
|
|
|
|
// Angle used to pick up medial axis points
|
|
// Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130
|
|
// in 1.7.x.
|
|
minMedialAxisAngle 90;
|
|
|
|
// Reduce layer growth where ratio thickness to medial
|
|
// distance is large
|
|
maxThicknessToMedialRatio 0.3;
|
|
|
|
// Number of smoothing iterations of interior mesh movement direction
|
|
nSmoothNormals 3;
|
|
|
|
// Optional: at non-patched sides allow mesh to slip if extrusion
|
|
// direction makes angle larger than slipFeatureAngle. Default is
|
|
// 0.5*featureAngle.
|
|
slipFeatureAngle 30;
|
|
|
|
|
|
//// Motion solver instead of default medial axis
|
|
//
|
|
// //- Use displacementMotionSolver to shrink mesh
|
|
// meshShrinker displacementMotionSolver;
|
|
//
|
|
// //- Use laplacian for shrinking
|
|
// solver displacementLaplacian;
|
|
//
|
|
// displacementLaplacianCoeffs
|
|
// {
|
|
// diffusivity quadratic inverseDistance ("m.*");
|
|
// }
|
|
|
|
|
|
|
|
// Mesh shrinking
|
|
|
|
// Maximum number of snapping relaxation iterations. Should stop
|
|
// before upon reaching a correct mesh.
|
|
nRelaxIter 5;
|
|
|
|
// 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;
|
|
|
|
// Overall number of outer layer of iterations. Default is 1 -> all
|
|
// layers are added in one pass.
|
|
nOuterIter 3;
|
|
}
|
|
|
|
// Generic mesh quality settings. At any undoable phase these determine
|
|
// where to undo.
|
|
meshQualityControls
|
|
{
|
|
// Specify mesh quality constraints in separate dictionary so can
|
|
// be reused (e.g. checkMesh -meshQuality)
|
|
#include "meshQualityDict"
|
|
|
|
// Advanced
|
|
|
|
// Number of error distribution iterations
|
|
nSmoothScale 4;
|
|
// amount to scale back displacement at error points
|
|
errorReduction 0.75;
|
|
}
|
|
|
|
|
|
// 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;
|
|
|
|
debugFlags
|
|
(
|
|
//mesh
|
|
);
|
|
|
|
// Write flags
|
|
writeFlags
|
|
(
|
|
//layerFields // write volScalarField for layer coverage
|
|
);
|
|
|
|
// ************************************************************************* //
|