363 lines
10 KiB
C++
363 lines
10 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
|
|
| ========= | |
|
|
| \\ / F ield | foam-extend: Open Source CFD |
|
|
| \\ / O peration | Version: 3.2 |
|
|
| \\ / A nd | Web: http://www.foam-extend.org |
|
|
| \\/ M anipulation | |
|
|
\*---------------------------------------------------------------------------*/
|
|
FoamFile
|
|
{
|
|
version 2.0;
|
|
format ascii;
|
|
class dictionary;
|
|
object autoHexMeshDict;
|
|
}
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
// Which of the steps to run
|
|
castellatedMesh true;
|
|
snap true;
|
|
addLayers false;
|
|
|
|
// Geometry. Definition of all surfaces. All surfaces are of class
|
|
// searchableSurface.
|
|
// Surfaces are used
|
|
// - to specify refinement for any mesh cell intersecting it
|
|
// - to specify refinement for any mesh cell inside/outside/near
|
|
// - to 'snap' the mesh boundary to the surface
|
|
geometry
|
|
{
|
|
bottomAir.stl
|
|
{
|
|
type triSurfaceMesh;
|
|
name bottomAir;
|
|
}
|
|
|
|
topAir.stl
|
|
{
|
|
type triSurfaceMesh;
|
|
name topAir;
|
|
}
|
|
|
|
leftSolid.stl
|
|
{
|
|
type triSurfaceMesh;
|
|
name leftSolid;
|
|
}
|
|
|
|
rightSolid.stl
|
|
{
|
|
type triSurfaceMesh;
|
|
name rightSolid;
|
|
}
|
|
|
|
heater.stl
|
|
{
|
|
type triSurfaceMesh;
|
|
name heater;
|
|
}
|
|
|
|
//refinementBox
|
|
//{
|
|
// type searchableBox;
|
|
// min (-0.3 -0.4 -0.1);
|
|
// max ( 3.0 0.4 1.4);
|
|
// }
|
|
};
|
|
|
|
// Settings for the castellatedMesh generation.
|
|
castellatedMeshControls
|
|
{
|
|
|
|
// Refinement parameters
|
|
// ~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
// While refining maximum number of cells per processor. This is basically
|
|
// the number of cells that fit on a processor. If you choose this too small
|
|
// it will do just more refinement iterations to obtain a similar mesh.
|
|
maxLocalCells 1000000;
|
|
|
|
// 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 10;
|
|
|
|
// Number of buffer layers between different levels.
|
|
// 1 means normal 2:1 refinement restriction, larger means slower
|
|
// refinement.
|
|
nCellsBetweenLevels 2;
|
|
|
|
// Explicit feature edge refinement
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
// Specifies a level for any cell intersected by its edges.
|
|
// This is a featureEdgeMesh, read from constant/triSurface for now.
|
|
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
|
|
{
|
|
bottomAir
|
|
{
|
|
// Surface-wise min and max refinement level
|
|
level (1 1);
|
|
|
|
faceZone bottomAir;
|
|
cellZone bottomAir;
|
|
zoneInside true;
|
|
}
|
|
|
|
topAir
|
|
{
|
|
// Surface-wise min and max refinement level
|
|
level (1 1);
|
|
|
|
faceZone topAir;
|
|
cellZone topAir;
|
|
zoneInside true;
|
|
}
|
|
|
|
heater
|
|
{
|
|
// Surface-wise min and max refinement level
|
|
level (0 0);
|
|
|
|
faceZone heater;
|
|
cellZone heater;
|
|
zoneInside true;
|
|
}
|
|
|
|
leftSolid
|
|
{
|
|
// Surface-wise min and max refinement level
|
|
level (1 1);
|
|
|
|
faceZone leftSolid;
|
|
cellZone leftSolid;
|
|
zoneInside true;
|
|
}
|
|
|
|
rightSolid
|
|
{
|
|
// Surface-wise min and max refinement level
|
|
level (1 1);
|
|
|
|
faceZone rightSolid;
|
|
cellZone rightSolid;
|
|
zoneInside true;
|
|
}
|
|
}
|
|
|
|
// Resolve sharp angles
|
|
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
|
|
// descending 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
|
|
{
|
|
//refinementBox
|
|
//{
|
|
// mode inside;
|
|
// levels ((1E15 4));
|
|
//}
|
|
}
|
|
|
|
// 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 locationInMesh is kept.
|
|
// NOTE: This point should never be on a face, always inside a cell, even
|
|
// after refinement.
|
|
locationInMesh (0.01 0.01 0.01);
|
|
}
|
|
|
|
// Settings for the snapping.
|
|
snapControls
|
|
{
|
|
//- Number of patch smoothing iterations before finding correspondence
|
|
// to surface
|
|
nSmoothPatch 3;
|
|
|
|
//- Relative distance for points to be attracted by surface feature point
|
|
// or edge. True distance is this factor times local
|
|
// maximum edge length.
|
|
tolerance 4.0;
|
|
|
|
//- 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
|
|
{
|
|
relativeSizes true;
|
|
|
|
// Per final patch (so not geometry!) the layer information
|
|
layers
|
|
{
|
|
//flowAirDuctReagent_flowAirDuctReagent
|
|
//{
|
|
// nSurfaceLayers 1;
|
|
//}
|
|
//flowAirDuctReagent_inlet1
|
|
//{
|
|
// nSurfaceLayers 1;
|
|
//}
|
|
//flowAirDuctReagent_inlet2
|
|
//{
|
|
// nSurfaceLayers 1;
|
|
//}
|
|
}
|
|
|
|
// 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.
|
|
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.
|
|
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.
|
|
nGrow 0;
|
|
|
|
// Advanced settings
|
|
|
|
//- When not to extrude surface. 0 is flat surface, 90 is when two faces
|
|
// make straight angle.
|
|
featureAngle 30;
|
|
|
|
//- Maximum number of snapping relaxation iterations. Should stop
|
|
// before upon reaching a correct mesh.
|
|
nRelaxIter 3;
|
|
|
|
// 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
|
|
minMedianAxisAngle 130;
|
|
|
|
// Create buffer region for new layer terminations
|
|
nBufferCellsNoExtrude 0;
|
|
}
|
|
|
|
// 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;
|
|
|
|
//- 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 projected area v.s. actual area. Set to -1 to disable.
|
|
minFlatness 0.5;
|
|
|
|
//- Minimum pyramid volume. Is absolute volume of cell pyramid.
|
|
// Set to very negative number (e.g. -1E30) to disable.
|
|
minVol 0;
|
|
|
|
//- 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
|
|
minTwist 0.02;
|
|
|
|
//- minimum normalised cell determinant
|
|
//- 1 = hex, <= 0 = folded or flattened illegal cell
|
|
minDeterminant 0.001;
|
|
|
|
//- minFaceWeight (0 -> 0.5)
|
|
minFaceWeight 0.02;
|
|
|
|
//- minVolRatio (0 -> 1)
|
|
minVolRatio 0.01;
|
|
|
|
//must be >0 for Fluent compatibility
|
|
minTriangleTwist -1;
|
|
|
|
// Advanced
|
|
|
|
//- Number of error distribution iterations
|
|
nSmoothScale 4;
|
|
//- amount to scale back displacement at error points
|
|
errorReduction 0.75;
|
|
}
|
|
|
|
// Advanced
|
|
|
|
// Flags for optional output
|
|
// 0 : only write final meshes
|
|
// 1 : write intermediate meshes
|
|
// 2 : write volScalarField with cellLevel for postprocessing
|
|
// 4 : write current intersections as .obj files
|
|
debug 0;
|
|
|
|
// Merge tolerance. Is fraction of overall bounding box of initial mesh.
|
|
// Note: the write tolerance needs to be higher than this.
|
|
mergeTolerance 1E-6;
|
|
|
|
// ************************************************************************* //
|