1 /*--------------------------------*- C++ -*----------------------------------*\
3 | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
4 | \\ / O peration | Version: 1.6 |
5 | \\ / A nd | Web: http://www.OpenFOAM.org |
6 | \\/ M anipulation | |
7 \*---------------------------------------------------------------------------*/
13 object snappyHexMeshDict;
15 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
17 // Which of the steps to run
23 // Geometry. Definition of all surfaces. All surfaces are of class
26 // - to specify refinement for any mesh cell intersecting it
27 // - to specify refinement for any mesh cell inside/outside/near
28 // - to 'snap' the mesh boundary to the surface
33 type searchableSphere;
47 type searchableSurfaceCollection;
79 type searchableSurfaceCollection;
112 // Settings for the castellatedMesh generation.
113 castellatedMeshControls
116 // Refinement parameters
117 // ~~~~~~~~~~~~~~~~~~~~~
119 // While refining maximum number of cells per processor. This is basically
120 // the number of cells that fit on a processor. If you choose this too small
121 // it will do just more refinement iterations to obtain a similar mesh.
122 maxLocalCells 1000000;
124 // Overall cell limit (approximately). Refinement will stop immediately
125 // upon reaching this number so a refinement level might not complete.
126 // Note that this is the number of cells before removing the part which
127 // is not 'visible' from the keepPoint. The final number of cells might
128 // actually be a lot less.
129 maxGlobalCells 2000000;
131 // The surface refinement loop might spend lots of iterations refining just a
132 // few cells. This setting will cause refinement to stop if <= minimumRefine
133 // are selected for refinement. Note: it will at least do one iteration
134 // (unless the number of cells to refine is 0)
135 minRefinementCells 100;
137 // Number of buffer layers between different levels.
138 // 1 means normal 2:1 refinement restriction, larger means slower
140 nCellsBetweenLevels 1;
144 // Explicit feature edge refinement
145 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
147 // Specifies a level for any cell intersected by its edges.
148 // This is a featureEdgeMesh, read from constant/triSurface for now.
152 file "fridgeA.eMesh";
159 // Surface based refinement
160 // ~~~~~~~~~~~~~~~~~~~~~~~~
162 // Specifies two levels for every surface. The first is the minimum level,
163 // every cell intersecting a surface gets refined up to the minimum level.
164 // The second level is the maximum level. Cells that 'see' multiple
165 // intersections where the intersections make an
166 // angle > resolveFeatureAngle get refined up to the maximum level.
172 // Surface-wise min and max refinement level
177 // Region-wise override
187 // Surface-wise min and max refinement level
192 // Resolve sharp angles on fridges
193 resolveFeatureAngle 60;
196 // Region-wise refinement
197 // ~~~~~~~~~~~~~~~~~~~~~~
199 // Specifies refinement level for cells in relation to a surface. One of
201 // - distance. 'levels' specifies per distance to the surface the
202 // wanted refinement level. The distances need to be specified in
204 // - inside. 'levels' is only one entry and only the level is used. All
205 // cells inside the surface get refined up to the level. The surface
206 // needs to be closed for this to be possible.
207 // - outside. Same but cells outside.
217 // After refinement patches get added for all refinementSurfaces and
218 // all cells intersecting the surfaces get put into these patches. The
219 // section reachable from the locationInMesh is kept.
220 // NOTE: This point should never be on a face, always inside a cell, even
222 locationInMesh (3 0.28 0.43);
227 // Settings for the snapping.
230 //- Number of patch smoothing iterations before finding correspondence
234 //- Relative distance for points to be attracted by surface feature point
235 // or edge. True distance is this factor times local
236 // maximum edge length.
239 //- Number of mesh displacement relaxation iterations.
242 //- Maximum number of snapping relaxation iterations. Should stop
243 // before upon reaching a correct mesh.
249 // Settings for the layer addition.
254 // Per final patch (so not geometry!) the layer information
267 // Expansion factor for layer mesh
270 //- Wanted thickness of final added cell layer. If multiple layers
272 // thickness of the layer furthest away from the wall.
273 // Relative to undistorted size of cell outside layer.
274 finalLayerThickness 0.5;
276 //- Minimum thickness of cell layer. If for any reason layer
277 // cannot be above minThickness do not add layer.
278 // Relative to undistorted size of cell outside layer.
281 //- If points get not extruded do nGrow layers of connected faces that are
282 // also not grown. This helps convergence of the layer addition process
283 // close to features.
289 //- When not to extrude surface. 0 is flat surface, 90 is when two faces
290 // make straight angle.
293 //- Maximum number of snapping relaxation iterations. Should stop
294 // before upon reaching a correct mesh.
297 // Number of smoothing iterations of surface normals
298 nSmoothSurfaceNormals 1;
300 // Number of smoothing iterations of interior mesh movement direction
303 // Smooth layer thickness over surface patches
306 // Stop layer growth on highly warped cells
307 maxFaceThicknessRatio 0.5;
309 // Reduce layer growth where ratio thickness to medial
311 maxThicknessToMedialRatio 0.3;
313 // Angle used to pick up medial axis points
314 minMedianAxisAngle 130;
316 // Create buffer region for new layer terminations
317 nBufferCellsNoExtrude 0;
319 // Overall max number of layer addition iterations
325 // Generic mesh quality settings. At any undoable phase these determine
329 //- Maximum non-orthogonality allowed. Set to 180 to disable.
332 //- Max skewness allowed. Set to <0 to disable.
333 maxBoundarySkewness 20;
334 maxInternalSkewness 4;
336 //- Max concaveness allowed. Is angle (in degrees) below which concavity
337 // is allowed. 0 is straight face, <0 would be convex face.
338 // Set to 180 to disable.
341 //- Minimum projected area v.s. actual area. Set to -1 to disable.
344 //- Minimum pyramid volume. Is absolute volume of cell pyramid.
345 // Set to very negative number (e.g. -1E30) to disable.
348 //- Minimum face area. Set to <0 to disable.
351 //- Minimum face twist. Set to <-1 to disable. dot product of face normal
352 //- and face centre triangles normal
355 //- minimum normalised cell determinant
356 //- 1 = hex, <= 0 = folded or flattened illegal cell
357 minDeterminant 0.001;
359 //- minFaceWeight (0 -> 0.5)
362 //- minVolRatio (0 -> 1)
365 //must be >0 for Fluent compatibility
371 //- Number of error distribution iterations
373 //- amount to scale back displacement at error points
380 // Flags for optional output
381 // 0 : only write final meshes
382 // 1 : write intermediate meshes
383 // 2 : write volScalarField with cellLevel for postprocessing
384 // 4 : write current intersections as .obj files
388 // Merge tolerance. Is fraction of overall bounding box of initial mesh.
389 // Note: the write tolerance needs to be higher than this.
393 // ************************************************************************* //