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[snappyHexMesh] proble of creating layers with snappyHexMesh |
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June 10, 2015, 12:04 |
proble of creating layers with snappyHexMesh
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#1 |
Member
Zhiyi Li
Join Date: Mar 2015
Location: Germany
Posts: 43
Rep Power: 11 |
Dear All,
I pretty new with snappyHexMesh. I just finish the central part refinement of the cyclone, which is attached here. But does anyone know how should I add inflation layers to it? I used this in snappyHexMeshDIct, but it is not working: addLayers 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; // Per final patch (so not geometry!) the layer information layers { cyclone.stl_walls { nSurfaceLayers 3; } } // Expansion factor for layer mesh expansionRatio 1.1; // 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 0.5; // 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. // Note: changed(corrected) w.r.t 17x! (didn't do anything in 17x) nGrow 1; // 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 5; // 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; } Thank you Best Regards Litchy |
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June 18, 2015, 07:43 |
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#2 |
Senior Member
Join Date: Mar 2015
Posts: 250
Rep Power: 12 |
Hello,
inflation layers are boundary layers, right? What is the error message you get? Best regards, Kate |
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June 18, 2015, 09:00 |
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#3 | |
Member
Zhiyi Li
Join Date: Mar 2015
Location: Germany
Posts: 43
Rep Power: 11 |
Quote:
Yes, inflation layer is boundary layer. There is no error message, simply no inflation layer created, just like the step 2 (snapping). Right now I get the inflation layers somehow, I guess I was not setting the inflation part correctly, so It did not recognize it. Thank you for your reply Best Rrgards Litchy |
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May 24, 2018, 06:18 |
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#4 |
Senior Member
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Hi Litchy,
I know, it is an old thread but may be useful for someone else. I think, the problem with you patch name layers { cyclone.stl_walls { nSurfaceLayers 3; } } "cyclone.stl_walls", it should be you patch name, instead of .stl file name Regards |
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cyclone, inflation layer, snappyhexmesh |
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