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[snappyHexMesh] problems resolving small mesh |
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September 21, 2020, 13:05 |
problems resolving small mesh
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Senior Member
Franco
Join Date: Nov 2019
Location: Compiègne, France
Posts: 129
Rep Power: 7 |
hello,
I am looking for some help with snappyHex or if someone can see another problem from a previous step. I need to mesh really small geometries with small repetitive internal structures (3mm3) ( the total bounding box is (-1.0842e-19 -9.2767e-19 -1.38778e-17) (0.00505 0.00505 0.201133)) for the background mesh, I use blockMesh with cubic cells and a cell size of 0.002 (also tried 0.001/0.0015/0.0025). For the geometry itself, I triangulate it with salome with NETGEN 2D and wire discretization and local lenght of 5e-05 (i tried also 2.5e-5). for the snappyHex the castelated controls where: maxLocalCells 2000000 maxGlobalCells 13000000 level ref (1 1) (tried 2 2, 3 3, 4 4, 5 5 and 6 6) for the howl region. for the snapControls: nSmoothPatch 5 (also 7) tolerance 2 nSolveIter 300 (also 350) nRelaxIter 4 (also 8) nFeatureSnapIter 30 (also 100) and with explicitFeatureSnap on. snappyHexDict: snappyHexMeshDict.txt the feature detection works correctly see attached pictures... the issues I am having is that the snapp of the geometry to go at least similar in a "look" i need to go at least up to level 5 5 of refiment, but when i do this the checking mesh bigings to give errors (higher the level the more face error i am facing): non-orthogonality > 65 degrees :170 and faces with face pyramid volume < 1e-13: around 20000000 for the best results. I am adding the results from the surfaceCheck of the stl and also the checkMesh -allGeometry -allTopology surfaceCheck.txt checkMesh.txt I know that it is a proble of size of the geometry itself.. but I need really need to mesh this geometry as they idea is to compare it with experimental results so any help would be apreciated image link: https://i.ibb.co/5s6wtKz/text885.png any guidance/help or pointing in a direction would be appreciate it. Last edited by otaolafr; September 21, 2020 at 14:14. |
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Tags |
check mesh, ilegal faces, salome meshing, snappyhexmesh 3d |
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