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November 1, 2013, 06:38 |
fail adding layers
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#1 |
Senior Member
James
Join Date: May 2013
Posts: 116
Rep Power: 13 |
Hi everyone,
I am making my first steps in snHM and I am getting crazy. Two things I donīt understand: 1. Which parameters have I to play with to preserve planes from my stl geometry in the final mesh generated by snappy? At first I increased nSmoothPatch, but doesnīt worked. I have a geometry with two plane inlets and one plane outlet and I guess it is good to preserve it. I donīt want to modify so much my stl because itīs a small geometry (so little changes can let to false simulation results...) 2.How about addLayers? I saw in the forum that a lot of people have problems with this issue (me too). I want to make the same thickness of the first layer all over the domain close to the wall, so -relativeSizes=false -expansionRatio=1.5 -finalLayerThickness=1e-05 (I computed it from BL theory) -minThickness=1e-06 (a value lower than first layer thickness) Is this OK? Snappy is not doing anything with those settings. Should I play with feature angle or ngrow?Or maybe the problem is meshQualityCOntrols (maybe the quality requirements are too high so donīt allow the creation of layers, I set it to the default values of 20,4 and 2 for maxNonOrth,maxBoundarySk and maxInternalSk). I can attach many logs (I am making a lot of meshes by trial and error) if its needed. Any help will be really much appreciated (I switched to sHM from Engrid because it crashes my stl geometry in same cases, due to the sharp issues...and now I am stuck with sHM too ) |
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