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How to hex mesh geometry in STL format?
Hi,
I have geometry in the STL format, and I would like to hex mesh it. Has any done this before, starting from a STL and finishing with a hex mesh? Any advice would be much appreciated, Philip |
Hi Philip,
Have you tried snappyHexMesh? It does exactly what you need. Have a look in the User Guide to see how it can be used. Regards, Jose Santos |
Hi Jose,
I read through snappyHexMesh in the manual. Is it possible to use snappyHexMesh for meshing the geometry itself, as apposed to around the geometry like in the snappyHesMesh example? I have a femur (thigh bone) which I would like to mesh. Thanks for you reply, If snappyHexMesh suits, that would be great! Philip |
Yes, its possible. You need to define the locationInMesh point in the region you are interested in, ie, inside the femur in you case.
Regards, Jose Santos |
Jose,
That's great. I didn't realise I could use snappyHexMesh to hex mesh objects. I shall head off now, and try to learn snappyHexMesh. Thanks very much for the advice, it is much appreciated. Best Regards, Philip :) |
Hi, Jose,
Now I am facing a weird problem. I am going to hex mesh the flow field in a screw extruder. I blockMeshed the barrel back ground . it worked. I then tried to snappyHexMesh the field between the screw and the barrel. I defined the location in mesh , but when I run sHM, it always exited with saying: Point (x x x) is not inside the mesh or on a face or edge. Bounding box of the mesh:(-13.1 -13.1 0) (13.1 13.1 197) I tried several point , even though I pretend to mesh the area inside the screw. it does so also. I have tried to avoid the point on the face or edge. I can not solve the problem. Would you give me some hint? Thank you. Wendy |
Make sure the dimensions of blockMesh and STL meshes are consistent (eg. m or mm). Its hard to help without extra info on your mesh!
Regards, Jose Santos |
Now the problem is, when I run sHM, it stops with the error information:
#0 Foam::error::printStack(Foam::Ostream&) in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: [0xb8076400] #3 Foam::meshRefinement::markSurfaceCurvatureRefineme nt(double, int, Foam::List<int> const&, Foam::Field<Foam::Vector<double> > const&, Foam::List<int>&, int&) const in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libautoMesh.so" #4 Foam::meshRefinement::refineCandidates(Foam::Vecto r<double> const&, double, Foam::PtrList<Foam::featureEdgeMesh> const&, Foam::List<int> const&, bool, bool, bool, bool, int, int) const in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libautoMesh.so" #5 Foam::autoRefineDriver::surfaceOnlyRefine(Foam::re finementParameters const&, int) in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libautoMesh.so" #6 Foam::autoRefineDriver::doRefine(Foam::dictionary const&, Foam::refinementParameters const&, bool) in "/home/xhw/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libautoMesh.so" #7 main in "/home/xhw/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/snappyHexMesh" #8 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6" #9 Foam::regIOobject::writeObject(Foam::IOstream::str eamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType) const in "/home/xhw/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/snappyHexMesh" Floating point exception I am considering if it is caused by shortage of memory space? Thank you. Wendy |
I just tried another simpler case. it is just a cylinder inside a bigger rectangular container.
when sHM for several iterations, it stoped with information: killed. no sHM results created. Anybody has such experience? Thank you. Wendy |
sHM , refinement level
I modified refinement level , it worked finally.
but what is the problem that it works well with lower level and doesn't work with higher level? I still want to get better mesh so I would prefer higher refinement level. Many thanks to any advice. Wendy |
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