Hello Christophe, I have addressed the issue a long time ago in the same way you described. Thanks for the response anyways.
Best, Cem On Sun, Feb 15, 2009 at 10:14 AM, Christophe Geuzaine <[email protected]>wrote: > CEM ALBUKREK wrote: > >> Hello Christophe, >> >> I have been using Gmsh successfully to build complex tet meshes as input >> to OpenFOAM. To give you a sense of the complexity attached is a picture of >> a typical surface mesh, which is an assembly of NAS and STL files combined >> into one closed volume using some scripts I developed. You have warned on >> your website that GMSH is not so good at large meshes from STL's; what >> threshold (# of tets) did you have in mind? I am able to go as far as the 32 >> bit memory allows me to at this point. May be the trick is the application >> of effective surface mesh smoothing techniques before moving onto volume >> meshing... >> >> One issue with CFD is that one can march an unsteady (varying time) >> simulation only as fast as the smallest tetrahedron allows; i.e. >> >> velocity * time_step <= tet size >> >> for each one of the tetrahedra. >> >> Sometimes small elements are unavoidable no matter how great a surface >> mesh one puts together. One way around the problem is to blindly erase the >> tetrahedra smaller than a threshold and run the flow simulation around these >> tiny blockages, which are too small to affect the bulk flow. I would like to >> implement a little sub-routine to do the same thing with GMSH. For instance >> we have the mesh quality filters for beta, gamma & theta. In a similar >> fashion I would like to put one for the size (or volume) and also be able to >> click delete. Do you see any problem with this? >> > > > Hi Cem - You could do this interactively: > > 1) select a size range for the elements in Options->Mesh->Visibility > > 2) in the mesh menu select "Delete" > > 3) select all the visible elements with the mouse (Ctrl+LeftButton to > start a rectangular selection area, LeftButton to finish) > > > > > May be FEM solvers could benefit from this kind of feature as well knowing >> tiny bubbles are not uncommon in molded plastics and cast metals. >> >> What do you think? >> >> -- >> CEM M. ALBUKREK, PhD >> Computer Aided Engineering Design Consultant >> Tel: (857) 234-1035 >> >> ------------------------------------------------------------------------ >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> gmsh mailing list >> [email protected] >> http://www.geuz.org/mailman/listinfo/gmsh >> > > > -- > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://www.montefiore.ulg.ac.be/~geuzaine<http://www.montefiore.ulg.ac.be/%7Egeuzaine> > >
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