Hi Dave, Thanks a for your reply.
Here's my actual use case: two (or more) cuboids stacked up to form a big layered cuboid. The big cuboid should be periodic. Each intermediate surface will have a different characteristic lengthscale, and the characteristic lengthscale of the connecting surfaces should change smoothly. Can this be achieved? Cheers, Aleksejs On 14.12.2016 15:29, David Colignon wrote: > > On 14/12/16 14:22, Aleksejs Fomins wrote: > >> Dear Gmsh, >> >> I would like to create a cubic domain with a few complicated 3D shapes >> inside, and produce a corresponding tetrahedral mesh. The domain boundaries >> of the cube should be periodically conformal, e.g. each triangle on the >> surface with normal -x should be equivalent to a triangle on the surface >> with normal +x under translation along the x-axis. >> >> Using google I have found a solution proposed earlier on this list: >> >> http://onelab.info/pipermail/gmsh/2016/010305.html >> >> The .geo code suggested in the above link produces a conformal tetrahedral >> mesh of a cube using Transfinite surfaces and edges. It seems to work, but >> has a few problems: >> 1) It completely ignores the value of the characteristic lengthscale >> variable "lc", always splitting each edge in exactly 4 parts >> 2) The characteristic lengthscale changes depending on when index number of >> the Transfinite Line. Currently it is 5. If one would set it to 14, each >> edge would be split into exactly 25 segments. Why is that? > > Hi, > > see http://gmsh.info/doc/texinfo/gmsh.html#Structured-grids > > Transfinite Line { expression-list } | "*" = expression < Using Progression | > Bump expression >; > > Selects the lines in expression-list to be meshed with the 1D transfinite > algorithm. The expression on the right hand side gives the number of nodes > that will be created on the line (this overrides any other mesh element size > prescription—see Specifying mesh element sizes). > > > 5 nodes -> four segments > > Regards, > > Dave > _______________________________________________ gmsh mailing list [email protected] http://onelab.info/mailman/listinfo/gmsh
