On 20 Aug 2012, at 17:50, Andres Gonzalez Estrada <[email protected]> wrote:
> Does anyone have a clue about how gmsh interpret the characteristic lenght?. > The problem has been described before in several post with no successful > reply, e.g.: > Hi Jo - it's the length of mesh edges. Christophe > > Jö Fahlke > > > jorrit at jorrit.de > > > > Mon Feb 14 16:31:08 CET 2011 > > > I can think of several meanings for "characteristic length" (or "elements > size" for that matter): > > * The length of the mesh elements' edges, > * the cubic root of the mesh elements' volume, > * the diameter of the circumscribed sphere of the mesh elements, or > * the radius of the circumscribed sphere of the mesh elements. > > There are probably more possibilities. What I want to know is whether gmsh > follows a one consistent meaning for the characteristic length, and if yes, > which one. > > (More accurately, I want to limit the edge sizes in the grid, an I suspect the > characteristic length can be used for that, but I can't figure out how > exactly. The obvious approach of "max characteristic length" == "max edge > size" did not work, see my first mail.) > > Am Mon, 14. Feb 2011, 15:49:58 +0100 schrieb David Colignon: > > > do a search with the keyword "characteristic" on this page: > https://geuz.org/gmsh/doc/texinfo/gmsh.html > > > > > > and/or see > > http://geuz.org/gmsh/doc/texinfo/gmsh.html#Specifying-mesh-element-sizes > > I did, but I could not find an answer to the above question. The closest to > an explanation of the meaning of the characteristic length was > > | > Every meshing step is constrained by a “size field” (sometimes called > > | > “characteristic length field”), which prescribes the desired size of the > > | > elements in the mesh. > > > (from section 1.2 "Mesh: finite element mesh generation"), which links the > characteristic length to the mesh element size, but does not explain how the > mesh element size is measured or how exactly it is linked to the > characteristic length. > > Thanks, > Jö. > > -- > -- > Octavio Andrés González Estrada > Research Associate > Institute of Mechanics and Advanced Materials > Cardiff School of Engineering > Cardiff University > The Parade > Cardiff CF24 3AA, Wales, UK > > Email: > [email protected] > > > [email protected] > _______________________________________________ > 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 _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
