<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear fellow users,<div class=""><br class=""></div><div class="">My name is Fernando Lorenzo and I am one of the maintainers of the Tochnog Finite Element analysis application (<a href="http://tochnog.sourceforge.net" class="">tochnog.sourceforge.net</a>). As some of you may or may not know, Tochnog is, just like Gmesh, an open source, very powerful and capable solver that can solve many different problem, like </div><div class=""><ul style="background-color: rgb(255, 255, 255);" class=""><li class="">Differential equations (materials)<p class="">Convection-diffusion equation:</p><p class="">- Temperature calculations.</p><p class="">Fluids:</p><p class="">- Stokes and Navier-Stokes.</p><p class="">Solids:</p><p class="">- Elasticity (isotropy and transverse isotropy).</p><p class="">- Elasto-Plasticity (Von-Mises, Mohr-Coulomb, Gurson, etc.; plasticity surfaces can be arbitrarily combined).</p><p class="">- Hypo-Plasticity (Von-Wolfersdorf, cohesion, intergranular strains, pressure dependent initial void ratio). </p><p class="">- Damage.</p><p class="">- Thermal stresses.</p><p class="">- Hypoelasticity.</p><p class="">- Viscoelasticity.</p><p class="">- Viscoplasticity.</p><p class="">- Viscosity.</p><p class="">Ground water flow equation:</p><p class="">- Storage equation.</p><p class="">Wave equation.</p></li><li class="">Accuracy information<p class="">Residues in equations can be printed/plotted.</p><p class="">Error estimates for all data (stresses, forces, temperatures, etc.)</p></li><li class="">Interaction analysis<p class="">Automatic fluid-solid interaction.</p><p class="">Temperature effects on fluids, solids.</p></li><li class="">Contact analysis<p class="">Contact with and without friction.</p><p class="">Frictional heat generation.</p></li><li class="">Frames of description<p class="">Lagrangian, Eulerian, and AEL (arbitrary Eulerian Lagrangian) calculations.</p></li></ul><div class="">Tochnog does not do magnetism and the most developed pre and post processing interface is for GiD, which, as you may already know is not free or open source. Tochnog meshing capabilities are limited for preparing complex meshes.</div><div class=""><br class=""></div><div class="">Gmsh appears to be the logical choice as it allows for geometry definitions, mesh preparation and assists with boundary condition setting, and can do some serious post-processing.</div><div class=""><br class=""></div><div class="">The idea to use Gmsh as pre and post-processor for Tochnog is not knew but no updating has taken place. We have a couple of AWK scripts to do the conversion (see attached files) that can do the conversions but are not complete. The AWK scripts were developed some years ago by Osman Buyukisik and will still ned some updating as GMSH has also been updated.</div><div class=""><br class=""></div><div class="">I will be extremely thankful if some of you with better knowledge of handling text files can assist in the updating and conversion of the files to C or C++ so that they can be built into gmsh and offer the tochnog as an option for input file preparation and to read Tochnog output to use gmsh as postrpocessor.</div><div class=""><br class=""></div><div class="">In addition to helping me keep Tochnog alive, I feel that it will expand GMSH capabilities as a source for solvers other than GetDP. </div><div class=""><br class=""></div><div class="">My contributions to Tochnog have involved updating the application, building binaries, adding the ability to use the LAPACK solver, correcting some code and helping to maintain the application. However, I believe that some of you can probably convert the attached awk scripts and help me to either build those capabilities into GMSH, or allow us Tochnog users to have an external tool that allows full use of GMSH as a free and open source pre and post processor for Tochnog.</div><div class=""><br class=""></div><div class="">Your help and assistance will be greatly appreciated.</div><div class=""><br class=""></div><div class=""></div></div></body></html>