<html><body><div>Hello all,<br></div><div><br data-mce-bogus="1"></div><div>I think I found a bug related to the extrusion (and recombination) of relatively small surfaces.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>The problem occurs when you try to extrude very small 2-D cells into the third dimension while having a huge domain, like it is often necessary for a resolved boundary layer mesh for a 2-D airfoil simulation.<br> Gmsh then fails to recombine the extruded mesh into quadrangles. <br> <br> You can test this with the attached minimal example. It creates the mesh well until you uncomment the last line. You can then see in the GUI statistics-panel, that gmsh created triangles, which is obviously not intended.<br></div><div><br data-mce-bogus="1"></div><div>Please see also the related discussion at cfd-online.com:<br data-mce-bogus="1"></div><div><a href="http://www.cfd-online.com/Forums/openfoam-solving/164600-gmshtofoam-fatal-error.html">http://www.cfd-online.com/Forums/openfoam-solving/164600-gmshtofoam-fatal-error.html</a></div><div><br data-mce-bogus="1"></div><div>Best regards,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Kate<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div></body></html>