[Gmsh] detect negative jacobians

[Christophe Geuzaine]

> On 24 Mar 2016, at 19:06, Christophe Geuzaine <cgeuzaine at ulg.ac.be> wrote:
> 
>> 
>> On 24 Mar 2016, at 12:27, Bernd Hahnebach <gmsh at b75.ch> wrote:
>> 
>> 
>> What is the recommended way to avoid such negative jacobians? Attached the geometry of the mesh above.
>> 

And to avoid such negative jacobians, you can use the "High order tools" (in the Mesh menu). This is still experimental, but works quite well. The algorithms are described (in part) in 

T. Toulorge, C. Geuzaine, J.-F. Remacle, J. Lambrechts. Robust untangling of curvilinear meshes. Journal of Computational Physics 254, pp. 8-26, 2013. http://gmsh.info/doc/preprints/gmsh_untangling_preprint.pdf

Christophe


-- 
Prof. Christophe Geuzaine
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