[Gmsh] anisotropic 2D mesh at face boundary

[Jean-Francois Remacle]

Have you tryed gmsh -algo bamg ?
Le 14 janv. 2011 à 15:43, Steffè Walter a écrit :

> Hello
>  
>   I have just seen about the possibility of specifying a boundary layer as a special type of Field.
> So I have started to experiment with it in order to compress the boundary triangles towards contour normal.
> The BoundaryLayer is based on an Attractor which refers to all the edges in my miodel.
> I have specified:
>    blayer->options[“hwall_t”]->numericalValue(meshsize);
>    blayer->options[“hwall_n”]->numericalValue(meshsize/1.5);
>    blayer->options[“hfar”]->numericalValue(meshsize);
>    CTX::instance()->mesh.anisoMax=2;
>    CTX::instance()->mesh.smoothratio=1.05;
>  
> Unfortunately I can not get the kind of mesh I am looking for.
> The mesh is influenced by these parameters but it never becomes really anisotropic.
>  
> I have also looked inside the BoundaryLayerField code to understand how the metric is generated.
> To me it is quite obscure the mechanism for retrieving the edge tangent.
>   std::pair<AttractorInfo,SPoint3> pp=cc->getAttractorInfo();
>   GEdge *e=GModel:current()->getEdgeByTag(pp.first.ent):
> is it the edge which is closer to the given point (x,y,z) or is just the first edge in the Attractor EdgeList ?
>  
> The edge tangent is used to define the direction of hwall_t and should be related with the nearest edge.
>  
> May you please give me a hint on the way to follow in order to define a metric that is able to strech the boundary
> triangles in the contour direction or, which is the same, to compress them in the normal direction.
>  
>  
> Thanks in advance
> Walter Steffè
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------------------------------------------------------------------
Prof. Jean-Francois Remacle
Universite catholique de Louvain (UCL)
Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering
Institute of Mechanics, Materials and Civil Engineering (iMMC)
Center for Systems Engineering and Applied Mechanics (CESAME)
Tel : +32-10-472352 -- Mobile : +32-473-909930 

 





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