[Gmsh] Problem with boundary layer on 2D flat plate

[ashish bhole]

Dear Guillaume Dilasser,

Thank you Guillaume for quick and explanatory reply. Transfinite algorithm
will not produce orthogonal mesh in case of complex shape like airfoil. I
was doing flat plate case as an exercise. Now it is clear that for complex
geometries I will have to do something else. Can you please provide
guidance on the same?

-- With Regards
Ashish Bhole


On Tue, Jul 19, 2016 at 1:49 PM, DILASSER Guillaume <
Guillaume.DILASSER at cea.fr> wrote:

> Dear Ashish,
>
>
>
> The shape of the boundary layer you get is due to the fact that
> BoundaryLayer fields do not overwrite the 1D mesh of the edges that do not
> appear in Field.EdgesList. Now, in your case if you do add Lines 3 and 5 to
> EdgesList, it would solve your problem at the corners 1001 and 1002 but
> also create a layer near to edges 3 and 5 and I understand this is not what
> you want.
>
>
>
> The key to get what you want is to make sure the 1D mesh on the lines
> orthogonal to the BoundaryLayers is compatible with it, i.e. it needs to be
> refined close to line 2. As it doesn’t seem really easy to do, I would
> suggest you don’t use Fields to implement the BoundaryLayers but rather the
> transfinite algorithm. The enclosed file gives you a way to do it. It will
> work for simple geometries like the one you proposed but for more complex
> surfaces you would probably need something else.
>
>
>
> Sincerely Yours,
>
>
>
> Guillaume DILASSER
>
> Doctorant SACM / LEAS
>
> CEA - Centre de Saclay - Bât.123 - PC 319c
>
> 91191 Gif sur Yvette Cedex - France -
>
>
>
> guillaume.dilasser at cea.fr
>
>
>
>
>
>
>
> *De :* gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] *De la part
> de* ashish bhole
> *Envoyé :* lundi 18 juillet 2016 19:40
> *À :* gmsh at onelab.info
> *Objet :* [Gmsh] Problem with boundary layer on 2D flat plate
>
>
>
> Hi,
>
> I have attached a geo script for mesh on 2D flat plate. I want to create
> boundary layer over flat plate without use of transfinite feature, as I
> want unstructured mesh outside boundary layer.
>
>
> I am not able to use Boundary layer feature properly. I have commented
> those lines in script. Can someone help me getting boundary layer correct?
>
> -- With Regards
>
> Ashish Bhole
>
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