[Gmsh] Boundary Layer

[Patrick Bourdin]

Hi Dave,

I just tried the BL extrusion command. Neat!
1st question: Is there any means to control the expansion ratio of the 
cells within the extruded mesh?
2nd question: How to avoid the collapsing of the upper and lower layers 
at the *sharp* trailing edge of an airfoil (see pic attached)? Ideally I 
would like to extend those layers in the wake. I tried to append a wake 
surface (in fact a wedge with a very thin apex angle) to the trailing 
edge and grow a BL mesh on it, but didn't work, I still have the same 
problem at the trailing edge. Any idea?

Cheers,

Patrick




David Colignon wrote:

>
>
> Patrick Bourdin wrote:
>
>> spot on Dave!
>>
>> my mistake indeed, there was a typo in tmp2.geo: some colons were 
>> used in lieu of commas in the transfinite line expression-lists, 
>> definitively not the intended effect, I should stop gmsh-scripting 
>> late at night ;-)
>>
>> thx again,
>>
>> Patrick
>
>
>
> De nada.
>
> Your geometry and your scripts are very nice !
>
> Do you know that we have a new _experimental_ boundary layer command :
>
> http://www.geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC36
>
>
> Extrude { Surface { expression-list }; layers }
>    Extrudes a boundary layer along the normals of the specified surfaces.
>
>
> Here is a small example (t1_boundary_layer.geo).
>
> Dave
>
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