[Gmsh] Gmsh 2D Boundary Layer around a bluff body

[cgeuzaine at uliege.be]

You’ll need the very latest automated build for this to work (3.0.7 git)

CG

> On 26 Feb 2018, at 11:13, Marie-Claire Le Pape <marie-claire.le_pape at onera.fr> wrote:
> 
> Hello,
> 
> No farfield grid has been created with the .geo file (see .png file and .geo file) (I've used Mesh/Define/2D). However the farfield is created if commands relative to the boundary layer are in comments. But perhaps it is a question of gmsh version (2.13.0) ?
> 
> Remark : when I save the grid containing only the boundary layer into a .p3d file, this .p3d file is empty. that means that the grid is not a "ijk structured" grid.
> 
> In the NACA0012 .geo file, I create a "hybrid" grid (eg unstructured+ijk structured) without using boundary layer gmsh capability. I save the grid both into a .p3d file (then only the structured part is saved), and into a .msh file (then all the grid       is considered as unstructured). To have only the farfield grid, I comment lines concerning the structured part and I save the grid into .msh file. A preprocessing outside gmsh is necessary to identify connections between both grids.
> Marie-Claire 
> 
>> Le 24/02/2018 à 11:15, Christophe Geuzaine a écrit :
>> 
>> 
>>> On 23 Feb 2018, at 09:28, Tommaso Pascon <pascon.tommaso at yahoo.it> wrote:
>>> 
>>> Good morning,
>>> 
>>> I'm Tommaso Pascon a Openfoam CFD user who use Gmsh as a mesh generator software.
>>> 
>>> I'm having troubles trying to get an hybrid mesh with a structured boundary layer area around a bluff body and an unstructured region for the rest of my domain.
>>> 
>> 
>> See e.g. https://gitlab.onelab.info/gmsh/gmsh/blob/master/benchmarks/2d/BL2.geo
>> 
>> 
>>> I tried with boudarylayer field but i can't make it to work apparently so i decided to use the extrusion function. This is working but i can't connect the structured region with the unstructured one. It seems that these two aren't connected together and the unstructured mesh falls into the structured part.
>>> 
>>> What am I missing? I've read a lot of posts on that matter but I still can't find a solution.
>>> If it's needed I can upload the geo file
>>> 
>>> Thanks
>>> 
>>> 
>>> Tommaso Pascon 
>>> 
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>> 
>> — 
>> Prof. Christophe Geuzaine
>> University of Liege, Electrical Engineering and Computer Science 
>> http://www.montefiore.ulg.ac.be/~geuzaine
>> 
>> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>> 
>> 
>> 
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> 
> <mesh.png>
> <bl.geo>
> <naca0012.geo>
> <naca0012.p3d>
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