Capability of PyGEM

[BilalAnwar165]

Hi,

i am looking for good volume mesh deformers based on the morphed surface mesh. I have a mesh (let's suppose a wing) enclosed by a volume domain. The mesh is unstructured (Tri/tetra elements) with an inflation layer (quad/penta elements) near the boundary of wing to capture the viscous layer. I am dealing with a higher dimensional Shape Optimization problem. The optimizer will provide the updated design variables of the wing in each iteration. The mesh deformer will update the surface mesh and the volume mesh. I want to ask Can pyGEM deal with such a mesh? The mesh is a OpenFoam Mesh.

Thanks in advance

[andreamola]

Hi Bilal, I think in the past we have done what you want to do, using PyGeM. Basically, what you need to do is placing a set of RBF source points on the surface mesh you are deforming (which could be an stl triangulation or the boundary mesh of OpenFOAM). You then use the RBF interpolation to propagate the wall deformation inside the three dimensional domain. This has worked for us in the past on OpenFOAM grids. Just make sure you play a bit with the RBF parameters (the radius in particular) and to use an adequate, but not excessive, amount of RBF source points on the surfaces. Let me know if you have any other questions Andrea

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On Wed, Oct 23, 2024 at 9:33 AM BilalAnwar165 ***@***.***> wrote: Hi, i am looking for good volume mesh deformers based on the morphed surface mesh. I have a mesh (let's suppose a wing) enclosed by a volume domain. The mesh is unstructured (Tri/tetra elements) with an inflation layer (quad/penta elements) near the boundary of wing to capture the viscous layer. I am dealing with a higher dimensional Shape Optimization problem. The optimizer will provide the updated design variables of the wing in each iteration. The mesh deformer will update the surface mesh and the volume mesh. I want to ask Can pyGEM deal with such a mesh? The mesh is a OpenFoam Mesh. Thanks in advance — Reply to this email directly, view it on GitHub <#273>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACDMNNDSGJEMYUJIMEH6SULZ45GN5AVCNFSM6AAAAABQOERGAOVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZXGM2TMMBVGM> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[BilalAnwar165]

Thank you @andreamola for the reply. A couple of more questions I would like to ask, and it would be of great help if you can answer them, please.

1. Using PyGEM can I create a FFD box of arbitrary shape? or may be provide points of the box in Plot3D format? for example, I would like to create a wing fitted FFD box. The wing is tapered and swept wing.

2. Is the PyGEM openfoam version specific? Can I use PyGEM with OpenFoam ESI version 2206? Also can it write the deformed mesh back to Openfoam format?

3. Can PyGEM handle the prism layers specifically?

P.S: I only want to use PyGEM as a backbox for mesh deformation!

I thank you for your help and cooperation!

Regards
Bilal