wall geometry and mesh for FSI

[Tasos Raptis]

Hello Lucas,

I would  like to ask you a couple of questions since i have recently started to work with FSI problems. The difficult part is the preparation of the geometry and specifically, i need a mesh for the fluid, which is easily generated by vmtk, and a separate mesh for the wall. It is important for the solid part that the internal and the external surfaces, but also the ring surfaces at the inlets and outlets (the subtraction of the extended and the initial cap surfaces) are distinguished so that the boundary conditions can be applied. The internal surface must also be common between the solid and the fluid.

In a previous post, i found the following pype:

vmtksurfacenormals -ifile foo.vtp --pipe vmtksurfacetomesh --pipe vmtkboundarylayer -warpvectorsarray Normals -numberofsublayers 2 -constantthickness 1 -thickness 0.1 -ofile foo.vtu

which returns a mesh for the wall without however distinguishing the surfaces. Additionally, the application of the vmtkmeshboundaryinspector script returns an error when trying to inspect the mesh entities.

I also tried the vmtkmeshaddexternallayer script, which generates an external surface but doesn't seem to produce a thick mesh for the wall (there is a gap between the internal and external surfaces). The fluid part seems also to remain a part of the resulting mesh.

I attach two figures that might help you understand what i mean.

I know that my requirements might be exorbitant, but do you have any ideas how can i approach the problem?

Best regards,

Tasos 

[Elena Faggiano]

Hello Tasos,

I have implemented a script in vmtk that does exactly what you are searching for.

The script will be soon in vmtk but if you need it I can send it privately.

Please contact me in private.

Elena

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Elena Faggiano, PhD

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Computational Mechanics & Advanced Materials Group,

http://www-2.unipv.it/compmech/index.html
Department of Civil Engineering and Architecture,
University of Pavia,
via Ferrata 3, 27100 Pavia, Italy

phone: +39-0382-985016

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[Evan Kao]

Hello Elena,

I am also interested in producing a wall mesh for FSI simulations using vmtk instead of commercial software.  Would it be possible for me to obtain a copy of your script as well?

Thanks for your time,

Evan

[Adelaide de Vecchi]

Hello Elena,

I am also trying to generate meshes for coupled simulations. If I understand correctly, your script allows the creation of a mesh (say the solid one) that is conforming to the mesh it should be coupled to, ie.e the fluid one. I have been trying to mesh the two surfaces so that the nodes on the interface are coincident but was not successful. Could you please share your FSI script (which I suppose does something similar) or point me in the right direction?

Many thanks!

Adelaide 

[Svensen7]

Hello Elena,

I've also try to prepare a mesh for FSI simulations. Are you already added your script into VMTK ? Would you share this script to me ?

Thanks

[Svensen7]

Hello Elena,

It seems that your script is not added to VMTK yet. Could you send it to me privately ?