FSI - anisotropic material

[Giacomo Creazzo]

Dear all,

I'm currently trying to assign anisotropic deformable wall material properties to my model (externally segmented starting from MRA images), but the following errors arise:

Do you have any idea what the reason might be?

I have imported my own .obj file in CRIMSON, meshed it, computed anisotropic stiffness coefficients following the "small on large" theory and the "four fibers famiy model" and assigned BC as explained in the online documentation. According to the log window I thought it was a problem related to the imported file so I have tried to change source file from an .obj to a .stl and then .vtp but nothing changed. If I assign the same BC but isotropic wall material properties to the same .obj file no error arise. Thanks in advance,

Giacomo

[cart...@gmail.com]

Hi Giacomo,

It's very hard to determine what might be causing this - I'd recommend trying with the walls configured to be rigid, to start with. Simplify as far as you can.

I'd also advise that models made in external meshing tools are often poor quality meshes which are not suitable for simulation - but one way to test for this is to confirm that it works as a rigid model.

Best,

Chris

[Giacomo Creazzo]

Hello Chris,

thanks for your answer. Before implementing the "deformable wall-anisotropic" BC I had already tested my 3D model with first a "no slip" BC and then a "deformable wall-isotropic" BC ( in two differents projects ) and they worked perfectly without any problem; so it would seem that the problem is not related to the model itself but to the fact that I'm importing it and imposing the "anisotropic-wall" BC.

That's why now I tried to segment the model using CRIMSON build-in tool and the simulation runs. 

However, I would like to export the model, modify it and then re-importing it in CRIMSON to run my simulations, is it possible?

I'm working with aneurysmatic aortic arch and I would like to co-register my 3D model to patient-specific 4D flow data and split it into 4 portions: ascending aorta, aortic arch, mid-descending aorta, descending aorta and impose different linearized stiffness coefficients each.Thanks for your help,

Giacomo