Re: [vmtk-users] RE : VMTK Mesh Problem

[Luca A. <luc...@or...>]

Great. Thanks a lot, Florian.

Luca

On 01/mag/2013, at 14:39, "Joly Florian" <flo...@um...> wrote:

> Hi,
> In ICEM look at the aorta tutorial, there is the whole explanation on how to split the surface by angle to get the inlet/outlets (same process on StarCCM+ or OpenFOAM by the way. ICEM can also generate boundary layer cells.
> 
> Regards,
> 
> 
> Florian 
> 
> -------- Message d'origine--------
> De: Luca Antiga [mailto:luc...@or...]
> Date: mer. 5/1/2013 08:36
> À: Vincent Ip
> Cc: vmt...@li...
> Objet : Re: [vmtk-users] VMTK Mesh Problem
> 
> Hi Vincent,
> 
> On May 1, 2013, at 6:49 AM, Vincent Ip wrote:
> 
>> Dear VMTK users,
>> 
>> I encounter a situation that when I export the surface to STL format and trying to mesh it with ANSYS ICEM.
>> I cannot define the inlet and outlet as they are incorporated into the wall (the whole thing).
>> Is there anything I should do besides clipping and capping before exporting the surface to STL format?
> 
> I don't use ICEM so I'm not sure of what's the best way to go here. Unfortunately STL doesn't support the definition of 
> surface region indicators associated to either points or cells, so I guess there should be a way to do something like
> this within ICEM.
> 
> Any ICEM users out there that can help out?
> 
>> The second problem is that I had repeated crashing when I try to mesh it with VMTK and this happen whenever I add the boundary layer.
>> The vessel geometry I got is a segment from ICA siphon segment to M2 and it is extracted from Time-of-flight MRA. It does appear to be a bit bumpy in appearance, probably due to its low resolution, so I'm not sure if this could be the problem. Or if I need a very powerful computer to run the VMTK??
> 
> FYI, there's new robust boundary layer code coming up in vmtk in the near future.
> 
> Having said that, the old code shouldn't crash (in the worst case it generates elements with negative Jacobian here and there).
> Are you sure you are generating a mesh with a good density? If you generate very coarse meshes the mesh itself could degenerate 
> during the remeshing phase. Just a thought.
> 
> In any case, feel free to send your model over and I'll take a look as soon as I can.
> 
> Best,
> 
> Luca
> 
> 
>> Please kindly comment.
>> 
>> Thanks,
>> Vincent
>> 
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> 
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