Grid quatlity for particle tracking
 

Hi,

I have to perform a particle tracking in a blood micro vessel network. I have an stl file for the geometry and I build the grid with snappyHexmesh. My grid is OK for the flow but not for the particles :
--> FOAM FATAL ERROR:
No base point for face 1854708, 4(894291 917963 919857 916949), produces a decomposition that has a minimum volume greater than tolerance.


I tried many unsuccessful combination in snappyHexMeshDict which I join here.
Can someone tell me which parameters I have to modify to generate a nice grid?

Thanks

Yannick

Have you find anything about this? Its really a strange and annoying error.
Do you know how to change the tolerance mentioned in the error?

Hi

No i was not able to fix this issue, I tried many grid generation but so faar nothing is working!

Ok I made a similar mesh in an another software (ANSYS ICEM CFD) and it worked just fine.
I guess SHM has some problems and produces low quality tet meshes.

YEP if you have ICEM then te-meshes are OK.
Hexa grid is much more complicated.

Hello,

regarding this topic I recommend you to read the following thread:
http://www.cfd-online.com/Forums/ope...mposition.html

Kind regards
Chrisi

Hi

Thanks Chrisi, this post gives idea on why the grid is not OK but unfortunately not how to fix the problem.