CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Meshing & Mesh Conversion

Grid quatlity for particle tracking

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   June 12, 2015, 06:07
Default Grid quatlity for particle tracking
  #1
New Member
 
Hoarau Yannick
Join Date: Mar 2009
Posts: 24
Rep Power: 9
yhoarau is on a distinguished road
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
Attached Files
File Type: txt snappyHexMeshDict.txt (9.7 KB, 2 views)
yhoarau is offline   Reply With Quote

Old   June 16, 2016, 07:36
Default
  #2
Senior Member
 
Mojtaba.a's Avatar
 
Mojtaba Amiraslanpour
Join Date: Jun 2011
Location: Zanjan, Iran
Posts: 287
Rep Power: 8
Mojtaba.a is on a distinguished road
Send a message via Skype™ to Mojtaba.a
Quote:
Originally Posted by yhoarau View Post
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?
__________________
Learn OpenFOAM in Persian for free, And ask your questions here.
Complex Heat & Flow Simulation Research Group
If you can't explain it simply, you don't understand it well enough. "Richard Feynman"
Mojtaba.a is offline   Reply With Quote

Old   June 16, 2016, 08:11
Default
  #3
New Member
 
Hoarau Yannick
Join Date: Mar 2009
Posts: 24
Rep Power: 9
yhoarau is on a distinguished road
Hi

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

Old   June 16, 2016, 08:42
Default
  #4
Senior Member
 
Mojtaba.a's Avatar
 
Mojtaba Amiraslanpour
Join Date: Jun 2011
Location: Zanjan, Iran
Posts: 287
Rep Power: 8
Mojtaba.a is on a distinguished road
Send a message via Skype™ to Mojtaba.a
Quote:
Originally Posted by yhoarau View Post
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.
__________________
Learn OpenFOAM in Persian for free, And ask your questions here.
Complex Heat & Flow Simulation Research Group
If you can't explain it simply, you don't understand it well enough. "Richard Feynman"
Mojtaba.a is offline   Reply With Quote

Old   June 16, 2016, 08:46
Default
  #5
New Member
 
Hoarau Yannick
Join Date: Mar 2009
Posts: 24
Rep Power: 9
yhoarau is on a distinguished road
YEP if you have ICEM then te-meshes are OK.
Hexa grid is much more complicated.
yhoarau is offline   Reply With Quote

Old   June 19, 2016, 08:05
Default
  #6
Senior Member
 
Join Date: Jan 2010
Location: Stuttgart
Posts: 146
Rep Power: 8
Chrisi1984 is on a distinguished road
Hello,

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

Kind regards
Chrisi
Chrisi1984 is offline   Reply With Quote

Old   June 19, 2016, 08:26
Default
  #7
New Member
 
Hoarau Yannick
Join Date: Mar 2009
Posts: 24
Rep Power: 9
yhoarau is on a distinguished road
Hi

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

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ubuntu 12.10 + openfoam2.2.0 ==> paraview error message peteryuan OpenFOAM Installation 6 August 18, 2013 18:00
ParaView ErrOr soheil nazmdeh OpenFOAM Paraview & paraFoam 1 August 17, 2013 07:40
Grid Adaptation Suresh FLUENT 0 October 15, 2003 13:18
GRID TO GRID INTERPOLATION in FLUENT calogero FLUENT 3 June 4, 2003 08:32
Numerical methods for discontinuous grid interfaces? Hansong Hang Main CFD Forum 12 September 16, 1998 22:26


All times are GMT -4. The time now is 01:37.