CFD Online URL
[Sponsors]
Home > Forums > OpenFOAM

snappyHexMesh

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 7, 2009, 15:01
Default snappyHexMesh
  #1
New Member
 
Join Date: Sep 2009
Posts: 17
Rep Power: 7
tachyon_me is on a distinguished road
I'm running snappyHexMesh for a complex model which takes really long iterating back and forth for meeting all the mesh quality criteria.

meshQualityControls
{
maxNonOrtho 75;
maxBoundarySkewness 30;
maxInternalSkewness 4;
maxConcave 85;
minFlatness 0.5;
minVol 1e-13;
minArea -1;
minTwist 0.05;
minDeterminant 0.001;
minFaceWeight 0.025;
minVolRatio 0.01;
minTriangleTwist 0.05;
nSmoothScale 4;
errorReduction 0.75;


I would like to speed up the meshing process. Please let me know your opinion if anything can be done to speed up meshing.

another things I would like to do the volume mesh fixing. Once I get the final mesh checkMesh utility pop up some bad cells >200 , Is there any way I can delete the bad cells before I run the solver or create the patch.

checkMesh utility i guess outputs the faces as warped etc ... I know i can bring out the cell attached with those faces with
faceToCell any / ....

Once I have all those bad cell in a set file How to operate them on the final mesh written 3/
Cell c0 delete .....

Finally My goal is to get the mesh without any of those bad cells.

Highly appreciate any help ...
tachyon_me is offline   Reply With Quote

Old   October 7, 2009, 19:49
Default
  #2
Senior Member
 
santos's Avatar
 
Jose Luis Santos
Join Date: Mar 2009
Location: Portugal
Posts: 212
Rep Power: 8
santos is on a distinguished road
Send a message via Skype™ to santos
You could speed up your meshing process by running sHM in parallel (I normally run it on 4 CPUs).

Regards,
Jose Santos
santos is offline   Reply With Quote

Old   October 7, 2009, 20:54
Default
  #3
New Member
 
Join Date: Sep 2009
Posts: 17
Rep Power: 7
tachyon_me is on a distinguished road
Thanks ! I have been running parallel...

I see some kind of cell count boosts compared to other meshing tools ... I'm not 100% sure but I guess for similar kind of surface meshing and extrusion layer set up.... snappyHexMesh generates huge number of cells ....

Do u have any idea if I can fix the mesh after taking out the cells which normally pop up in checkMesh utility...
tachyon_me is offline   Reply With Quote

Old   October 8, 2009, 11:10
Default
  #4
Senior Member
 
santos's Avatar
 
Jose Luis Santos
Join Date: Mar 2009
Location: Portugal
Posts: 212
Rep Power: 8
santos is on a distinguished road
Send a message via Skype™ to santos
I am sorry but I dont have any experience on how to do that. Maybe you could increase your mesh quality parameters in snappyHexMeshDict so you dont end up with those bad cells.

Regards,
Jose Santos
santos 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
Question about mesh produced by snappyHexMesh bigphil OpenFOAM Native Meshers: snappyHexMesh and Others 11 March 26, 2010 22:35
SnappyHexMesh samiam1000 OpenFOAM 0 October 5, 2009 11:32
Problem with snappyHexMesh samiam1000 OpenFOAM 0 October 3, 2009 06:08
SnappyHexMesh andresbh OpenFOAM 0 August 5, 2009 10:22
SnappyHexMesh not generate mesh first time mavimo OpenFOAM Mesh Utilities 4 August 26, 2008 08:08


All times are GMT -4. The time now is 11:25.