mesh generation help

mobius · August 26, 2010, 12:01

I am a new STAR-CCM+ user. I have a large model that I'm am trying to get a surface and volume mesh on, but the surface mesh generator keeps cutting off one end of the model and adding holes, kind of like someone had a field day with a chainsaw. I think it's doing this because that section is where two components gradually come together, so the cross section of the space between the parts would look like a long skinny triangle. That geometry continues around the entire top of the model. I've tried tweaking the mesh settings, but have not found a way to mesh up into the small corner. That's really the only trouble spot, everything else seems to mesh fine. Any suggestions would be appreciated. Thanks

Tron · August 27, 2010, 03:10

Did you create "Feature Curves" for your regions?

Christian

karthickeyan · August 27, 2010, 05:01

u can eliminate this problem by reducing mesh size(if it possible) or create feature curve

mobius · August 27, 2010, 15:38

Thanks for the suggestions.

Tron: The regions do have feature curves defining the boundaries but it will not mesh up to the feature curves.

karthickeyan: I have tried finer meshs, some extend further up into the region and some don't for some reason. This is a large model, so I don't want too fine of a mesh beceuase that will increase the computation time. I think we once tried to do a fine mesh on just the region we are trying to fix, but it had issues connecting that to the rest of the model which had a bit courser mesh.

Vinicius · August 27, 2010, 17:10

Split the faces that are in touch in 2 boundaries and customize the mesh values for both. Use the min and target with the same value (for example 50% for both). Also, if it doesn´t help, disable the automatic surface repair and see what happens.

Are you using surface wrapper?

karthickeyan · August 30, 2010, 02:19

for each boundary u can customize the mesh size so upload snap shot of ur problem

mobius · September 11, 2010, 18:20

So far I have tried all the suggestions and still can't get a good mesh up into the corner. I got a new higher fidelity model to play with, in an STL format, and I can't even get that to remesh or surface wrap or anything. Sorry, I can not upload any pictures or my model, I can only describe the geometry generically.

August 26, 2010, 12:01	mesh generation help	#1
mobius New Member Join Date: Aug 2010 Posts: 7 Rep Power: 16	I am a new STAR-CCM+ user. I have a large model that I'm am trying to get a surface and volume mesh on, but the surface mesh generator keeps cutting off one end of the model and adding holes, kind of like someone had a field day with a chainsaw. I think it's doing this because that section is where two components gradually come together, so the cross section of the space between the parts would look like a long skinny triangle. That geometry continues around the entire top of the model. I've tried tweaking the mesh settings, but have not found a way to mesh up into the small corner. That's really the only trouble spot, everything else seems to mesh fine. Any suggestions would be appreciated. Thanks

August 27, 2010, 03:10	feature curves missing?	#2
Tron New Member Christian Jungreuthmayer Join Date: Mar 2009 Posts: 9 Rep Power: 17	Did you create "Feature Curves" for your regions? Christian

August 27, 2010, 05:01	reduce mesh size or create feature curve	#3
karthickeyan Member karthickeyan Join Date: Feb 2010 Location: coimbatore Posts: 36 Rep Power: 16	u can eliminate this problem by reducing mesh size(if it possible) or create feature curve

August 30, 2010, 02:19	try this	#6
karthickeyan Member karthickeyan Join Date: Feb 2010 Location: coimbatore Posts: 36 Rep Power: 16	for each boundary u can customize the mesh size so upload snap shot of ur problem

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August 27, 2010, 15:38		#4
mobius New Member Join Date: Aug 2010 Posts: 7 Rep Power: 16	Thanks for the suggestions. Tron: The regions do have feature curves defining the boundaries but it will not mesh up to the feature curves. karthickeyan: I have tried finer meshs, some extend further up into the region and some don't for some reason. This is a large model, so I don't want too fine of a mesh beceuase that will increase the computation time. I think we once tried to do a fine mesh on just the region we are trying to fix, but it had issues connecting that to the rest of the model which had a bit courser mesh.

August 27, 2010, 17:10		#5
Vinicius Member Vinicius Girardi Join Date: Mar 2009 Location: Sao Paulo, Brazil Posts: 80 Rep Power: 17	Split the faces that are in touch in 2 boundaries and customize the mesh values for both. Use the min and target with the same value (for example 50% for both). Also, if it doesn´t help, disable the automatic surface repair and see what happens. Are you using surface wrapper?

September 11, 2010, 18:20		#7
mobius New Member Join Date: Aug 2010 Posts: 7 Rep Power: 16	So far I have tried all the suggestions and still can't get a good mesh up into the corner. I got a new higher fidelity model to play with, in an STL format, and I can't even get that to remesh or surface wrap or anything. Sorry, I can not upload any pictures or my model, I can only describe the geometry generically.