[snappyHexMesh] stl file with internal faces

mihaipruna · June 21, 2012, 15:57

Hello fellow Foamists!

You have been most helpful so far. I really like this forum.
Let's say I have an STL file with two pipes that are modeled as cylinders, and they can be intersecting or abutting. Please see attached image.
I would like to model internal flow through the pipe. I have the outlet and inlet defined as the big circle and the small circle on the other side.
SnappyHexMesh meshes only one of the cylinders.
Is there a way to make it mesh inside the entire outer surface and ignore internal faces?
Probably too much to ask, eh ?

I currently don't have a way to remove the offending faces from the STL file.

wyldckat · June 21, 2012, 17:14

Hi Mihai,

Check the tutorial "mesh/snappyHexMesh/snappyMultiRegionHeater". But keep in mind that this means that you'll have multiple regions in you mesh!

Some examples on this subject:

This can help a bit with understanding the meshing logic about using multi-regions: http://www.cfd-online.com/Forums/ope...oth-parts.html
This can help you with issues of excess regions of multi-regions: http://www.cfd-online.com/Forums/ope...omain-cht.html

But keep in mind: this does not get rid of the internal walls! To get rid of internal walls and merge all of the regions... I'm not certain how to do this. Perhaps the second post might help you with this, since I vaguely remember about removing an excess region...

Best regards,
Bruno

mihaipruna · June 21, 2012, 20:49

Thanks Bruno, I will check those out. I figured getting rid of the patches would be the main issue...

kalyangoparaju · July 24, 2012, 13:32

Mihai,

were you able to successfully mesh this geometry? how did you go about it?

Kalyan

June 21, 2012, 17:14		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,974 Blog Entries: 45 Rep Power: 128	Hi Mihai, Check the tutorial "mesh/snappyHexMesh/snappyMultiRegionHeater". But keep in mind that this means that you'll have multiple regions in you mesh! Some examples on this subject: This can help a bit with understanding the meshing logic about using multi-regions: http://www.cfd-online.com/Forums/ope...oth-parts.html This can help you with issues of excess regions of multi-regions: http://www.cfd-online.com/Forums/ope...omain-cht.html But keep in mind: this does not get rid of the internal walls! To get rid of internal walls and merge all of the regions... I'm not certain how to do this. Perhaps the second post might help you with this, since I vaguely remember about removing an excess region... Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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June 21, 2012, 20:49		#3
mihaipruna Senior Member Mihai Pruna Join Date: Apr 2010 Location: Boston Posts: 195 Rep Power: 16	Thanks Bruno, I will check those out. I figured getting rid of the patches would be the main issue...

July 24, 2012, 13:32		#4
kalyangoparaju Member Kalyan Join Date: Oct 2011 Location: Columbus, Ohio Posts: 53 Blog Entries: 1 Rep Power: 14	Mihai, were you able to successfully mesh this geometry? how did you go about it? Kalyan