Output patch at arbitrary position in domain

oskar · January 30, 2018, 09:28

This can probably be done in post-processing also. But I think creating the patch in pre-processing should reduce the work-steps needed to get values out afterwards.
So I basically have a domain with internal and external flow. I'm trying to get a patch placed in the internal flow section, to be able to get the massflow through the internal section. I want to run several of these with varying geometry, and plot trendlines in relation to the geometry.

At the moment I'm outputting a CAD geometry from solidworks with a .stl file. Then snappyHexMesh:ing to get the domain in one go. (outer bounds is just a simple square)
But I've never seen this type of data extraction used before.

Is there any way to create a patch at a arbitrary place, and have snappyHexMesh fit the mesh to the patch?

tomf · January 31, 2018, 06:02

Yes, you can make them faceZones. I would suggest some searching for "snappyHexMesh faceZones" to give some ideas.

Regards,
Tom

oskar · January 31, 2018, 11:43

Thanks for pointing me in the right direction Tom!
I found some threads about using faceZones from setSet and topoSet. And they seem to be exactly what I need.

However, I haven't been able to find any good basic example of how to actually do this. You wouldn't happen to have a link or a short simple description handy?

tomf · February 1, 2018, 05:54

Hi,

The excellent collection of tutorials of Tobi comes to mind. His setset part on the website may be of help?

I did not check it myself, but from the description it looks like it will cover many topics, amongst which probably yours.

Regards,
Tom

January 30, 2018, 09:28	Output patch at arbitrary position in domain	#1
oskar New Member Oskar Join Date: Mar 2009 Location: Finland Posts: 12 Rep Power: 17	This can probably be done in post-processing also. But I think creating the patch in pre-processing should reduce the work-steps needed to get values out afterwards. So I basically have a domain with internal and external flow. I'm trying to get a patch placed in the internal flow section, to be able to get the massflow through the internal section. I want to run several of these with varying geometry, and plot trendlines in relation to the geometry. At the moment I'm outputting a CAD geometry from solidworks with a .stl file. Then snappyHexMesh:ing to get the domain in one go. (outer bounds is just a simple square) But I've never seen this type of data extraction used before. Is there any way to create a patch at a arbitrary place, and have snappyHexMesh fit the mesh to the patch?

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January 31, 2018, 06:02		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 634 Rep Power: 32	Yes, you can make them faceZones. I would suggest some searching for "snappyHexMesh faceZones" to give some ideas. Regards, Tom

January 31, 2018, 11:43		#3
oskar New Member Oskar Join Date: Mar 2009 Location: Finland Posts: 12 Rep Power: 17	Thanks for pointing me in the right direction Tom! I found some threads about using faceZones from setSet and topoSet. And they seem to be exactly what I need. However, I haven't been able to find any good basic example of how to actually do this. You wouldn't happen to have a link or a short simple description handy?

February 1, 2018, 05:54		#4
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 634 Rep Power: 32	Hi, The excellent collection of tutorials of Tobi comes to mind. His setset part on the website may be of help? I did not check it myself, but from the description it looks like it will cover many topics, amongst which probably yours. Regards, Tom