[ICEM] Meshing an irregular geometry

Fabio Tabacow · March 2, 2012, 15:42

Hi,

I have a ""stl file" that it is a irregular geometry, and with ICEM CFD I saw that I can import this file to this software, but now, I have a problem....How can I build the mesh in my geometry????

I was reading the guide, and apears some doubts.... I need to make a surface to build the mesh or I can build the mesh only with this geometry???

sorry about the english..heheh...

Thank you!
Fabio

jm2011 · April 7, 2012, 07:50

You can use the blocking method or an unstructured mesh (eg octree) to mesh a STL surface, similar to other file formats. Just extrude the curves on the edge of the surface to create a volume if that's what you need. What do you mean by irregular though?

cdegroot · April 7, 2012, 17:01

I have meshed several stl surfaces successfully. For a complex surface (i.e. anything biomedical or resulting from some kind of scan of a physical object) your best bet is to use an Octree mesh. If you are using for CFD you should then delete the volume elements, smooth the surface mesh, and generate a Delaunay volume mesh. You can then smooth the Delaunay mesh if desired. Also, it is typically a good idea to "build topology" before you start meshing. However, for a complex surface this usually leads to a lot of curves that don't really capture any geometric features. Delete any such curves before meshing. Also delete any extraneous points.

Fabio Tabacow · July 2, 2012, 15:25

Irregular geometry in my case, is the geometry of a real artery......

I have de surface of an abdominal aortic aneurysm..... I will try to do what you said.....

I built the topology to have some curves and points, and all curves and points have the same part of the surface.........How can I move this curves for the new part that I created?

Thank you for the help!!!

Fabio Tabacow · July 2, 2012, 15:34

The geometry that I'm working at is the picture that I attached...

Azy · May 7, 2014, 16:58

Quote:

Originally Posted by cdegroot

I have meshed several stl surfaces successfully. For a complex surface (i.e. anything biomedical or resulting from some kind of scan of a physical object) your best bet is to use an Octree mesh. If you are using for CFD you should then delete the volume elements, smooth the surface mesh, and generate a Delaunay volume mesh. You can then smooth the Delaunay mesh if desired. Also, it is typically a good idea to "build topology" before you start meshing. However, for a complex surface this usually leads to a lot of curves that don't really capture any geometric features. Delete any such curves before meshing. Also delete any extraneous points.

you know, I saw the same as you described in the manual. I tried it out many times and it didn't work. but the way you said it, it works! thanks alot

cdegroot · May 7, 2014, 17:03

That's great. I'm glad it worked for you!

Quote:

Originally Posted by Azy

you know, I saw the same as you described in the manual. I tried it out many times and it didn't work. but the way you said it, it works! thanks alot

March 2, 2012, 15:42	Meshing an irregular geometry	#1
Fabio Tabacow New Member Fabio Tabacow Join Date: Feb 2012 Posts: 4 Rep Power: 14	Hi, I have a ""stl file" that it is a irregular geometry, and with ICEM CFD I saw that I can import this file to this software, but now, I have a problem....How can I build the mesh in my geometry???? I was reading the guide, and apears some doubts.... I need to make a surface to build the mesh or I can build the mesh only with this geometry??? sorry about the english..heheh... Thank you! Fabio

April 7, 2012, 17:01		#3
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 18	I have meshed several stl surfaces successfully. For a complex surface (i.e. anything biomedical or resulting from some kind of scan of a physical object) your best bet is to use an Octree mesh. If you are using for CFD you should then delete the volume elements, smooth the surface mesh, and generate a Delaunay volume mesh. You can then smooth the Delaunay mesh if desired. Also, it is typically a good idea to "build topology" before you start meshing. However, for a complex surface this usually leads to a lot of curves that don't really capture any geometric features. Delete any such curves before meshing. Also delete any extraneous points. Azy likes this.

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April 7, 2012, 07:50		#2
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 15	You can use the blocking method or an unstructured mesh (eg octree) to mesh a STL surface, similar to other file formats. Just extrude the curves on the edge of the surface to create a volume if that's what you need. What do you mean by irregular though?

July 2, 2012, 15:25		#4
Fabio Tabacow New Member Fabio Tabacow Join Date: Feb 2012 Posts: 4 Rep Power: 14	Irregular geometry in my case, is the geometry of a real artery...... I have de surface of an abdominal aortic aneurysm..... I will try to do what you said..... I built the topology to have some curves and points, and all curves and points have the same part of the surface.........How can I move this curves for the new part that I created? Thank you for the help!!!