[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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[ANSYS Meshing] Using more than one meshing method on a single 2D geometry	robbierich90	ANSYS Meshing & Geometry	0	October 30, 2011 14:12
Reg difficulties in meshing the geometry...Urgent	arunraj	ANSYS Meshing & Geometry	0	August 27, 2011 00:25
[ANSYS Meshing] Help - Meshing 2 Surfaces On A 2D Geometry	Ali_M	ANSYS Meshing & Geometry	4	March 29, 2011 04:01
[snappyHexMesh] Irregular mesh generation for simple box geometry	ajl42	OpenFOAM Meshing & Mesh Conversion	0	March 7, 2011 18:04
[Other] Geometry and Meshing Questions	Flaky	ANSYS Meshing & Geometry	6	October 8, 2010 02:10

April 7, 2012, 07:50		#2
jm2011 New Member Join Date: Dec 2011 Posts: 11 Rep Power: 14	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!!!