[ICEM] Export refined mesh to fluent

Heleen · March 21, 2012, 08:43

Dear all,

For my MSc thesis for my study Applied Physics I'm modeling a carotid artery.
My predecessor created nice hexagonal mehses.
Now it's my job to refine those meshes to achieve grid-independent results.

I succeeded to refine the mesh in ICEM with the function "refine all mesh" in "adjust mesh density" in the "edit mesh" tab.
However, when I try to export it to Ansys Fluent, I get the warning that there are uncovered faces and then ICEM becomes not-responding.
It does write a ...msh file, but ICEM nor Gambit nor Fluent is able to read it.

Does anybody know what the problem could be?
Are there other file-types that ICEM could export and which can be read by Fluent or Gambit?

Some more info:
I only have a mesh, no geometry.
The original mesh is created in GridPro.
The mesh doesn't contain blocking

Your help will be appreceated!

Heleen

rikio · March 21, 2012, 10:23

Before outputing a mesh, always check for errors and possible problems. Some errors, like uncovered faces, could be detected and fixed at this stage. Did you go through it?

Heleen · March 22, 2012, 11:35

Thanks for your fast reply!

I tried that today, but it caused a lot of extra problems. When checking the mesh ICEM told me that about 80% of my volumes have uncovered faces. If I try to fix that, ICEM becomes non-respondive.

So I tried to do the same with a smaller mesh. It worked for a mesh (just a simple cylinder) with 33,304 cells. ICEM fixed the unmeshed faces, but when checking again I got a lot of multiple nodes. I chose to create a subset, export it to Fluent and that works, although Fluent gives a notion that the number of nodes doesn't correspond to the listed number of nodes.

Then I tried to refine that cylinder and it got about 400,000 cells. When I checked it and let ICEM fix the uncovered faces, it became not-responding again.

It could be the multiple nodes error, so my first question is:
1: what should or can I do about those multiple nodes? I have about eight-thousand of them, so removing them manually is not an option.

My second guess is that the mesh is to large for my computer. On the other hand, I managed to let ICEM read a mesh with 1,5 milion cells, so I can hardly imagine that the memory is the problem. So my second question is:
2: How can I check if it is a memory problem?

Many thanks!

Heleen

Far · March 22, 2012, 14:34

create geometry in ICEM, otherwise it is almost impossible to do as you want.

Heleen · March 26, 2012, 05:13

Thanks for the encouragement to make my mesh in ICEM. First I didn't want to because I thought it'd take me a lot of extra time, but the failing attempts to refine the mesh take much time as well.

So thanks a lot!

Heleen

Far · March 26, 2012, 05:15

If original mesh was created in gridpro, why don't you just open gridpro and refine it?

Heleen · March 26, 2012, 05:49

Would be a great idea, but there is no license for Gridpro anymore. The only meshing programmes with license are Gambit and Gridpro.

From the Gridpro-user I have some topology-files (extensions .fra, .sch and .tria), some mesh-files (.msh) and some other files (.stl, .neu).

Could I import a topology into ICEM?

Far · March 26, 2012, 05:52

How many blocks are there in Gridpro file? If less than 250, you can try trail version.

Far · March 26, 2012, 08:33

Gridpro link for free academia 250 block
http://shop.gridpro.com/section/5810

Another better idea would be to build the topo in ICEM from the pics of gridpro file.

March 21, 2012, 08:43	Export refined mesh to fluent	#1
Heleen New Member Heleen D Join Date: Mar 2012 Posts: 5 Rep Power: 14	Dear all, For my MSc thesis for my study Applied Physics I'm modeling a carotid artery. My predecessor created nice hexagonal mehses. Now it's my job to refine those meshes to achieve grid-independent results. I succeeded to refine the mesh in ICEM with the function "refine all mesh" in "adjust mesh density" in the "edit mesh" tab. However, when I try to export it to Ansys Fluent, I get the warning that there are uncovered faces and then ICEM becomes not-responding. It does write a ...msh file, but ICEM nor Gambit nor Fluent is able to read it. Does anybody know what the problem could be? Are there other file-types that ICEM could export and which can be read by Fluent or Gambit? Some more info: I only have a mesh, no geometry. The original mesh is created in GridPro. The mesh doesn't contain blocking Your help will be appreceated! Heleen

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March 21, 2012, 10:23		#2
rikio Senior Member Rikio Join Date: Mar 2009 Location: SH, China Posts: 182 Blog Entries: 1 Rep Power: 17	Before outputing a mesh, always check for errors and possible problems. Some errors, like uncovered faces, could be detected and fixed at this stage. Did you go through it?

March 22, 2012, 11:35		#3
Heleen New Member Heleen D Join Date: Mar 2012 Posts: 5 Rep Power: 14	Thanks for your fast reply! I tried that today, but it caused a lot of extra problems. When checking the mesh ICEM told me that about 80% of my volumes have uncovered faces. If I try to fix that, ICEM becomes non-respondive. So I tried to do the same with a smaller mesh. It worked for a mesh (just a simple cylinder) with 33,304 cells. ICEM fixed the unmeshed faces, but when checking again I got a lot of multiple nodes. I chose to create a subset, export it to Fluent and that works, although Fluent gives a notion that the number of nodes doesn't correspond to the listed number of nodes. Then I tried to refine that cylinder and it got about 400,000 cells. When I checked it and let ICEM fix the uncovered faces, it became not-responding again. It could be the multiple nodes error, so my first question is: 1: what should or can I do about those multiple nodes? I have about eight-thousand of them, so removing them manually is not an option. My second guess is that the mesh is to large for my computer. On the other hand, I managed to let ICEM read a mesh with 1,5 milion cells, so I can hardly imagine that the memory is the problem. So my second question is: 2: How can I check if it is a memory problem? Many thanks! Heleen

March 22, 2012, 14:34		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,554 Blog Entries: 6 Rep Power: 54	create geometry in ICEM, otherwise it is almost impossible to do as you want.

March 26, 2012, 05:13		#5
Heleen New Member Heleen D Join Date: Mar 2012 Posts: 5 Rep Power: 14	Thanks for the encouragement to make my mesh in ICEM. First I didn't want to because I thought it'd take me a lot of extra time, but the failing attempts to refine the mesh take much time as well. So thanks a lot! Heleen

March 26, 2012, 05:15		#6
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,554 Blog Entries: 6 Rep Power: 54	If original mesh was created in gridpro, why don't you just open gridpro and refine it?

March 26, 2012, 05:49		#7
Heleen New Member Heleen D Join Date: Mar 2012 Posts: 5 Rep Power: 14	Would be a great idea, but there is no license for Gridpro anymore. The only meshing programmes with license are Gambit and Gridpro. From the Gridpro-user I have some topology-files (extensions .fra, .sch and .tria), some mesh-files (.msh) and some other files (.stl, .neu). Could I import a topology into ICEM?

March 26, 2012, 05:52		#8
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,554 Blog Entries: 6 Rep Power: 54	How many blocks are there in Gridpro file? If less than 250, you can try trail version.

March 26, 2012, 08:33		#9
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,554 Blog Entries: 6 Rep Power: 54	Gridpro link for free academia 250 block http://shop.gridpro.com/section/5810 Another better idea would be to build the topo in ICEM from the pics of gridpro file.