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-   -   [ICEM] How to export Icem mesh to Cfx? (http://www.cfd-online.com/Forums/ansys-meshing/113563-how-export-icem-mesh-cfx.html)

darazsbence February 21, 2013 18:11

How to export Icem mesh to Cfx?
 
Hi everyone!

My problem is quite simple but i'm new to Icem so i have difficulties only. Anyway, i created a 2d mesh in Icem and i want to use it Cfx but i cannot manage to output it.

I always get an error messege that says: "no volume elements found.child process exited abnormally".

I tried to extrude the mesh by one layer only as my simulation would be 2D but i got the same error again.

Thanks in advance

mjgraf February 21, 2013 21:23

CFX requires 3 elements thick i believe

search the forum there is a description and I also think a tip about export to fluent, importing that into Pre and it does it automatically?????

Quote:

Originally Posted by darazsbence (Post 409410)
Hi everyone!

My problem is quite simple but i'm new to Icem so i have difficulties only. Anyway, i created a 2d mesh in Icem and i want to use it Cfx but i cannot manage to output it.

I always get an error messege that says: "no volume elements found.child process exited abnormally".

I tried to extrude the mesh by one layer only as my simulation would be 2D but i got the same error again.

Thanks in advance


flotus1 February 22, 2013 05:06

Ansys CFX has no 2D Solver. Fluent on the other hand does...
CFX requires a volume mesh with at least ONE cell in the direction of symmetry. ICEM can extrude your 2D mesh to 3D.

darazsbence February 22, 2013 08:25

First, thank you guys for the quick answers, i really do appreciate them.

Unfortunatly, i have to use cfx for solving my assignement, fluent is not good for me. The other thing: how to create a 3d mesh from a 2d mesh? I created a 2d geometry then the blocks and the mesh, all this in 2d. After this, a selected extrude mesh and extruded it. I thought this would result in a volume mesh but as it apperas it wouldn't. Please help me out. Thank you again.

jrunsten February 22, 2013 08:30

You can export a 2d mesh to fluent format (msh). When imported to cfx it will automatically extrude it one element for you

Far February 22, 2013 09:37

Export as .msh (Fluent mesh) and import into CFX-Pre. You will get the mesh one element extruded by CFX for you.

Or you can extrude mesh in edit mesh tab. Convert pre-mesh to unstructured mesh and use edit mesh tab.

darazsbence February 22, 2013 10:16

I got it working, thanks everyone.

Another problem came up: when i imported the cfx5 file into cfx-pre and i tried to determine boundary conditions i cannot select any of the surfaces, i only have one thing to choose, it's called: Primitive 2d. Is it possible that in icem i somehow create surfaces that actually appear in cfx-pre and i can select them as inlet, outlet, wall etc. ?

Huge thanks to every one of you.

Far February 22, 2013 10:53

You should be able to select the boundaries in CFX-Pre. I guess it is not possible to export boundary conditions from ICEM to CFX.

darazsbence February 22, 2013 11:50

When i create the cfx5 file i got this messege in the log:
"WARNING : family SOLID has mixed of 2D and 3D elements, this is not allowed in CFX-5.". Do you have any idea what problem can it cause and how can i help it? Thank you.

Far February 22, 2013 12:22

re-name solid to Fluid and try...

darazsbence February 22, 2013 13:10

Doesn't work.

I also tried something else:
I started cfx from workbench and created the geometry in mechanical. After that i started meshing and inserted mesh method then selected uniform quad, and switched write icem cfd file to interactive. After all of this i created the mesh in icem and converted pre-mesh to unstructured mesh at the end. Even so when i close icem, in workbench meshing i'm stuck with the old mesh. How can i preserve the mesh i created in icem?

I really don't know what to do.

Thank you.

flotus1 February 23, 2013 15:09

Quote:

Originally Posted by darazsbence (Post 409556)
When i create the cfx5 file i got this messege in the log:
"WARNING : family SOLID has mixed of 2D and 3D elements, this is not allowed in CFX-5.". Do you have any idea what problem can it cause and how can i help it? Thank you.


Sounds like you need to delete the remaining 2D mesh...


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