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star July 23, 2013 04:51

Importing two meshes in fluent
Hello friends. I am using Fluent 14.0. I made two meshes i.e. outer and inner domain in ICEM around airfoil. I merged both domains in ICEM and then i opened it in fluent. now the problem is the boundary between two domains. I don't know what should i consider this boundary. I made it interface but it gives error. What should i do?

agustinvo July 23, 2013 05:08

I read "merged"... When I do something like this, I use "Append case file", and after I create the grid interfaces.

I hope this helps you

star July 23, 2013 06:55

Thanks Agustin vila for your reply. You mentioned "Append case file" but i couldn't find this option in fluent. Can you elaborate a little.
Also, can I read both domains separately in fluent and merge there? I tried to read separately but the other one replaces.
If any friend can help.. thanks

agustinvo July 23, 2013 07:16

Using the Fluent Interface:

Grid -> Zone -> Append Case File
Or if you're working on a console

grid modify-zones append-mesh

star July 23, 2013 12:50

Thanks Agustin. It worked but there is another problem for me. As one boundary of both domains coincides so in fluent I made these two boundaries as interfaces but it gives me error that " unassigned interface zone detected for interface 11" and same for interface 12. Interface 11 and 12 are for these coinciding mesh boundaries. I don't know what should I do. please help

Far July 23, 2013 13:21


Mesh > Zone >  Append Case file
I would first open both meshes one by one and change units, check grid for any problem, rename any conflicting boundary and save them as .cas. After that I would open both meshes by procedure shown above.

star July 23, 2013 14:36

Mr. Sijal, I followed your procedure. i read the inner domain first and changed the boundary condition of outer boundary to interface then same procedure for outer domain and changed it's inner boundary to interface. It seemed fine but it gives the same error. When i initialize, it gives these options
WARNING: Unassigned interface zone detected for interface 11
WARNING: Unassigned interface zone detected for interface 12
Error: Init_Flow: unassigned interface_zones
interface 11 and 12 are the coinciding boundaries of two domains(which i think should be).. What should i do, please help. thanks

Far July 23, 2013 14:40

After appending both meshes, create interface by selecting both interface boundaries (upstream and downstream) before initializing simulation...

star July 24, 2013 04:12

yes it worked now. Thanks Sijal

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