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December 12, 2011, 09:25 |
How to use Interior BC?
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#1 |
New Member
Join Date: Dec 2009
Location: Italy
Posts: 23
Rep Power: 16 |
Dear all,
I am meshing an air nozzle inside a gas pipe for CFD analysis. I want to have two separate domains for the nozzle and the pipe, and I can get this through blocking. But when I define the INTERIOR boundary condition at the interface between the two domains (i.e., where the nozzle exits into the pipe), I get the following error in Fluent "Inappropriate zone type for one-sided face zone. Changing to wall" I guess this happens becasue I have two overlapping meshes - if I display node numbers, there are overlapping nodes at the nozzle exit - obtained when meshing separately the two domains. Is there any way to merge the two domains? I already tried with nodes merging but it does not work - the error in Fluent is "Cannot change nozzle_outlet to interior because there is only one adjacent cell thread" How to overcome this? Please help! Thank you very much, SerSe |
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December 13, 2011, 08:18 |
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#2 |
New Member
Join Date: Dec 2009
Location: Italy
Posts: 23
Rep Power: 16 |
I managed in defining two domains divided by interior BC with following steps in ICEM
- Construction of geometry - Construction of blocks - Definition of pre-mesh - Creation of a new part from blocks (this new part from blocks is the new domain "AIR" - the rest of the blocks constitute the other domain "GAS") - Conversion of pre-mesh to unstructured mesh (two domains are present, but unconnected) - Check of the mesh (errors are reported because cells at the interface between the domains are not referred to any edge) - Fix such problem (ICEM automatically creates elements at the interface, these elements have to belong to a new part "INTERIOR") - The BC INTERIOR can be assigned to the part "INTERIOR" The mesh file thus generated is readable by Fluent! Regards, Serse |
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