Question about CFX GGI critical situation

Anna Tian · May 11, 2013, 11:36

Hi,

If the fluid domain grids surface A need to have GGI connection to two different grids surfaces B and C (one solid and one fluid). But because of the geometry complexity, the A surface can't be split into two, so the connections with B and C can't be defined separately. But if we define GGI like A with B then A with C, we got the error message

'In Analysis 'Flow Analysis 1' - Domain Interface 'A': The location is already being used for another boundary or interface.'

.

How to deal with this critical situation?

ghorrocks · May 12, 2013, 08:16

You will have to split surface A, even if it is difficult. As you correctly point out, surface A cannot be shared on two GGIs.

JuPa · May 12, 2013, 10:41

Surely it's easy to do this if you're using ICEM and some drawing package for your geometry.

1. In your drawing package make sure surface A is split in two.
2. Import the geometry into ICEM.
3. Create two separate parts in ICEM for the surface A.
4. Export your ICEM mesh to CFX.

May 11, 2013, 11:36	Question about CFX GGI critical situation	#1
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 16	Hi, If the fluid domain grids surface A need to have GGI connection to two different grids surfaces B and C (one solid and one fluid). But because of the geometry complexity, the A surface can't be split into two, so the connections with B and C can't be defined separately. But if we define GGI like A with B then A with C, we got the error message 'In Analysis 'Flow Analysis 1' - Domain Interface 'A': The location is already being used for another boundary or interface.' . How to deal with this critical situation? __________________ Best regards, Meimei

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May 12, 2013, 08:16		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	You will have to split surface A, even if it is difficult. As you correctly point out, surface A cannot be shared on two GGIs.

May 12, 2013, 10:41		#3
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 15	Surely it's easy to do this if you're using ICEM and some drawing package for your geometry. 1. In your drawing package make sure surface A is split in two. 2. Import the geometry into ICEM. 3. Create two separate parts in ICEM for the surface A. 4. Export your ICEM mesh to CFX.