CFX Mesh interfaces

saisanthoshm88 · April 14, 2011, 15:22

Can some one please explain why a GGI interface is preferred for Fluid-solid and solid-solid connections in CFX rather than the one-to-one interface

ghorrocks · April 15, 2011, 08:04

Because a GGI uses full 2-way coupling between the domains but a 1to1 only uses 1-way coupling. A GGI will probably converge faster. Not sure but they may have fixed this in V13.

saisanthoshm88 · April 21, 2011, 18:30

Glenn I think the coupling concept is applicable only in a Fluid structure interaction (FSI) but is it indeed needed at any flluid - solid (or) solid - solid interface. May be a newbie question but please clarify upon this.

ghorrocks · April 26, 2011, 23:12

The coupling I am refering to here is the coupling of the heat equation in the fluid domain with the heat equation in the solid domain. These two temperature fields are coupled through the interface. Hence my answer is talking about the tightness of the coupling.

saisanthoshm88 · April 28, 2011, 10:11

Oh k I was just getting confused with the FSI thing when you mentioned of coupling.

ghorrocks · April 28, 2011, 19:46

Coupling is just a generic term for joining one set of equations to another set. The is coupling between the pressure and momentum equations, there is coupling between a heat transfer solid and an adjacent fluid domain, and there is coupling between displacements in a FSI run. These are all different examples of how two different equation sets are coupled together.

saisanthoshm88 · April 28, 2011, 22:09

Thanks Glenn. This clears up my ambiguity.

April 14, 2011, 15:22	CFX Mesh interfaces	#1
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 18	Can some one please explain why a GGI interface is preferred for Fluid-solid and solid-solid connections in CFX rather than the one-to-one interface __________________ Best regards, Santhosh. Last edited by saisanthoshm88; April 15, 2011 at 04:28.

April 21, 2011, 18:30		#3
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 18	Glenn I think the coupling concept is applicable only in a Fluid structure interaction (FSI) but is it indeed needed at any flluid - solid (or) solid - solid interface. May be a newbie question but please clarify upon this. __________________ Best regards, Santhosh.

April 28, 2011, 10:11		#5
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 18	Oh k I was just getting confused with the FSI thing when you mentioned of coupling. __________________ Best regards, Santhosh.

April 28, 2011, 22:09		#7
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 18	Thanks Glenn. This clears up my ambiguity. __________________ Best regards, Santhosh.

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April 15, 2011, 08:04		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,850 Rep Power: 144	Because a GGI uses full 2-way coupling between the domains but a 1to1 only uses 1-way coupling. A GGI will probably converge faster. Not sure but they may have fixed this in V13.

April 26, 2011, 23:12		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,850 Rep Power: 144	The coupling I am refering to here is the coupling of the heat equation in the fluid domain with the heat equation in the solid domain. These two temperature fields are coupled through the interface. Hence my answer is talking about the tightness of the coupling.

April 28, 2011, 19:46		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,850 Rep Power: 144	Coupling is just a generic term for joining one set of equations to another set. The is coupling between the pressure and momentum equations, there is coupling between a heat transfer solid and an adjacent fluid domain, and there is coupling between displacements in a FSI run. These are all different examples of how two different equation sets are coupled together.