GGI Interface Partially Against a Wall

lordvon · October 2, 2010, 09:34

Suppose we take the mixerGgi tutorial case (closed; outer wall and rotating mesh boundary are concentric) and introduce a few openings in the outer wall for inlets and outlets, and also enlarge the fan blades so that there is a small gap between the tip of the blades and the outer wall.

Is it possible to extend the rotating mesh boundary all the way to the outer wall (then the only stator mesh remaining would be that of the inlets and outlets), and would any advantage be gained in this setup?

Ohbuchi · October 3, 2010, 19:45

Hi,

If you extend the rotating mesh boundary(GGI interface?) all the way to the outer wall,
whole domain other than its inlet and/or outlet opening boundary would be rotating.
So it would be suitable MRF simulation, but if you treat outer wall as counter-rotating wall, inlet and/or boundary on the outer wall should be rotating.
Can we handle these rotating region by use of partial overlap Ggi?

hjasak · October 6, 2010, 08:21

You should use the sliding interface for this: it will geometrically split the patch and allow you to specify the boundary condition on the exposed part in the usual way.

Hrc

October 2, 2010, 09:34	GGI Interface Partially Against a Wall	#1
lordvon Senior Member Robert Join Date: Sep 2010 Posts: 158 Rep Power: 15	Suppose we take the mixerGgi tutorial case (closed; outer wall and rotating mesh boundary are concentric) and introduce a few openings in the outer wall for inlets and outlets, and also enlarge the fan blades so that there is a small gap between the tip of the blades and the outer wall. Is it possible to extend the rotating mesh boundary all the way to the outer wall (then the only stator mesh remaining would be that of the inlets and outlets), and would any advantage be gained in this setup?

October 6, 2010, 08:21		#3
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,905 Rep Power: 33	You should use the sliding interface for this: it will geometrically split the patch and allow you to specify the boundary condition on the exposed part in the usual way. Hrc __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
source code for GGI interface	rcm	OpenFOAM	1	May 5, 2010 10:49
Defining Interface as wall	Hectux	OpenFOAM Running, Solving & CFD	6	June 8, 2009 04:45
No results for solid domain	Gary Holland	CFX	10	March 13, 2009 03:30
Multicomponent fluid	Andrea	CFX	2	October 11, 2004 05:12
Wall function in adverse pressure gradients	stephane baralon	Main CFD Forum	11	September 2, 1999 04:05

October 3, 2010, 19:45		#2
Ohbuchi Member Masashi Ohbuchi Join Date: Oct 2009 Posts: 74 Rep Power: 16	Hi, If you extend the rotating mesh boundary(GGI interface?) all the way to the outer wall, whole domain other than its inlet and/or outlet opening boundary would be rotating. So it would be suitable MRF simulation, but if you treat outer wall as counter-rotating wall, inlet and/or boundary on the outer wall should be rotating. Can we handle these rotating region by use of partial overlap Ggi?