problem in convergence

thiagu · December 5, 2010, 09:25

I currently doing the simulation of Single Expansion Ramp Nozzle (SERN),can any one help me how to stimulate both internal and external 3d flow

ghorrocks · December 5, 2010, 18:13

You are never going to get an answer with a question as general as that. All I can do is refer you to the CFX tutorial examples and if that is not enough go to CFX training.

thiagu · December 6, 2010, 05:43

ya i am getting a message like this in every iteration

+--------------------------------------------------------------------+
| ****** Notice ****** |
| A wall has been placed at portion(s) of an INLET |
| boundary condition (at 1.1% of the faces, 0.8% of the area) |
| to prevent fluid from flowing out of the domain. |
| The boundary condition name is: in. |
| The fluid name is: Fluid 1. |
| If this situation persists, consider switching |
| to an Opening type boundary condition instead. |
+--------------------------------------------------------------------+

nelly · December 6, 2010, 06:30

Hi murali,

This means that at the inlet or outlet the flow is re-circulating and this creates a wall.
So if you make the inlet longer or narrower, the message should dissappear.

Thanks
Nelly

December 5, 2010, 09:25	problem in convergence	#1
thiagu New Member thiagarajan murali Join Date: Dec 2010 Posts: 2 Rep Power: 0	I currently doing the simulation of Single Expansion Ramp Nozzle (SERN),can any one help me how to stimulate both internal and external 3d flow

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
convergence problem when use pisoFoam, LES for wind tunnel case	Forrest_Lei	OpenFOAM	3	July 19, 2011 07:00
convergence problem	commonyue	Main CFD Forum	1	December 1, 2009 04:54
Convergence of CFX field in FSI analysis	nasdak	CFX	2	June 29, 2009 02:17
3D Fluid Flow Convergence problem	Emily	FLUENT	2	March 21, 2007 23:18
Non Convergence of 3D Heat transfer cfd problem	Balraj	Main CFD Forum	3	December 9, 2004 01:24

December 5, 2010, 18:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,850 Rep Power: 144	You are never going to get an answer with a question as general as that. All I can do is refer you to the CFX tutorial examples and if that is not enough go to CFX training.

December 6, 2010, 05:43		#3
thiagu New Member thiagarajan murali Join Date: Dec 2010 Posts: 2 Rep Power: 0	ya i am getting a message like this in every iteration +--------------------------------------------------------------------+ \| **** Notice **** \| \| A wall has been placed at portion(s) of an INLET \| \| boundary condition (at 1.1% of the faces, 0.8% of the area) \| \| to prevent fluid from flowing out of the domain. \| \| The boundary condition name is: in. \| \| The fluid name is: Fluid 1. \| \| If this situation persists, consider switching \| \| to an Opening type boundary condition instead. \| +--------------------------------------------------------------------+

December 6, 2010, 06:30		#4
nelly New Member Nelly Join Date: Oct 2010 Posts: 5 Rep Power: 16	Hi murali, This means that at the inlet or outlet the flow is re-circulating and this creates a wall. So if you make the inlet longer or narrower, the message should dissappear. Thanks Nelly