problem in convergence

thiagu · December 5, 2010, 08:25

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, 17:13

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, 04:43

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, 05:30

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, 08:25	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

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December 5, 2010, 17:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	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, 04:43		#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, 05:30		#4
nelly New Member Nelly Join Date: Oct 2010 Posts: 5 Rep Power: 15	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