the pressure field is not continous at interior bc

harry1329 · December 1, 2014, 09:43

Hi,

I am trying to analysis the flow around the NACA0018 and I used C-type grid made by Gridgen.

But the solution is not continous at the line in domain like attached picture.

Especially, the pressure filed is discontinous and other variables(such as velocity, viscosity)are continous at that line.

I am using Fluent(Ansys 13) and I gave interior bc to this line.

Could you tell me what the problem is?

I'm sorry about my poor English.

Thanks.

harry1329 · December 1, 2014, 09:47

This is my u & v field.

FMDenaro · December 1, 2014, 12:11

I do not understand your question ... what do you mean for "the solution is not continous at the line in domain"?

harry1329 · December 1, 2014, 13:03

Sorry, I mean the line at y = 0

When you see the pressure field, the solution looks like to be cut by this line and the contour is discontinous

FMDenaro · December 1, 2014, 13:38

when you imported the C-grid, did you check if the bc.s type were already prescribed? It seems you have some fixed conditions...
Generally, the best procedure is to set bc.s directly in Fluent, not in the grid

harry1329 · December 1, 2014, 15:44

The interior bc of fluent was given automatically and I could change it to fan, porous jump, radiator or wall, but there was no periodic boundary condition.

FMDenaro · December 1, 2014, 16:01

You cannot prescribe any bc along y=0, the solution has to be computed from the equations...

December 1, 2014, 09:43	the pressure field is not continous at interior bc	#1
harry1329 New Member Won Hyuck Yoon Join Date: Dec 2014 Posts: 4 Rep Power: 11	Hi, I am trying to analysis the flow around the NACA0018 and I used C-type grid made by Gridgen. But the solution is not continous at the line in domain like attached picture. Especially, the pressure filed is discontinous and other variables(such as velocity, viscosity)are continous at that line. I am using Fluent(Ansys 13) and I gave interior bc to this line. Could you tell me what the problem is? I'm sorry about my poor English. Thanks.

December 1, 2014, 13:03	Re: FMDenaro	#4
harry1329 New Member Won Hyuck Yoon Join Date: Dec 2014 Posts: 4 Rep Power: 11	Sorry, I mean the line at y = 0 When you see the pressure field, the solution looks like to be cut by this line and the contour is discontinous

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December 1, 2014, 09:47		#2
harry1329 New Member Won Hyuck Yoon Join Date: Dec 2014 Posts: 4 Rep Power: 11	This is my u & v field.

December 1, 2014, 12:11		#3
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,769 Rep Power: 71	I do not understand your question ... what do you mean for "the solution is not continous at the line in domain"?

December 1, 2014, 13:38		#5
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,769 Rep Power: 71	when you imported the C-grid, did you check if the bc.s type were already prescribed? It seems you have some fixed conditions... Generally, the best procedure is to set bc.s directly in Fluent, not in the grid

December 1, 2014, 15:44		#6
harry1329 New Member Won Hyuck Yoon Join Date: Dec 2014 Posts: 4 Rep Power: 11	The interior bc of fluent was given automatically and I could change it to fan, porous jump, radiator or wall, but there was no periodic boundary condition.

December 1, 2014, 16:01		#7
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,769 Rep Power: 71	You cannot prescribe any bc along y=0, the solution has to be computed from the equations...