Finned Pipe Trouble

fabioxyz · August 26, 2009, 10:07

Hi, I need to solve a trouble with cfx used to simulate an example of "fin pipe" as in figure below, where the lower face of pipe trasmit a heat power and where ther is a flow of water.
The blue zone is a water domain. If each single fin separates blue zone into multi-parts domain, as we see in figure,

the solver fails imediatly and providing this error message:

An error has occurred in cfx5solve: |
| |
| Error interpolating results onto the new mesh: C:\Program |
| Files\Ansys Inc\v120\CFX\bin\winnt-amd64\solver-hpmpi.exe exited |
| with return code 1.

Otherwise if the fins are more little then pipe's height (as second figure) , domain is considered as a single part, and
the solver correctly runs.

Could you explain me the reason of that mistake?

ps for both geometry i have defined in cfx-pre the same elements:

1 fluid domain (1°geometry: nine parts not contiguous; 2°geometry one part)
1 solid domain
One Boundary condition for water in flow
One Boundary condition for water out flow
Boundary condition for heat transfer from lower face of pipe
interface from solid and liquid domains

Thanks

ghorrocks · August 26, 2009, 18:29

For the case with separate fluid domains, put a separate inlet and outlet boundary condition on each face. I am not sure that's the problem but its worth a try.

fabioxyz · August 27, 2009, 04:55

yes, with that solution, i'm sure working fine, but i think that are another way (more quick) to set cfx-pre...don't u think so?

ghorrocks · August 27, 2009, 07:18

On the geometry you show it will only take a few minutes to set it up as I describe. How much quicker do you want? Are you going to spend days trying to speed the setup up by 5 minutes?

fabioxyz · August 27, 2009, 07:24

yes yes, u are right, it'was only my curiosity

csmistry · August 28, 2009, 03:44

Dear sir,

I am facing same problem for analysis of fluid flow with insert like for modeling i prepared one cylinder then i inserted a thin plate as you deed and then i cut that geometry.. it generates to parts for inlet i select to portions same way for outlet 2 portions and outer wall... means by putting this plate i am splitting the flow in two domains.... i am getting the same error as you are... return code 1.

please guide me what to do...

fabioxyz · August 28, 2009, 03:58

as ghorrocks said me, try to create 2 equal boundary condition for Inlet and the same for out boundary condition. wait your news

ghorrocks · August 28, 2009, 06:41

Or to put it more clearly a boundary condition should not span multiple domains. Boundary conditions which span multiple parts of the same domain which are not connected (eg two fluid regions in one fluid domain with a solid region in between) should also have separate boundary conditions on each region.

csmistry · August 31, 2009, 02:20

Yes, thank you sir. i spend hours to have solution and i got it..
thanks a lot

August 26, 2009, 10:07	Finned Pipe Trouble	#1
fabioxyz New Member Fabio Join Date: Aug 2009 Posts: 6 Rep Power: 16	Hi, I need to solve a trouble with cfx used to simulate an example of "fin pipe" as in figure below, where the lower face of pipe trasmit a heat power and where ther is a flow of water. The blue zone is a water domain. If each single fin separates blue zone into multi-parts domain, as we see in figure, the solver fails imediatly and providing this error message: An error has occurred in cfx5solve: \| \| \| \| Error interpolating results onto the new mesh: C:\Program \| \| Files\Ansys Inc\v120\CFX\bin\winnt-amd64\solver-hpmpi.exe exited \| \| with return code 1. Otherwise if the fins are more little then pipe's height (as second figure) , domain is considered as a single part, and the solver correctly runs. Could you explain me the reason of that mistake? ps for both geometry i have defined in cfx-pre the same elements: 1 fluid domain (1°geometry: nine parts not contiguous; 2°geometry one part) 1 solid domain One Boundary condition for water in flow One Boundary condition for water out flow Boundary condition for heat transfer from lower face of pipe interface from solid and liquid domains Thanks

August 28, 2009, 03:44	Simmilar problem	#6
csmistry Member mistry Join Date: Apr 2009 Location: India Posts: 69 Rep Power: 17	Dear sir, I am facing same problem for analysis of fluid flow with insert like for modeling i prepared one cylinder then i inserted a thin plate as you deed and then i cut that geometry.. it generates to parts for inlet i select to portions same way for outlet 2 portions and outer wall... means by putting this plate i am splitting the flow in two domains.... i am getting the same error as you are... return code 1. please guide me what to do...

August 31, 2009, 02:20	solution	#9
csmistry Member mistry Join Date: Apr 2009 Location: India Posts: 69 Rep Power: 17	Yes, thank you sir. i spend hours to have solution and i got it.. thanks a lot

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August 26, 2009, 18:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	For the case with separate fluid domains, put a separate inlet and outlet boundary condition on each face. I am not sure that's the problem but its worth a try.

August 27, 2009, 04:55		#3
fabioxyz New Member Fabio Join Date: Aug 2009 Posts: 6 Rep Power: 16	yes, with that solution, i'm sure working fine, but i think that are another way (more quick) to set cfx-pre...don't u think so?

August 27, 2009, 07:18		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	On the geometry you show it will only take a few minutes to set it up as I describe. How much quicker do you want? Are you going to spend days trying to speed the setup up by 5 minutes?

August 27, 2009, 07:24		#5
fabioxyz New Member Fabio Join Date: Aug 2009 Posts: 6 Rep Power: 16	yes yes, u are right, it'was only my curiosity

August 28, 2009, 03:58		#7
fabioxyz New Member Fabio Join Date: Aug 2009 Posts: 6 Rep Power: 16	as ghorrocks said me, try to create 2 equal boundary condition for Inlet and the same for out boundary condition. wait your news

August 28, 2009, 06:41		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Or to put it more clearly a boundary condition should not span multiple domains. Boundary conditions which span multiple parts of the same domain which are not connected (eg two fluid regions in one fluid domain with a solid region in between) should also have separate boundary conditions on each region.