Translational Periodic BC Errors

Dyls · August 12, 2015, 18:36

Hi

I am attempting to model flow in a heat exchanger and am starting by not yet looking at the heat equation (only momentum).

Inlet and outlet BCs are normal to the flow while a translational periodic BC is running parallel on the top and bottom (for the sake of simplicity, pretend that this is a 2D problem). There is an obstruction that forces some of the flow to exit the top and I would expect that flow to re-emerge at the bottom (as specified by the periodic BC).

When I attempt to run this situation, I get 2 error messages as follows:

"The ANSYS CFX partitioner exited with the return code 1."

"Update failed for the solution component in CFX. The solver failed with a non-zero exit code of : 2"

Any help is appreciated. Thank you.

Dylan

ghorrocks · August 12, 2015, 19:33

Please show an image of what you are modelling.

Does your simulation run if you do a serial (single processor) simulation?

Dyls · August 12, 2015, 22:17

Here are some images. This is supposed to be a heat exchanger. The fin is the wavy section in the middle of the fluid.

I have tried to model using translational periodic boundary conditions on a very simple flow problem but I run into the same error, so I don't think that it is related to the complexity of the geometry.

Thanks
Dylan

coils.jpg

close up coils.jpg

close up coils 2.jpg

ghorrocks · August 12, 2015, 23:04

The first error is the important one - the second error is just a flow on from the first.

For some reason the partitioner is not partitioning your mesh. Here are some ideas for you to try:
* Do you have enough memory?
* Is the mesh well formed?
* Try a different partitioning algorithm (eg recursive bisection)
* Does it run serial (ie no parallel of any form)?
* Can you run a tutorial example multi-processor?
* Does it partition of a different PC?

August 12, 2015, 18:36	Translational Periodic BC Errors	#1
Dyls New Member Dylan Join Date: Mar 2012 Posts: 25 Rep Power: 14	Hi I am attempting to model flow in a heat exchanger and am starting by not yet looking at the heat equation (only momentum). Inlet and outlet BCs are normal to the flow while a translational periodic BC is running parallel on the top and bottom (for the sake of simplicity, pretend that this is a 2D problem). There is an obstruction that forces some of the flow to exit the top and I would expect that flow to re-emerge at the bottom (as specified by the periodic BC). When I attempt to run this situation, I get 2 error messages as follows: "The ANSYS CFX partitioner exited with the return code 1." "Update failed for the solution component in CFX. The solver failed with a non-zero exit code of : 2" Any help is appreciated. Thank you. Dylan

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August 12, 2015, 19:33		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Please show an image of what you are modelling. Does your simulation run if you do a serial (single processor) simulation?

August 12, 2015, 22:17		#3
Dyls New Member Dylan Join Date: Mar 2012 Posts: 25 Rep Power: 14	Here are some images. This is supposed to be a heat exchanger. The fin is the wavy section in the middle of the fluid. I have tried to model using translational periodic boundary conditions on a very simple flow problem but I run into the same error, so I don't think that it is related to the complexity of the geometry. Thanks Dylan coils.jpg close up coils.jpg close up coils 2.jpg

August 12, 2015, 23:04		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The first error is the important one - the second error is just a flow on from the first. For some reason the partitioner is not partitioning your mesh. Here are some ideas for you to try: * Do you have enough memory? * Is the mesh well formed? * Try a different partitioning algorithm (eg recursive bisection) * Does it run serial (ie no parallel of any form)? * Can you run a tutorial example multi-processor? * Does it partition of a different PC?