Multi-passage Simulation in CFX

Da_1996 · February 16, 2020, 09:43

Hey guys,
I'd like to do a 8-passage, unsteady simulation of axial compressor at near stall condition. In order to do so, I simulated a single passage model at near stall condition, and used the single passage result as the initial flow filed of the multi-passage model. However, the simulation seems to crash. I checked the boundary condition for many times, so the boundary setup is correct. Therefore, I suppose whether there will be a mistake during the single passage result transforming to the multi-passage initial flow field.

Best regards,

Da

AtoHM · February 17, 2020, 02:03

Write a backup / transient output at the initial time step. That should allow you to check how the single passage result was applied to your multi-passage setup.

Opaque · February 17, 2020, 09:50

How did you initialize from single passage to multi-passage setup?

Da_1996 · February 17, 2020, 23:22

Quote:

Originally Posted by AtoHM

Write a backup / transient output at the initial time step. That should allow you to check how the single passage result was applied to your multi-passage setup.

Thank you very much. I checked the output at initial time step, the result is definitely wrong. So do you have any ideas on initial the simulation from single passage to multi-passage?

Da_1996 · February 17, 2020, 23:25

Quote:

Originally Posted by Opaque

How did you initialize from single passage to multi-passage setup?

I just input the single simulation results as the initial file in Solver-manager. I checked the initial time step output, and find that this method seems improper. Can you give me some suggestion on that?

AtoHM · February 18, 2020, 02:08

Yes. There is a tool to make a rotational copy of the results to the other passages. I forgot the naming of it ... but there was a thread here some time ago ...

Interpolating Segment-Result on Full-Cylinder-Model as initial Condition

Da_1996 · February 19, 2020, 23:50

Quote:

Originally Posted by AtoHM

Yes. There is a tool to make a rotational copy of the results to the other passages. I forgot the naming of it ... but there was a thread here some time ago ...

Interpolating Segment-Result on Full-Cylinder-Model as initial Condition

Thank you sooooo much. The problem has been solved!!!

February 16, 2020, 09:43	Multi-passage Simulation in CFX	#1
Da_1996 New Member Join Date: Nov 2019 Posts: 4 Rep Power: 7	Hey guys, I'd like to do a 8-passage, unsteady simulation of axial compressor at near stall condition. In order to do so, I simulated a single passage model at near stall condition, and used the single passage result as the initial flow filed of the multi-passage model. However, the simulation seems to crash. I checked the boundary condition for many times, so the boundary setup is correct. Therefore, I suppose whether there will be a mistake during the single passage result transforming to the multi-passage initial flow field. Best regards, Da

February 17, 2020, 09:50		#3
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	How did you initialize from single passage to multi-passage setup? __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

February 18, 2020, 02:08		#6
AtoHM Senior Member M Join Date: Dec 2017 Posts: 703 Rep Power: 13	Yes. There is a tool to make a rotational copy of the results to the other passages. I forgot the naming of it ... but there was a thread here some time ago ... Interpolating Segment-Result on Full-Cylinder-Model as initial Condition evcelica likes this.

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February 17, 2020, 02:03		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 703 Rep Power: 13	Write a backup / transient output at the initial time step. That should allow you to check how the single passage result was applied to your multi-passage setup.