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Marine Propeller rotating mesh

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Old   November 16, 2020, 03:03
Exclamation Marine Propeller rotating mesh
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Rakeshchandra
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Hey everyone,

I am trying to make a simulation of Marine Propeller in CFX, and I have a problem
with generating rotating mesh. After creating domains, I used Frame change as "None" with pitch change also as "None" in the domain interface section then I faced with the following error:

Message: Error number 1 found in subroutine CHECK_INIT. Interface "Default Fluid Fluid Interface" connects a rotating and stationary domain, but has no frame change model.

After going thru a few threads, I found that I can use a Frozen Rotor or Transient rotor/stator. So I used the Frozen Rotor, it has generated the results. But I felt that the results, which are generated aren't corrected because there's a sudden decrease in the velocity after the rotating domain region.

I would be glad if someone suggests and clarifies this.
Thank you in Advance
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Old   November 16, 2020, 03:21
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The frozen rotor approach should be ok.

Try to plot 'velocity in stationary frame'

As you can observe default 'velocity' in the rotating domain now adds an (omega*R) to the velocity.
This is why the velocity gets larger with respect to R from the rotating axis.
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Old   November 16, 2020, 03:32
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Thanks for replying, I'll tried your suggestion and I didn't find any change. Let me know if I'm committed any mistake.
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Old   November 16, 2020, 04:13
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In this figure, the velocity is only plotted in the stationary domain.
So I can not see what had changed. Also, add the color table in the figures so we can see what is ploted

Plot 'velocity in stationary frame' in both domains stationary and frozen rotor domain, not just in one.

It is also best to have the mesh size on the interface, the same size on both sides, or even better, that the nodes match on both sides (when using frozen rotor).
(this in not necessary but an improvement)

Last edited by urosgrivc; November 16, 2020 at 07:11.
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Old   November 16, 2020, 11:29
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Note that the mesh which I've created a is coarse one as this was a trial case and please have a glance at these images. I hope these images are helpful.
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File Type: jpg CFX 3.jpg (68.8 KB, 15 views)
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Old   November 16, 2020, 16:37
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urosgrivc is correct, you need to plot "Velocity in Stn Frame" in all domains to see a continuous velocity field (as referenced in the stationary frame )

This question has been asked a lot so we wrote an FAQ on it: https://www.cfd-online.com/Wiki/Ansy...f_reference.3F
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Old   November 17, 2020, 04:31
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Thank you for replying and for the link I will look into it.
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Old   November 17, 2020, 07:06
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Thank you for replying Urosgrivc and ghorrocks for replying I got the appropriate results. Thanks a lot
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ansys 14 cfx, cfx & air content, marine propeller, meshing ; solver settings

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