Rotating Reference Frame in CFX

Sbr_CFD · September 28, 2013, 06:54

Hello,

I'm new to CFX software. I've solved many problems in Fluent, but I have a question about the Moving Reference Frame in CFX.
I want to calculate the aerodynamics loads on an airplane with spin. this can be done in Fluent by the Moving Reference Frame option.
How can we do the same task in CFX without defining two fluid zones (inner and outer)? In my opinion, we should define two fluid zones and define a rotation speed for inner zone (in CFX).
Thanks in advance.

ghorrocks · September 30, 2013, 18:32

If you are modelling a spinning aircraft in a far field - so there is no objects in the stationary field - then you can model this with just a single rotating frame of reference. No need for a stationary frame of reference.

Sbr_CFD · October 1, 2013, 05:36

Thank you very much for your reply.

Is the following settings true for the purpose of rotating frame of reference?

- Domain motion: rotating (with angular velocity: 5 rad s^-1)
- Inlet / Outlet frame type: Rotating

I can't obtain a converged solution with the mentioned settings.

Thanks in advance...

ghorrocks · October 1, 2013, 20:46

You might need to set the boundaries as counter-rotating so they are as expected in the stationary frame of reference.

September 28, 2013, 06:54	Rotating Reference Frame in CFX	#1
Sbr_CFD New Member SBR Join Date: May 2013 Posts: 4 Rep Power: 12	Hello, I'm new to CFX software. I've solved many problems in Fluent, but I have a question about the Moving Reference Frame in CFX. I want to calculate the aerodynamics loads on an airplane with spin. this can be done in Fluent by the Moving Reference Frame option. How can we do the same task in CFX without defining two fluid zones (inner and outer)? In my opinion, we should define two fluid zones and define a rotation speed for inner zone (in CFX). Thanks in advance.

September 30, 2013, 18:32		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If you are modelling a spinning aircraft in a far field - so there is no objects in the stationary field - then you can model this with just a single rotating frame of reference. No need for a stationary frame of reference. zkdkeen and Sbr_CFD like this.

October 1, 2013, 20:46		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You might need to set the boundaries as counter-rotating so they are as expected in the stationary frame of reference. zkdkeen likes this.

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October 1, 2013, 05:36		#3
Sbr_CFD New Member SBR Join Date: May 2013 Posts: 4 Rep Power: 12	Thank you very much for your reply. Is the following settings true for the purpose of rotating frame of reference? - Domain motion: rotating (with angular velocity: 5 rad s^-1) - Inlet / Outlet frame type: Rotating I can't obtain a converged solution with the mentioned settings. Thanks in advance...