# rotating problem using NS equation

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 March 25, 2013, 16:59 rotating problem using NS equation #1 Member   Sean (J.X.) Shi Join Date: May 2012 Location: US Posts: 34 Rep Power: 6 Hi, I am learning to solve rotating problem in SU2. I ran two examples for rot_NACA0012 and rot_openrotor. They ran well. When I change Euler to NS equation, the residual, lift and drag all return NAN. So, I am wondering if SU2 can solve NS rotating problem. And can I solve unsteady rotating problem? If not, What need I do in .cfg file? Should I setup two fluid zones? one is rotating frame the other one is reference frame. How to do that? Thanks.

 March 25, 2013, 17:22 #2 Senior Member   Join Date: Nov 2010 Posts: 133 Rep Power: 7 Hello, By going through the Tutorial8 - Optimal Shape Design of a Rotating Airfoil. I found the following text unde the heading Configuration File Options which says: In SU2, the Euler equations have been transformed into a rotating reference frame which offers an efficient, steady solution method for flows around rotating bodies in axisymmetric flow. A simulation can be executed in a rotating frame by setting the ROTATING_FRAME flag to "YES." May be this text is only related to that tutorial or thats true in general.

March 25, 2013, 17:50
#3
Member

Sean (J.X.) Shi
Join Date: May 2012
Location: US
Posts: 34
Rep Power: 6
Thanks for your information.

I read the Paper by SU2's authors.
Optimal Shape Design for Open Rotor Blades
In the paper, Euler equations were mentioned like that.
They also cited a paper named
Adjoint-Based Design of Rotors in a Noninertial Reference Frame
which discussed NS equations in a rotating frame.
That is why I want to try NS rotating problem in SU2.

Quote:
 Originally Posted by taxalian Hello, By going through the Tutorial8 - Optimal Shape Design of a Rotating Airfoil. I found the following text unde the heading Configuration File Options which says: In SU2, the Euler equations have been transformed into a rotating reference frame which offers an efficient, steady solution method for flows around rotating bodies in axisymmetric flow. A simulation can be executed in a rotating frame by setting the ROTATING_FRAME flag to "YES." May be this text is only related to that tutorial or thats true in general.

 March 26, 2013, 16:08 #4 Super Moderator   Thomas D. Economon Join Date: Jan 2013 Location: Stanford, CA Posts: 270 Rep Power: 6 Hi, At the moment, only the Euler equations in a rotating frame have been implemented and validated in SU2. We are currently in the process of making the extra changes for the Navier-Stokes and RANS equations in a rotating frame. This mainly just requires an adjustment to the no-slip boundary condition and the non-dimensionalization (and the turbulence model for RANS). Look for future updates with this capability. Also, the more recent versions of the code have an unsteady solver with the capability to handle dynamic meshes (rigid), including pitching, plunging, and rotation. Please see the config_template.cfg file under the UNSTEADY SIMULATION section for these options. Hope this helps! Tom

 March 27, 2013, 12:36 #5 Member   Sean (J.X.) Shi Join Date: May 2012 Location: US Posts: 34 Rep Power: 6 Thanks, it is clear clarification.

January 27, 2016, 12:30
Su2 rotating_frame
#6
New Member

Mehmet SAHIN
Join Date: Dec 2011
Posts: 5
Rep Power: 6
Is ROTATING_FRAME currently available for the Navier-Stokes equations in the latest version?

Mehmet

Quote:
 Originally Posted by economon Hi, At the moment, only the Euler equations in a rotating frame have been implemented and validated in SU2. We are currently in the process of making the extra changes for the Navier-Stokes and RANS equations in a rotating frame. This mainly just requires an adjustment to the no-slip boundary condition and the non-dimensionalization (and the turbulence model for RANS). Look for future updates with this capability. Also, the more recent versions of the code have an unsteady solver with the capability to handle dynamic meshes (rigid), including pitching, plunging, and rotation. Please see the config_template.cfg file under the UNSTEADY SIMULATION section for these options. Hope this helps! Tom

March 15, 2016, 10:52
#7
New Member

Tansu
Join Date: Apr 2014
Location: Turkey
Posts: 13
Rep Power: 4
Quote:
 Originally Posted by msahin.ae00 Is ROTATING_FRAME currently available for the Navier-Stokes equations in the latest version? Mehmet
Probably yes. Because in one of their paper (2014) they solved Caradonna-Tung blade with NS equations.

Tansu

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