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-   -   rotating problem using NS equation (https://www.cfd-online.com/Forums/su2/115183-rotating-problem-using-ns-equation.html)

 momo_sjx March 25, 2013 16:59

rotating problem using NS equation

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.

 taxalian March 25, 2013 17:22

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.

 momo_sjx March 25, 2013 17:50

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 (Post 416333) 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.

 economon March 26, 2013 16:08

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

 momo_sjx March 27, 2013 12:36

Thanks, it is clear clarification.

 msahin.ae00 January 27, 2016 12:30

Su2 rotating_frame

Is ROTATING_FRAME currently available for the Navier-Stokes equations in the latest version?

Mehmet

Quote:
 Originally Posted by economon (Post 416590) 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

 tsevine March 15, 2016 10:52

Quote:
 Originally Posted by msahin.ae00 (Post 582658) 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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