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rotating problem using NS equation

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Old   March 25, 2013, 16:59
Default rotating problem using NS equation
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Sean (J.X.) Shi
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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.
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Old   March 25, 2013, 17:22
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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.
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Old   March 25, 2013, 17:50
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Sean (J.X.) Shi
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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 View Post
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.
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Old   March 26, 2013, 16:08
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Thomas D. Economon
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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
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Old   March 27, 2013, 12:36
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Sean (J.X.) Shi
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Thanks, it is clear clarification.
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