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how to make a SU2 aeroelastic 2D airfoil computation

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Old   October 9, 2020, 04:01
Exclamation how to make a SU2 aeroelastic 2D airfoil computation
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Kevin Wittkowski
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Hello,
I'm trying to make a "simple" 2D aeroelastic computation in SU2, taken from
https://su2code.github.io/documents/su2_dev_sanchez.pdf

I have a rigid airfoil vertically bounded in a point (A) by a linear spring and damper and rotationally bounded in that point by a torsional spring and damper (see figure)

I want to simulate the aeroelastic interaction for a given freestream velocity, initial angle of attack and initial rotating speed of the airfoil. I want to set also the elastic and damping coefficients and the position of point A.

I've found no tutorials on cases similar to that on GitHub, so I don't know what are the commands to set this simulation.

Thanks in advance and sorry if my questions may be trivial: I'm a beginner on SU2.

Kind Regards
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Old   October 9, 2020, 06:17
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Pedro Gomes
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There is an example distributed with the code:
configuration in: https://github.com/su2code/SU2/tree/...es/aeroelastic
mesh in: https://github.com/su2code/TestCases...er/aeroelastic
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Old   October 9, 2020, 06:30
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Kevin Wittkowski
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Hello Pedro,
thank you for your fast reply. It was very helpful.
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Old   October 14, 2020, 11:33
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Hello, how can I change the linear and rotational damping in this simulation?

thanks in advance

Quote:
Originally Posted by pcg View Post
There is an example distributed with the code:
configuration in: https://github.com/su2code/SU2/tree/...es/aeroelastic
mesh in: https://github.com/su2code/TestCases...er/aeroelastic
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Old   October 14, 2020, 16:02
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Pedro Gomes
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These are all the options associated with aeroelastic simulations:

Code:
/*!\par CONFIG_CATEGORY: Aeroelastic Simulation (Typical Section Model) \ingroup Config*/
  /*--- Options related to aeroelastic simulations using the Typical Section Model) ---*/
  /* DESCRIPTION: The flutter speed index (modifies the freestream condition) */
  addDoubleOption("FLUTTER_SPEED_INDEX", FlutterSpeedIndex, 0.6);
  /* DESCRIPTION: Natural frequency of the spring in the plunging direction (rad/s). */
  addDoubleOption("PLUNGE_NATURAL_FREQUENCY", PlungeNaturalFrequency, 100);
  /* DESCRIPTION: Natural frequency of the spring in the pitching direction (rad/s). */
  addDoubleOption("PITCH_NATURAL_FREQUENCY", PitchNaturalFrequency, 100);
  /* DESCRIPTION: The airfoil mass ratio. */
  addDoubleOption("AIRFOIL_MASS_RATIO", AirfoilMassRatio, 60);
  /* DESCRIPTION: Distance in semichords by which the center of gravity lies behind the elastic axis. */
  addDoubleOption("CG_LOCATION", CG_Location, 1.8);
  /* DESCRIPTION: The radius of gyration squared (expressed in semichords) of the typical section about the elastic axis. */
  addDoubleOption("RADIUS_GYRATION_SQUARED", RadiusGyrationSquared, 3.48);
  /* DESCRIPTION: Solve the aeroelastic equations every given number of internal iterations. */
  addUnsignedShortOption("AEROELASTIC_ITER", AeroelasticIter, 3);
I also looked at the function that integrates the forces, I don't see any damping coefficient. You could make the fluid more viscous I guess.
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Old   October 15, 2020, 04:01
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Hello Pedro and thank you for your quick reply.
I must have misunderstood a command, sorry.

Is there a way to prescribe rotational and translational damping (as in https://su2code.github.io/documents/su2_dev_sanchez.pdf image that I posted before) without changing the fluid viscosity?

Many thanks in advance.
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aeroelasticity, airfoil 2d, flutter, mesh deformation, su2

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