# how to make a SU2 aeroelastic 2D airfoil computation

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October 9, 2020, 05:01
how to make a SU2 aeroelastic 2D airfoil computation
#1
New Member

Kevin Wittkowski
Join Date: Sep 2020
Posts: 14
Rep Power: 5
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
Attached Images
 aeroelast1.PNG (11.9 KB, 3 views)

 October 9, 2020, 07:17 #2 Senior Member   Pedro Gomes Join Date: Dec 2017 Posts: 459 Rep Power: 12 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

 October 9, 2020, 07:30 #3 New Member   Kevin Wittkowski Join Date: Sep 2020 Posts: 14 Rep Power: 5 Hello Pedro, thank you for your fast reply. It was very helpful.

October 14, 2020, 12:33
damping
#4
New Member

Kevin Wittkowski
Join Date: Sep 2020
Posts: 14
Rep Power: 5
Hello, how can I change the linear and rotational damping in this simulation?

Quote:
 Originally Posted by pcg 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

 October 14, 2020, 17:02 #5 Senior Member   Pedro Gomes Join Date: Dec 2017 Posts: 459 Rep Power: 12 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.

 October 15, 2020, 05:01 #6 New Member   Kevin Wittkowski Join Date: Sep 2020 Posts: 14 Rep Power: 5 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.

 Tags aeroelasticity, airfoil 2d, flutter, mesh deformation, su2

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