Naturally oscillating 2D-cylinder

[Haider-BA]

Kindly include an example of naturally oscillating (elastically mounted / VIV) 2D cylinder.

[Haider-BA]

Did you try to implement the above problem. For reference, please see the code lines from 153 - 168 in the attached link.
https://github.com/unicfdlab/TrainingTracks/blob/master/OpenFOAM/simpleFsi-OF3.0.0/src/basicFsiFunctionObject/basicFsi.C

[nickabattista]

Sorry I have not had a chance to try to implement it, yet. I have been adding more functionality to the code. I will try to get to that. Do you need it ASAP?

[Haider-BA]

Yes, I need it ASAP. If you could implement it.

[nickabattista]

I am implementing it now. I'll keep you up-to-date.

[Haider-BA]

Thank you. I am waiting anxiously.

[nickabattista]

I have an implementation ready with elastic (non-damped) springs attaching the cylinder to the channel. I am adding in functionality for damped springs now, but it may take me a day or two.

[nickabattista]

I have an example of the VIV cylinder with damped springs now working. Please let me know what you think. Thanks:

-> IB2d/matIB2d/Examples/Example_VIV_Cylinder/Single_VIV_Cylinder_Damped_Springs_256

[nickabattista]

Thoughts?

[Haider-BA]

I tried but cold not understand whether the circular cylinder is moving due to aerodynamic forces or still? Reporting the position (x and y) w.r.t time will be helpful to get the idea. It looks different implementation than the literature.

[nickabattista]

You can visualize the data that the simulation produces in either VisIt (https://wci.llnl.gov/simulation/computer-codes/visit/ ) or ParaView (http://www.paraview.org/download/ ), and look at any of the Eulerian data (velocity vectors, velocity magnitudes, vorticity, pressure, etc., along with the position of the Lagrangian Structure. You can do the explicit analysis you described using the data_analysis software within IB2d. There is an example for flow in a channel here: IB2d/data_analysis/analysis_in_matlab/Example_For_Data_Analysis/

The circular cylinder is moving solely based on the fluid dynamic forces acting on it alone, and then it is recoiling back due to the elastic deformations of the damped springs tethering the cylinder to the walls of the channel.

[Haider-BA]

Now I can see the movement. But the boundary looks deformed (elastic), I think it should be rigid.
For data analysis same file (IB2d/data_analysis/analysis_in_matlab/Example_For_Data_Analysis/) will be used or it needs modification?

[Haider-BA]

How to test VIV with different Mass ratios, frequency, etc.., where to input?