[Sunny Chitti]

I am not completely new to ANSYS, I had some practice with Fluent and CFX. But I never ran simulations of Fluid and Body interactions. I want to steady the characteristics of induced vibrations or motion in Ropes or Sheets by an external agent in a Fluid medium. The images below shows the type of motion I am intending to explain

http://epiphanyvideoworks.com/Scienc...ope%20wave.jpg https://d2gne97vdumgn3.cloudfront.ne...p5SmGDyZ1wPnyA

I know that to perform two way Fluid Interaction which I need, it is little complicated. Is there any possible way that I can induce such motion in ropes or sheets using ANSYS and run CFD simulation? Please let me know.

[ghorrocks]

The examples you give are not Fluid structure interaction. They are just simple harmonic motion of the solid body, the fluid does not interact with the solid significantly.

But if these vibrations are caused by interaction with the fluid - then there is nothing fundamentally different to this model to the other FSI models in the example tutorials. This case will be a bit tricky as the stiffness of the solid is low which can make coupling tricky, and the amount of motion is large so handling the large mesh deflections will require some thought. But the fundamental process is the same as the simple tutorial examples.

[Sunny Chitti]

Originally Posted by ghorrocks

The examples you give are not Fluid structure interaction. They are just simple harmonic motion of the solid body, the fluid does not interact with the solid significantly.

But if these vibrations are caused by interaction with the fluid - then there is nothing fundamentally different to this model to the other FSI models in the example tutorials. This case will be a bit tricky as the stiffness of the solid is low which can make coupling tricky, and the amount of motion is large so handling the large mesh deflections will require some thought. But the fundamental process is the same as the simple tutorial examples.

Hello ghorrocks,

Thank you for the information you have provided. Yes, as you said they are harmonics but a damping force will be acting on the body if it is placed in viscous medium. I want to find out that damping force and some other factors. As you suggested I worked on Tutorials and as you said when I used flexible material the CFD simulation is not able to estimate properly. Is there any possible solution for this, can you please suggest me.

[ghorrocks]

Read the documentation on how to tune the FSI model to suit very flexible solids. Also start thinking about how you can handle the mesh motion when you have very large deflections like this.