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How can make cylinder moves naturally in openfoam?

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Old   May 19, 2014, 05:26
Default How can make cylinder moves naturally in openfoam?
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Dear OpenFOAM users,

I hope you are all doing well.

I need your help please to make my static circular cylinder moves naturally using OpenFOAM (case attached). I have been stuck on that for long time, but I'm still looking forward to get the solution. Any answer would be welcomed.

Many thanks in advanced for your help.

Maimouna
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Old   May 20, 2014, 14:30
Default Naturally?
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Could you specify what you mean by naturally? I have been working a lot on rotating geometries with OpenFOAM, so I could help you, but i do not understand what you mean by "Naturally" here.

Cheers,
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Old   May 20, 2014, 17:18
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Dear Bruno Blais,

many thanks for your reply. I meant by natural vibration don't need to specify a motion for the cylinder. Let the cylinder (within certain constraints) move accordingly to how the forces caused by the fluid act on it. I hope get solution to my question please. If you have more question do not hesita to ask please.

Many thanks in advanced.

Maimouna
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Old   May 21, 2014, 11:26
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Hey,

if I get you correct, you mean the natural moving of the cylinder due to forces/pressure that the fluid interact with the cyclinder?

If itīs so I am also very interested in the correct settings of Boundary-Conditions.
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Old   May 21, 2014, 11:32
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Quote:
Originally Posted by Maimouna View Post
Dear Bruno Blais,

many thanks for your reply. I meant by natural vibration don't need to specify a motion for the cylinder. Let the cylinder (within certain constraints) move accordingly to how the forces caused by the fluid act on it. I hope get solution to my question please. If you have more question do not hesita to ask please.

Many thanks in advanced.

Maimouna
I do not know offhand a BC model in OpenFOAM to do this sort of calculation.

However, this is definitely doable. You would need to define some sort of spring or mechanical model for the cylinder and calculate the force on the boundary to obtain the cylinder acceleration and displacement. If your mesh deformation are small, then you could deform the mesh locally around the cylinder while applying a Dirichlet boundary condition for the velocity on the cylinder.

However, this is not a trivial task. Similar work might have already been carried out in the context of fluid-structure interaction, so you might want to take a look at OpenFOAM-dev for a possible implementation.

Cheers,
Bruno
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Old   May 21, 2014, 12:29
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Quote:
Hey,

if I get you correct, you mean the natural moving of the cylinder due to forces/pressure that the fluid interact with the cyclinder?

If itīs so I am also very interested in the correct settings of Boundary-Conditions.
Dear Tobias,

yes, exactly that what I'm looking. Do you have any idea?

Regards
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