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how to add spring/damping effect to connect two moving body

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Old   March 27, 2013, 10:47
Default how to add spring/damping effect to connect two moving body
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Teemo
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Dear FoAMers,



I would like to connect these two moving parts together by a spring , how can I achieve it in OPENFOAM?

Your suggestion will be appreciated.

Regards,
T
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Old   March 27, 2013, 10:50
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Last edited by Teemo; March 27, 2013 at 11:13.
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Old   March 27, 2013, 12:17
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Niels Gjoel Jacobsen
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Hi Teemo,

I my version of OF (1.6-ext) you can find the following constraints for mesh motion here:

Code:
/src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotionRestraint
The linear spring seems like a good choice for the initial investigation.

I have no idea on how they are working, though I know that the are also present in the more recent releases of OF.

Good luck,

Niels
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Old   March 27, 2013, 12:41
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Thanks Niels,

I will give it a try.

Regards,
T
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Old   March 27, 2013, 13:23
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hello again,

I have looked into the linear spring file and for its setup:
//- Anchor point, where the spring is attached to an immovable object
point anchor_;

//- Reference point of attachment to the solid body
point refAttachmentPt_;

//- Spring stiffness coefficient (N/m)
scalar stiffness_;

//- Damping coefficient (Ns/m)
scalar damping_;

//- Rest length - length of spring when no forces are applied to it
scalar restLength_;
it seems that one end of the spring should be fixed, but for my case, i need both ends move with the floaters, any idea?

Regards,
T
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Old   November 10, 2014, 11:09
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Teng
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Hi Teemo,

I am currently facing similar situation and would like to know whether you had any luck on it?

Regards
tyoung
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