How to give radial displacement to a rigid line in a Axisymmetric analysis?

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Hi Everyone! In my model I want to simulate a rolling operation in a axisymmetric analysis. To represent roller I use a rigid line and then want to give a radial displacement to it ( This methodology used by some people in Ansys). In COMSOL model if I take the line then I am unable to give it rigid domain physics. And If I take rectangle of very small thickness to represent line and give it to rigid domain, then I not find any option to give it a radial displacement.

Please give me suggestions how to do it? If you need some more detail information then inform me. Thanks Shyam


2 Replies Last Post Sep 30, 2022, 6:13 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 2 months ago Sep 30, 2022, 3:59 a.m. EDT

A rigid object cannot be moved radially, since its volume would then increase (it represents a volume of rotation). That is not consistent with being rigid.

You can apply a prescribed displacement in the radial direction, but maybe you need contact conditions?

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Henrik Sönnerlind
COMSOL
A rigid object cannot be moved radially, since its volume would then increase (it represents a volume of rotation). That is not consistent with being rigid. You can apply a prescribed displacement in the radial direction, but maybe you need contact conditions?

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Posted: 2 months ago Sep 30, 2022, 6:13 a.m. EDT

Thanks for your reply.

You can apply a prescribed displacement in the radial direction, but maybe you need contact conditions?

Is this with respect to rigid domain?

Yes I applied contact conditions but unable to give prescribed displacment in radial direction.

I agree with your first sentence.

Thanks very much. Shyam

Thanks for your reply. You can apply a prescribed displacement in the radial direction, but maybe you need contact conditions? Is this with respect to rigid domain? Yes I applied contact conditions but unable to give prescribed displacment in radial direction. I agree with your first sentence. Thanks very much. Shyam

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