non 0 initial velocity in solid mechanics takes no effect in stationary analysis?

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In stationary analysis, if one sets a non 0 initial velocity in solid mechanics, is that simply ignored? That is, stationary analysis doesn't at all allow straight line uniform motion with no acceleration? Or stationary analysis doesn't allow any steady motion at all?


4 Replies Last Post 31 mars 2024, 01:25 UTC−4
Henrik Sönnerlind COMSOL Employee

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Posted: 1 month ago 27 mars 2024, 06:33 UTC−4

Yes, initial velocities do not affect stationary results.

In a stationary analysis, it is necessary that there are enough constraints to suppress any rigid body motions.

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Henrik Sönnerlind
COMSOL
Yes, initial velocities do not affect stationary results. In a stationary analysis, it is necessary that there are enough constraints to suppress any rigid body motions.

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Posted: 1 month ago 27 mars 2024, 07:12 UTC−4

Thank you. Why do we sometimes see that the solution is still obtained even when there's not enough boundary conditions to suppress rigid body motions?

Thank you. Why do we sometimes see that the solution is still obtained even when there's not enough boundary conditions to suppress rigid body motions?

Henrik Sönnerlind COMSOL Employee

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Posted: 1 month ago 27 mars 2024, 08:39 UTC−4

That can sometimes happen if there are 'enough' numerical inaccuracies so that the stiffness matrix is not identified as singular. Also, sometimes an iterative equation solver can happen to find a solution.

When it happens, there is typically an arbitrary rigid body superimposed over the deformations.

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Henrik Sönnerlind
COMSOL
That can sometimes happen if there are 'enough' numerical inaccuracies so that the stiffness matrix is not identified as singular. Also, sometimes an iterative equation solver can happen to find a solution. When it happens, there is typically an arbitrary rigid body superimposed over the deformations.

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Posted: 4 weeks ago 31 mars 2024, 01:25 UTC−4

Thank you

Thank you

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