Boundary condition for a large motion case

[Léonhard YU]

Dear all,

 I try to calculate a roatating cantilever plate case like this [Liu and Hong, Mech. Res. Commun., 2005(10.1016/j.mechrescom.2004.10.007)]

and the rotating speed is defined with

where \omega_0 = 0, \omega_s = 10rad/s, t_s = 5s.

 

 I am not sure whether for this case, with large overall motion, I should use a boundary for the root like step-18 IncrementalBoundary or just clamped with ZeroFunction.

 

 Best Regards,

 Leo

[Wolfgang Bangerth]

On 4/18/25 02:52, Léonhard YU wrote:
>  I try to calculate a roatating cantilever plate case like this [Liu
> and Hong, Mech. Res. Commun., 2005(10.1016/j.mechrescom.2004.10.007)]
>

> Screenshot 2025-04-18 104514.png
> and the rotating speed is defined with

> Screenshot 2025-04-18 104809.png
> where \omega_0 = 0, \omega_s = 10rad/s, t_s = 5s.
>  I am not sure whether for this case, with large overall motion, I
> should use a boundary for the root like step-18 IncrementalBoundary or
> just clamped with ZeroFunction.

Leonhard: This is a modeling question. What it is you need to do depends
on what kind of situation you are trying to mathematically describe.
This is not something we can know -- only you can.

Best
W.