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Global Rigid Body

Hi,

I am trying to simulate a rollover of simple box under gravity using global rigid body. If I do not make global rigid body and simply assign the boundary conditions like gravity, the model is solving properly and getting the desired results. However If am modelling the same by making global rigid body on the box , I am getting initial time step itself as a 1 e+06 and the job gets completed after the first cycle itself.

Can anyone let me know for the same.

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Radioss

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Altair Forum User

can you please share the model file

gopal_rathore

Unable to find an attachment - read this blog

gopal_rathore

Hi,

Please find the attached files of the model.

Altair Forum User

make the platform and the other component separately fixed with the rigids and try, rather than going for a global rigid for all components.

gopal_rathore

Hi,

Thank you for your input.

I have applied a boundary condition (fully fixed) at the platform rigid node and the global rigid body is only on the box component. One thing is if you check the .out file of starter, the nodal steps are coming very high e+09 for nodes other than two rigid master nodes which I think is creating problem here.

Altair Forum User

Yes, I noticed

gopal_rathore

Hi,

On performing several iterations, I noticed that the boundary condition applied to the platform through a rigid body is creating a problem. If I assign the same boundary condition individually to the nodes of the platform, it works fine. If it is applied on the rbody of the platform, the problem comes. There is an interface also involved type 7 . I am not sure why this happens.