Learning Forum

[moritz.ursprung]

Hello,

I am running a simulation with LS-DYNA in the workbench. To achieve convergence I need to allow for some penetration. But after the simulation I want to create a Fluid domain from the deformed geometry. There I don't want any penetration between the bodies, as this might lead to small gaps, which are difficult to mesh.

So my question is: Is the a possibility to define a contact offset between to contacting bodies as there is in Mechanical?

Thanks in advance

Moritz

[ErKo]

 

 

 

Hello

Not sure I follow but you should be able to resolve the penetration and then you can export the deformed gemoetry where all is resolved and use that to build your fluid domain perhaps.

Perhaps others that have done this have some more feedback – please explain more perhaps add images for aid and better understanding (explain e.g., if it is shells or solids, why they need initial pen. for convergence so is it implicit ls-dyna, etc.).

All the best

Erko

 

 

 

[moritz.ursprung]

Hi Erko,

I'm not sure if it was clear what I am looking for. In mechanical there are these options

If an offset is applied the contacting bodies are acting like they are in contact and forces, etc are transmitted, but the bodies still have a gap between them. 

I would like to use this (if there is such an option in LS-DYNA) to make up for the penetration. 

Or is it possible to increase the contact stiffness after all the forces and displacements have been simulated in order to get rid of the penetration in an additional step?

Best regards

Moritz

[ErKo]

Hi

Insert a manual contact and right mouse button click on it and add LS properties - there choose an interference contact and use dynamic relaxation to try and resolve interf.

12.13.1. Keywords Created from the Contact Properties Object

All the best

Erko