Contact Energy and Parameters

Altair Forum User

Can any explain the pros and cons of using Igap2 vs Igap3 in type 7 contact (crash analysis)?

Thanks.

Altair Forum User

Hi Ray,

 

Size of the mesh is taken into account to avoid initial penetration if you use Igap= 3, but this is not the case with Igap= 2

 

Altair Forum User

Thank you Prakash for your reply.

The explanation for Igap explains the mesh size consideration. I was wondering if this has been explained in theory of how the Contact algorithm works and the effects of the Igap parameter on the overall simulation- contact, energy balance and the difference in the results.

Thanks.

Altair Forum User

Hi Ray,

 

This is available on RADIOSS help, but effects are not.

If I_gap=3, a variable gap is computed as:

EQ. 6.

max{Gapmin,min[Fscalegap⋅(gs+gm),%mesh_size⋅(gs_l+gm_l),Gapmax]}