I am adding more details to my query above. I have observed that if I remove automatic_single_surface contacts from model than I am not getting the same error. Can anyone suggest, what might be the possible problem causing this negative volume?
I am trying to run my model without any boundary condition or forces (ie gravity, damping etc). I am getting error/warning message of "negative volume in solid element 123456 cycle 151 time= 9.815e-02" for hundreds of elements and I observe those elements get eroded. This is really confusing as...