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Ansys Learning Forum › Forums › Installation and Licensing › Ansys Products › Lsdyna rolling process,negative volume › Reply To: Lsdyna rolling process,negative volume

November 21, 2024 at 3:08 pm
pedram.samadian
Ansys Employee

Hi,

It can have several reasons, including large time steps, inappropriate material model, contact issue, and so on. Please use the provided advice in the previous comments. For mass scaling, use the *CONTROL_TIMESTEP card in the LS-DYNA to ensure the time step adheres to the Courant’s stability criterion. Revisit the defined contact parameters. Use a proper value for the parameter “Soft” in the optional card A for the contact defintion. 

Details about the mentioned cards can be found in the LS-DYNA Keyword User’s Manual Vol. 1 (LSDYNA Manuals).

Thanks,

Pedram