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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › *INITIAL_VELOCITY_GENERATION_START_TIME › Reply To: *INITIAL_VELOCITY_GENERATION_START_TIME

November 7, 2024 at 1:28 pm
Ram Gopisetti
Ansys Employee

Hi, 

It appears the only issue arises from the usage of *INITIAL_VELOCITY_GENERATION_START_TIME in conjunction with *INITIAL_VELOCITY_RIGID_BODY.

*INITIAL_VELOCITY_RIGID_BODY is incompatible with *INITIAL_VELOCITY_GENERATION_START_TIME. Instead, you should use *INITIAL_VELOCITY_GENERATION with PHASE=1, scoped to the rigid body. This allows you to define the velocity generation, and then apply *INITIAL_VELOCITY_GENERATION_START_TIME to introduce a delay before the velocity is activated.

For additional details, please refer to the *INITIAL_VELOCITY_GENERATION_START_TIME section in the LS-DYNA Manual, Volume 1.

Cheers, RamÂ