Learning Forum

[valerym.m5]

I am solving a problem about a load falling (rigid body) onto a deformable body.

I need to set the initial velocity (*INITIAL_VELOCITY_RIGID_BODY) of the load with a time delay using *INITIAL_VELOCITY_GENERATION_START_TIME.

Unfortunately, LS-DYNA (R15) does not accept this command.

[Ram Gopisetti]

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, Ram