Dear Pedram,
Thank you for your advice.
I checked the correctness of the initial velocity assignment in my model - everything is set correctly there.
It was not by chance that I applied the term "unpredictable" to the assignment of the initial velocity for a rigid body.
I have already had several cases when the model correctly perceives the direction of the initial velocity, but then - in the process of some changes in the model, the specified direction of the initial velocity is perceived by LS-DYNA as the opposite, although I did not redefine the direction of the initial velocity.
*** Unfortunately, I have never been able to "fix" - at what stage of the model change LS-DYNA stops correctly perceiving the specified direction of the initial velocity.
As for your advice - to set the initial velocity for a specific part of the model - I will try to do this now and will write to you about the results.
Regards Valery
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