(no subject)

hello
Can i set the velocity of a defined group to a specific value in several time steps? i need to set velocity and then relax the system

hello
Can i set the velocity of a defined group to a specific value in several time steps?

you can call the velocity command as many times as you want.

i need to set velocity and then relax the system

i don’t see why you would need to call velocity multiple times for this.

axel.

To drag the system enough and then drop it to fluctuate.


To drag the system enough and then drop it to fluctuate.

still doesn’t make sense to me. if it doesn’t work with a single add of velocities, it won’t work with multiple times. kinetic energy will fluctuate and dissipate as particles interact.

axel.

yes that’s right. it work with a single call and my problem is to unset this attributed velocity. i think its necessary to see the natural oscillation of the system.

yes that’s right. it work with a single call and my problem is to unset this attributed velocity. i think its necessary to see the natural oscillation of the system.

then why set it in the first place?

please check the documentation of the velocity command carefully. it has options to remove a net translational or rotational momentum.

axel.