how to make a particle spin?

Submitted by chengqiccc on Sun, 01/08/2017 - 13:21

Hi all,

I'm new to LIGGGHTS. I want make a particle spin in the simulation.
At first, the atom_style in my simulation is granular. Under these circumstances, I set the angular velocity via "velocity......setAngular......" , and the terminal give a feedback:

"set Angular requires the atom property 'angmom' as defined by atom_style ellipsoid. (../velocity.cpp:426)"

Then I use atom_style "ellipsoid", but the terminal give a feedback this time:

"Fix wall/gran (id boxwalls_x1): requires atom attributes radius, omega, torque (../fix_wall_gran.cpp:107)"

I don't know how to solve it.

Can anybody tell me how to make a particle spin in the simulation?

Thanks.

Forums:

Daniel Queteschiner | Mon, 01/09/2017 - 09:52

Use the set command with the options omegax, omegay, omegaz to set the angular velocity. Alternatively, set the angular velocity upon insertion via the fix insert* commands. You cannot use the 'ellipsoid' style with the granular contact models, just 'granular' or 'sphere'.