On Thu, Mar 11, 2021 at 05:38:33PM +0000, Ahmad Reza Motezakker wrote:
> I have a single spherical particle coupled with LB fluid. I have activated rotation =(1,1,1) and defined inertia for the particle. When I analyse angular mean squarred displacement, I realize that the rotation behavior repeats itself (please check the attached
schematic image). To make sure, I visualized the particle with an arrow fixed to the particle. I really appreciate that if you could share with me your thoughts. Thank you.
Is this a single point particle or a raspberry?
You'd need the latter to get rotational diffusion. Please see the papers by J. de Graf, for example.
For a point pparticle with the LB thermostat, Espresso will just apply Euler's eqn for rotation without any friction.