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Re: Repetetive rotation behaviour of a particle

From: Rudolf Weeber
Subject: Re: Repetetive rotation behaviour of a particle
Date: Thu, 11 Mar 2021 19:27:42 +0100

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.

Regards, Rudolf

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