Re: [ESPResSo-users] Multi-realaxation time model

[Ulf Schiller]

On 30/06/15 08:16, Wink, Markus wrote:
> Dear ESPResSo users and developers,
> 
>  
> 
> I have a question concerning the MRT Lattice Boltzmann model used in
> ESPResSo. In MRT the linearized collision operator is transformed to
> momentum space via the collision matrix M. I have found the collision
> matrix in the file lb-d3q19.hpp.
> 
> But I didn’t find the relaxation parameters.
> 
>  
> 
> Shouldn’t there be some kind of diagonal matrix S containing the
> relaxation rates for the different moments?
> 
> Does anybody know where I can find them or tell me which relaxation
> rates ESPResSo is using for the MRT algorithm?

The relaxation rates are `gamma_shear`, `gamma_bulk`, `gamma_odd`,
`gamma_even` and are set in `lb_reinit_parameters()`.

Cheers,
Ulf

-- 
Dr Ulf D Schiller
Centre for Computational Science
University College London
20 Gordon Street
London WC1H 0AJ
United Kingdom

Phone: +44 (0)20 7679 5300