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Re: [ESPResSo-users] Multi-realaxation time model
From: |
Ulf Schiller |
Subject: |
Re: [ESPResSo-users] Multi-realaxation time model |
Date: |
Tue, 30 Jun 2015 08:22:44 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
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