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Re: [ESPResSo-devel] incorrect velocity scaling for slip lbboundary

From: Ivan Cimrak
Subject: Re: [ESPResSo-devel] incorrect velocity scaling for slip lbboundary
Date: Fri, 8 Dec 2017 11:12:38 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

Hi Kai,

Indeed I did the tests with LB_CPU. Sorry I forgot to mention this. (The tests were done with the current github version of the python branch, with LB and LB_BOUNDARIES compiled in).


On 08/12/2017 11:08, Kai Szuttor wrote:
Hi Ivan,

I just checked your test with GPU LB and there the velocity comes out
correct, so it seems to be a problem of CPU LB.

I'll have a look.


On Fri, Dec 08, 2017 at 08:56:03AM +0000, Ivan Cimrak wrote:
Hey guys,

Is it possible to have incorrect velocity scaling for slip boundary
conditions? I took an example script (attached) from section "10.10. Setting
up boundary conditions" from ESPResSo online documentation:

I added the printing of the velocity near the right slip wall and after
reaching steady state it shows almost 100 times larger velocity as it is
supposed to be (0.941 or so instead of 0.01). This behaviour is linked with
lb timestep which was 0.01. Increasing to timestep=0.1 gives only 10times
higher velocity.

Could you comment on this?

Many thanks,


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