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

From: Kai Szuttor
Subject: Re: [ESPResSo-devel] incorrect velocity scaling for slip lbboundary
Date: Fri, 8 Dec 2017 11:08:58 +0100
User-agent: NeoMutt/20170714-126-deb55f (1.8.3)

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,
> Ivan

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