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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: |
Thu, 25 Jan 2018 15:00:58 +0100 |
Hi Ivan,
This issue is on our agenda. I already had a look but could not find the source
of the wrong velocity.
We hope to be able to resolve it soon.
Best,
Kai
> On 25. Jan 2018, at 14:43, Ivan Cimrak <address@hidden> wrote:
>
> Hi guys,
>
>
> In December I posted here comment on incorrect scaling of velocity at
> lbboundary. Kai checked this on GPU, it was correct, however for CPU it is
> still wrong. Please see my mail below. I am adding a sample script.
>
>
> Thanks,
>
> Ivan
>
>
> 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.
>>
>> Cheers,
>>
>> Kai
>> 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:
>>>
>>> http://espressomd.org/html/doc/lb.html
>>>
>>> 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
>>>
>>
>
> <test_from_documentation.py>
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