[Nek5000-users] DNS of turbChannel

[nek5000-users at lists.mcs.anl.gov]

does "filtering=no" turn off the filtering completely? As far as I 
understand, even for DNS* some low amounts of filtering is needed (1% or 
so). Or is that not true any longer?

Philipp

* Of course, the true definition of DNS might be a bit unclear; we 
typically say that a DNS resolves all relevant scales of motion, but 
what are these, really?

On 2018-02-09 21:12, nek5000-users at lists.mcs.anl.gov wrote:
> The turbChannel example is using a high pass filter relaxation term as SGS. For a DNS just
> 
> - set lx1=8 and lxd=12 in SIZE
> - generate a finer mesh with more elements using genbox (if you change the mesh make sure to delete the old amg files)
> - set filtering=no in par
> 
> 
> -----Original message-----
>> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
>> Sent: Friday 9th February 2018 20:32
>> To: nek5000-users at lists.mcs.anl.gov
>> Subject: Re: [Nek5000-users] DNS of turbChannel
>>
>> Hello Paul,
>> Thank you a lot for your explanation; it really helps. For now, I am using the most recent turChannel example of NEK5000 V.17. I successfully simulated a turbulent channel with a Retau of 180 using 1536 elements (I am aware of its a lot
>>   of elements). The default settings were applied. I wonder is it in the .par file where you do the modification to convert it into DNS? Or somewhere else as well?
>> Again, thank you for the help,
>> Emily
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