[Nek5000-users] DNS of turbChannel

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

Yes it will turn it off. 
I agree this depends on the resolution. If you are really well resolved dealising is typicaly enough to make it stable otherwise you have to add filtering. 

-----Original message-----
> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> Sent: Saturday 10th February 2018 10:52
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] DNS of turbChannel
> 
> 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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