[Nek5000-users] Sub-grid turbulent kinetic energy

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

ok, for the hpf model the only way to get the SGS dissipation would be 
to calculate the TKE budget, and look for the missing contribution which 
is then due to the SGS term. For eddy viscosity models, you can 
calculate the SGS dissipation using eps_sgs=tau_ij * S_ij with tau_ij 
being the SGS tensor.
Does this help?
Philipp

On 2018-10-19 13:47, nek5000-users at lists.mcs.anl.gov wrote:
> I'm currently using the hpfrt model but am planning to try out a couple 
> (such as dynamic Smagorinsky) in the future.  Cheers, Daniel
> 
> 
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>     1. Sub-grid turbulent kinetic energy
>        (nek5000-users at lists.mcs.anl.gov)
>     2. Re: Sub-grid turbulent kinetic energy
>        (nek5000-users at lists.mcs.anl.gov)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 10 Oct 2018 14:39:47 +0000
> From: nek5000-users at lists.mcs.anl.gov
> To: "nek5000-users at lists.mcs.anl.gov"
>          <nek5000-users at lists.mcs.anl.gov>
> Subject: [Nek5000-users] Sub-grid turbulent kinetic energy
> Message-ID:
>          <mailman.12319.1539182408.86639.nek5000-users at lists.mcs.anl.gov>
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> 
> Hi,
> 
> 
> I'm trying to compute the efficacy of my LES and would like to do this 
> by considering the ratio of turbulence kinetic energy both on the grid 
> and sub-grid.  Is there an option within NEK (maybe in .par) to include 
> the amount of sub-grid TKE as an output from the simulation itself, so 
> that I can directly compare it to the computed on-grid TKE?
> 
> 
> Cheers,
> 
> 
> Daniel Ward
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> Message: 2
> Date: Wed, 10 Oct 2018 17:27:29 +0200
> From: nek5000-users at lists.mcs.anl.gov
> To: nek5000-users at lists.mcs.anl.gov,    "nek5000-users at lists.mcs.anl.gov"
>          <nek5000-users at lists.mcs.anl.gov>
> Subject: Re: [Nek5000-users] Sub-grid turbulent kinetic energy
> Message-ID:
>          <mailman.12339.1539187154.86639.nek5000-users at lists.mcs.anl.gov>
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> 
> Hi, what SGS model are you using? Just the filtering?
> Philipp
> 
> On October 10, 2018 4:39:47 PM GMT+02:00, 
> nek5000-users at lists.mcs.anl.gov wrote:
>>Hi,
>>
>>
>>I'm trying to compute the efficacy of my LES and would like to do this
>>by considering the ratio of turbulence kinetic energy both on the grid
>>and sub-grid.  Is there an option within NEK (maybe in .par) to include
>>the amount of sub-grid TKE as an output from the simulation itself, so
>>that I can directly compare it to the computed on-grid TKE?
>>
>>
>>Cheers,
>>
>>
>>Daniel Ward
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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