Subgrid

Comp. article by Browning and Kreiss cited earlier (that you obviously have not done), you will see very clearly that the only way to run the NS equations without the correct small physical dissipation (kinematic viscosity) is by using a larger unphysical viscosity (what you call a subgrid scale sink of energy) and this alters the spatial spectrum of the solution as clearly shown in the Math. ❋ Unknown (2007)

There one can see that these fitered equations contain a so-called subgrid-scale stress/dissipation term. ❋ Unknown (2007)

In addition to the explicitly resolved scales of motions, the models also contain parametrization schemes representing the so-called subgrid-scale processes, such as radiative transfer, turbulent mixing, boundary layer processes, cumulus convection, precipitation, and gravity wave drag. ❋ Unknown (2005)

But not including some kind of subgrid model or eddy mixing parameter is not correct either. ❋ Unknown (2007)

So, I think also for these class of problems it should be possible to develop some kind of subgrid models. ❋ Unknown (2007)

So let us assume we have a spatial filter (I will denote it by .) which doesn’t touch the large scales (larger than the grid size) but takes an average over the small unresolved scales (the so called subgrid scales). ❋ Unknown (2007)

The importance of small/subgrid-scale processes on large-scale behavior should also be emphasized. ❋ Unknown (2009)

Recent advances in stand-alone sea-ice modeling, including those in modeling sea-ice thermodynamics (e.g., introducing the effects of subgrid-scale parameterizations with multiple thickness categories – the so-called "ice-thickness distribution"), are now being incorporated into AOGCMs. ❋ Unknown (2009)

If none of those 4 ways can lead to a viable solution, then we know fer sure that a 3x3 sudoku subgrid can never sum to 1000. ❋ Unknown (2009)

Therefore, it is not possible for any proper 3x3 sudoku subgrid to sum to 1,000. ❋ Unknown (2009)

Colleagues engaged in large-scale and meso-scale meteorological modeling know this problem that also occurs in the parameterization of subgrid scale processes. ❋ EliRabett (2008)

And it is not true that it is impossible evaluate how unphysical/physical these subgrid models are. ❋ Unknown (2007)

There is no strict requirement that the subgrid scales should be isotropic in LES. ❋ Unknown (2007)

Numerical fluid dynamics codes with these subgrid models produce results that match experimental measurements quite well in general. ❋ Unknown (2007)

A subgrid model is meant to describe this process. ❋ Unknown (2007)

However, a subgrid parameterization models in fact an existing physical process. ❋ Unknown (2007)

Do you claim that a numerical model of turbulence with and without a parameterization for the subgrid scales should converge to the same solution? ❋ Unknown (2007)

However, the manuscript also demonstrates that the solution is impacted by the type of dissipation or subgrid scale sink of enstropy and this was one of the major points of the manuscript. ❋ Unknown (2007)