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 Sep 3 comment Realistic Ocean Shears In near surface, it's probably change in function of the sea sates condition and meteorology condition. Sep 3 comment Realistic Ocean Shears @Ali why it is not the proper site for this question? Aug 23 comment In turbulence theory, what happens if i take space average of fluctuating part? Do you want: 1) the space average of the fluctuating parts in the time-average decomposition or 2) the space average of the fluctuating part in a space average decomposition. I understand that you want 1) but looking at the other answer I'm not sure it is clear. Aug 22 comment In turbulence theory, what happens if i take space average of fluctuating part? LES (Large Eddy Simulation) is a filtering not an averaging (see en.wikipedia.org/wiki/Large_eddy_simulation) Jun 25 comment Ratio of horizontal to vertical kinetic energy in ocean Interesting answer. I guess that apply to the large scale part of the spectra. Apr 26 comment Can vorticity be destroyed? Can you explain what you mean by cancel out? Is that mean that the dissipation term is 0? Apr 25 comment 2-D Turbulence - how does it look like? After learning the basic of fluid dynamics you can look into the Annual Review of Fluid Mechanics entitled Two-Dimensional Turbulence (Vol. 44: 427-451). All the answer of your question are in it. Apr 25 comment Navier-Stokes system Should'n be partial derivatives? Apr 25 comment Navier-Stokes system That not the conventional Navier-Stokes system because it's missing the time derivative. Nov 3 comment If there is significant temperature difference between indoor air and outdoor air, will that significantly increase the rate of air exchange? In Rayleigh-Bénard instability the fluid at the bottom is heated, this have for effect to decrease the density of the fluid at the bottom, when the gradient become strong enough the instability take place. So yes the fluid have larger density at the top and lower density at the bottom. Using the Boussinesq approximation, the relation used between the density and the temperature is $\rho=\rho_0 \beta T$ with $\rho_0$ the characteristic density, $\beta$ the thermal coefficient (negatif) and $T$ the temperature fluctuation. Nov 2 comment Change in appearance of liquid drop due to gravity I'm not sure I exactly understand your question but maybe that can be interesting ems.psu.edu/~fraser/Bad/BadRain.html Nov 2 comment If there is significant temperature difference between indoor air and outdoor air, will that significantly increase the rate of air exchange? According to the wikipedia definition the Rayleigh-Taylor configuration is just two fluid of different density separated by an interface that occur when the lighter fluid push the denser fluid, the Rayleighâ€“Bénard instability configuration is denser fluid in the top of lighter fluid. I guest in some sense it's can be a RT, for me it's look like frontal instability generating gravity current. Sep 20 comment Ratio of horizontal to vertical kinetic energy in ocean a tag oceanography would be nice Feb 17 comment Reynolds number with hyper-viscosity @tpg2114 no, I should have, thanks for your comment.