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Mar 11, 2013 · 7. Turbulence is not one of the great unsolved problems in physics. Physics tells us exactly how turbulence emerges as a direct consequence of local mass and momentum conservation. We can create multiparticle computer models such as lattice gas automata that generate turbulence at large length and time scales.
In addition to Pope's book, you could take a look at the chapter 5 of Lesieur's book Turbulence in Fluids on the Fourier Analysis of Homogeneous Turbulence. You could also find useful (and a bit complex) tools on anisotropic decomposition of turbulent field in the chapter 2.6 of the book Homogeneous Turbulence Dynamics by Sagaut & Cambon. (I ...
May 27, 2018 · Basically, the scale of a certain parameter is the order of magnitude of that parameter. Being able to determine the scales of a parameters in a complex system (like turbulence problems) is very useful.
Oct 2, 2020 · Different wavenumbers correspond to different length scale fluctuations. One of the basic ideas of turbulence is that energy cascades from large to small scales, thus, a spectrum of different wavenumbers play a role. In turbulence what to we mean that an eddy has a wavenumber k? ϕ = k ⋅x − ω t ϕ = k ⋅ x − ω t ϕ ϕ k k x x ω ω t t ...
Feb 27, 2022 · 1. Exactly. To mantain turbulence in navier stokes the system need some external force. "Honey is less turbulent than water", in the sense that the energy cascade is faster and the dissipation length is bigger... very soon there is no turbulence (or even motion) at all. Turbulence without external forces is possible in perfect fluids (perfect ...
Apr 9, 2018 · Now I am confused about why we cant observe this crater on the moon - we know it subtends an angle of 0.93": this is greater than the minimum angular resolution of the telescope. the turbulence increases its diameter (due to its affect on the point source), so the angle subtended is still greater than minimum angular resolution implying it can ...
Apr 7, 2018 · Apr 8, 2018 at 15:46. Add a comment. is a mathematical technique to separate the average and fluctuating parts of Relativistic Turbulent Flows. τ. Where the τ τ is proper time. Where the Uμ U μ denotes the proper time average called steady component and Uμ U ′ μ is fluctuating part. There are turbulence، When fluctuating part is equal ...
Feb 24, 2011 · The basic Kolomogorov theory is a mean-field theory -- dissipation rate is considered to be constant over the whole volume of liquid.
This does create turbulence which, simply put, would reduce the velocity of the wind hitting the turbine thus lower output can be taken from the turbine. The most important variable for wind turbine efficiency is the wind speed and in this case you will have a lower windspeed, because the walls would cause turbulence and there will be already ...
其实，对于 “turbulence”这个词来说，“紊流”和“湍流”这两个翻译的意思是差不多的。但是，对于南方派系的科学家们（例如魔都西南某高校的老教授等）发不出来“湍(tuan一声)流”这个音，总是发成“喘(chuan三声)流”，所以这些老科学家就叫成“紊流”。而（以清华、北大为首的）京派科学家 ...
