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A quick google research (link) gives some references. As far as I can understand, to premultiply allows to filter the spectrum and identify a result on a specific wave number range. For instance, by defining the energy spectra by $E(k,t)$, the kinetic energy dissipation $\varepsilon$ and the wave number $k$, you can try to find scalings in the inertial ...

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OKay, so I read this question and thought "There's no darn way that they mean 'turbulence' in the scientific sense!" But then I did a quick literature search and found Turbulent Luminance in Impassioned van Gogh Paintings. In the paper, they compare the probability density function (PDF) of four paintings from the same era of van Gogh's life to the ...

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I saw the same article and was not impressed. The author seemed to imply that Van Gough was using the shape of vorticies shedding off of a cylindrical cross section in a moving fluid as the basis for the shape of the stars in his painting. Even if there had been some scientific observation of vortex shedding (and there may well have been) at that time, ...

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