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- W4225596244 abstract "In turbulent flows, kinetic energy is transferred from the largest scales to progressively smaller scales, until it is ultimately converted into heat. The Navier-Stokes equations are almost universally used to study this process. Here, by comparing with molecular-gas-dynamics simulations, we show that the Navier-Stokes equations do not describe turbulent gas flows in the dissipation range because they neglect thermal fluctuations. We investigate decaying turbulence produced by the Taylor-Green vortex and find that in the dissipation range the molecular-gas-dynamics spectra grow quadratically with wave number due to thermal fluctuations, in agreement with previous predictions, while the Navier-Stokes spectra decay exponentially. Furthermore, the transition to quadratic growth occurs at a length scale much larger than the gas molecular mean free path, namely in a regime that the Navier-Stokes equations are widely believed to describe. In fact, our results suggest that the Navier-Stokes equations are not guaranteed to describe the smallest scales of gas turbulence for any positive Knudsen number." @default.
- W4225596244 created "2022-05-05" @default.
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- W4225596244 date "2022-03-14" @default.
- W4225596244 modified "2023-09-30" @default.
- W4225596244 title "Navier-Stokes Equations Do Not Describe the Smallest Scales of Turbulence in Gases" @default.
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- W4225596244 doi "https://doi.org/10.1103/physrevlett.128.114501" @default.
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