This lesson covers the formalism of the Navier-Stokes equation, the computation of energy transfers, and the concept of flux. It delves into the theory of flux and spectrum, with a focus on Kolmogorov’s theory. The lesson explains how to compute flux given the Navier-Stokes equation and the need for a profile to compute energy transfers. It also discusses the nature of flux and spectrum or energy of the Fourier modes. The lesson further explores the application of Kolmogorov’s theory in various fields including plasma turbulence and wave turbulence. It concludes with a detailed explanation of the energy spectrum in flux for 3D hydrodynamics and the limitations of Kolmogorov’s theory.

- The Navier-Stokes equation allows for the computation of energy transfers and the formalism of flux.
- The nature of flux and spectrum or energy of the Fourier modes can be understood and theorized.
- Kolmogorov’s theory is a cornerstone in understanding flux and spectrum, and it is applicable in various fields.
- The energy spectrum in flux for 3D hydrodynamics differs from 2D hydrodynamics or Magneto-Hydrodynamics (MHD) or convection.
- Kolmogorov’s theory has limitations and can be generalized to the dissipation range and laminar theory.

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