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Updated: Aug 6, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Nonlinear triad interactions and the mechanism of spreading in drift-wave turbulence
O D Gürcan1, P H Diamond, T S Hahm
1Center for Astrophysics and Space Sciences and Department of Physics, University of California at San Diego, La Jolla, 92093-0424, USA.
Abstract:
We present the results of a derivation of the fluctuation energy transport matrix for the two-field Hasegawa-Wakatani model of drift wave turbulence. The energy transport matrix is derived from a two-scale direct interaction approximation assuming weak turbulence. We examine different classes of triad interactions and show that radially extended eddies, as occurs in penetrative convection, are the most effective in turbulence spreading. We show that in the near-adiabatic limit internal energy spreads faster than the kinetic energy. Previous theories of spreading results are discussed in the context of weak turbulence theory.
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