UC San Diego
Nonlinear triad interactions and the mechanism of spreading in drift-wave turbulence
- Author(s): Gürcan, OD
- Diamond, PH
- Hahm, TS
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevLett.97.024502
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. © 2006 The American Physical Society.
Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.