Notes on rotating turbulence
Abstract
This work investigates the turbulent constitutive relation when turbulence is subjected to solid body rotation. Laws regarding spectra and asymptotic decay of rotating homogeneous turbulence were confirmed through largeeddy simulation (LES) computations. Rotating turbulent flows exist in many industrial, geophysical, and astrophysical applications. From Lagrangian analysis a relation between turbulent stress and strain in rotating homogeneous turbulence was inferred. This relation was used to derive the spectral energy flux and, ultimately, the energy spectrum form. If the rotation wavenumber k(sub Omega) lies in the inertial subrange, then for wavenumbers less than k(sub Omega) the turbulence motions are affected by rotation and the energy spectrum slope is modified. Energy decay laws inferred in other reports and the present results suggest a modification of the epsilon model equation and eddy viscosity in kepsilon models.
 Publication:

Annual Research Briefs, 1994
 Pub Date:
 December 1994
 Bibcode:
 1994arb..nasa..107Z
 Keywords:

 Computational Fluid Dynamics;
 Computerized Simulation;
 Energy Spectra;
 Rotating Bodies;
 Turbulence;
 Turbulent Flow;
 Vortices;
 Eddy Viscosity;
 Flux Density;
 KEpsilon Turbulence Model;
 Lagrangian Function;
 Fluid Mechanics and Heat Transfer