The exponential decay of homogeneous turbulence
Artikel i vetenskaplig tidskrift, 2009

Similarity equations of the spectral equations for decaying homogeneous turbulence are considered for which the similarity length scale is not allowed to grow. Two types of solutions are found: an inviscid solution and one involving viscosity. For the former, the energy decays asymptotically as t(-2), while for the latter the energy decays exponentially and the ratio of integral scale to Taylor microscale is constant. For both the spectra for fixed initial conditions collapse during decay with simply the energy and a single length scale. The exponentially decaying solution appears to provide an excellent description of the turbulence generated in recent space-filling fractal grid experiments.

fractals

isotropic turbulence

viscosity

turbulence

Författare

William George

Chalmers, Tillämpad mekanik, Strömningslära

Honglu Wang

Chrysler LLC

University at Buffalo, State University of New York

Physics of Fluids

1070-6631 (ISSN) 1089-7666 (eISSN)

Vol. 21 2 025108 (art no)-

Ämneskategorier

Strömningsmekanik och akustik

DOI

10.1063/1.3081557

Mer information

Skapat

2017-10-08