The Effects of Finite Lifetime of Passive Scalars and Vorticity on Their Power Spectra
Keeyeol Nam,a Thomas M. Antonsen, Jr.,a,b Parvez N. Guzdar,a Edward Otta,b
a. Department of Physics and Institute for Plasma Research, University of Maryland, College Park, MD 20742, USA
Department of Electrical Engineering and Institute for Plasma Research, University of Maryland, College Park, MD 20742, USA
Physica A 288, 265-279 (2000)
Abstract. The power law exponent for the wave number power spectrum of a passive scalar field with finite lifetime in Lagrangian chaotic flows and the entrophy spectrum of two-dimensional Navier-Stokes turbulence with drag are investigated. The power law exponents are related to the distribution of finite-time Lyapunov exponents and the finite lifetime (or the drag coefficient).