Concentration fluctuations in two-dimensional turbulence
University of Oslo, Institute of Physics - Box 1048 Blindern, N-0316
2 University of Oslo, Institute of Theoretical Astrophysics, Box 1029 Blindern, N-0315 Oslo, Norway
Accepted: 29 August 1996
The dispersion of a cloud of passive test particles in homogeneous and isotropic two-dimensional turbulence is studied by direct numerical simulation. The basic statistical properties of the concentration of the cloud are analyzed with particular attention to space-time variations in the center-of-mass frame. Approximate analytical expressions for the concentration and the concentration fluctuations can be obtained from the power spectrum of the velocity fluctuations.
PACS: 47.27.Qb – Turbulent diffusion / 92.60.Sz – Air quality and air pollution / 02.60.Cb – Numerical simulation; solution of equations
© EDP Sciences, 1996