Europhys. Lett, 36 (2), pp. 99-104 (1996)
Concentration fluctuations in two-dimensional turbulence
B. Krane , H. L. Pécseli and J. Trulsen
University of Oslo, Institute of Physics - Box 1048 Blindern, N-0316
University of Oslo, Institute of Theoretical Astrophysics, Box 1029 Blindern, N-0315 Oslo, Norway
(received 28 March 1996; accepted in final form 29 August 1996)
PACS. 47.27Qb - Turbulent diffusion.
PACS. 92.60Sz - Air quality and air pollution.
PACS. 02.60Cb - Numerical simulation; solution of equations.
Abstract: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.
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