Lagrangian statistics in two-dimensional free turbulent convection

Details Lagrangian statistics in two-dimensional free turbulent convection Lagrangian statistics in two-dimensional free turbulent convection

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008njph...10g5018b&link_type=abstract

New Journal of Physics, Volume 10, Issue 7, pp. 075018 (2008).

Physics

1

Scientific paper

We discuss single-particle and two-particle statistics in two-dimensional turbulent convection in the Bolgiano Oboukhov regime by means of high-resolution direct numerical simulations. Relative separation of two particles is found to be described well by a generalization of the Richardson diffusion model. Single-particle velocity structure functions are dominated by large-scale eddies and therefore a careful analysis based on 'exit-time' statistics is necessary to identify turbulent contributions. Because the velocity field is not intermittent, small-scale acceleration statistics is found to be in good agreement with simple dimensional predictions.

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