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LES study of turbulent energy flux in a free circular jet

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.480
5 pages

Boris B. Ilyushin
Kutateladze Institute of Thermophysics SB RAS, Lavrentyev ave., 1, 630090, Novosibirsk; and Nuclear Safety Institute of RAS, Moscow, Russia; Novosibirsk State University, Novosibirsk, Russia

Denis V. Krasinsky
Kutateladze Institute of Thermophysics SB RAS, Lavrentyev ave., 1, 630090, Novosibirsk; and Nuclear Safety Institute of RAS, Moscow, Russia

Michael Hrebtov
Institute of Thermophysics of SB RAS,Ac. Lavrentieva ave. 1, Novosibirsk, Russian Federation, 630090; Novosibirsk State University, Pirogova st., 2, Novosibirsk, Russian Federation, 630090

Résumé

Large Eddy Simulation of free circular turbulent jet at Re=25000 has been performed with emphasis on investigation of spectral energy flux properties, including analysis of second-order and third-order structure functions. It has been shown the presence of a zone within the jet initial region where turbulence dynamics exhibits two-dimensional features that could not be caused by external anisotropy conditions. LES predictions have demonstrated that the third-order longitudinal velocity structure function takes positive values inside this zone and the corresponding power spectrum of turbulent pulsations follows the E(k) ∼ k−3 law that is specific for two-dimensional turbulence.

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