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DNS AND LES OF CAVITATING TURBULENT FLOW

Kie Okabayashi
Japan Aerospace Exploration Agency (JAXA), 7-44-1 Jindaiji-Higashimachi, Chofu, Tokyo 182-8522, Japan

Takeo Kajishima
Department of Mechanical Engineering, Osaka University, 2-1 Yamada-oka, Suita-city, Osaka 565-0871 Japan

Takashi Ohta
Department of Mechanical Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871; Department of Mechanical Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan

Abstract

The two-way interaction between cavitation and turbulence was investigated by the direct numerical simulation of a spatially-developing mixing layer. Namely, the vortical structure and turbulence intensity were compared between single-phase and cavitation conditions. Cavitation mainly occur in the regions of low pressure which are corresponding to vortices. In the braid region, turbulence intensity tends to decrease in comparison with the non-cavitating condition. This decreasing is explained by suppressed energy redistribution by less pressure fluctuation and vortex modification under the cavitating condition. In the fully developed region, on the other hand, collapse of cavity causes velocity fluctuation, so turbulence intensity tends to increase in comparison with single phase flow.