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INFLUENCE OF CAVITATION ON TURBULENT SEPARATED FLOW

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

Hiroki Sakai
Graduate School of Engineering, Osaka University

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

Abstrakt

Attention was focused on the interaction between vortex and cavitation as a basic study on modeling unsteady turbulent flows with cavitation. First, separated shear layer with cavitation were directly simulated. Cavitation caused by spanwise and streamwise vortices, which are typical features in high shear layer, was represented by a simple model. Experimentally observed tendencies in the location of vortex formation, the frequency of vortex shedding and the intensity of Reynolds stresses were reasonably reproduced. Influence of cavitation on a typical example of streamwise vortex was observed. It was found that the vorticity in the core of Burgers type vortex was significantly reduced. To establish a description of it, we used an artificially maintained Burgers vortex. As a result, an assumption of constant circulation along a closed circle expanding due to sudden development of cavity could represent the modification of the vortex.