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LES OF THERMALLY-STRATIFIED LIQUID TURBULENT FLOWS WITH A CHEMICAL REACTION

Ryo Onishi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan also Department of Aeronautics, Imperial College London, SW7 2AZ, UK

Takenobu Michioka
Department of Mechanical Engineering, Kyoto University, Kyoto 606-8501; Environmental Science Research Laboratory Central Reseach Institute of Electric Power Industry 1646 Abiko, Abiko, Chiba, 270-1194, Japan

Kouji Nagata
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, 464-8603, Japan

Satoru Komori
Department of Mechanical Engineering and Science Kyoto University Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8140, Japan

Resumo

Two types of reacting liquid turbulence with density stratifications; a mixing layer and grid-generated turbulence, were numerically investigated using large-eddy simulation (LES). The present LES employed the dynamic SGS models for the SGS Reynolds stress and SGS mass and heat fluxes and our SGS model for the chemical reaction source term (Michioka et al., 2001). The LES based on these SGS models was applied to the same stratified reacting liquid turbulent flows as in our recent experiments (Onishi et al., 2003). To examine the applicability of the present LES, the predictions of some turbulence statistics were compared with the measurements by Onishi et al. (2003).
The results show that the LES predictions are in good agreement with the measurements and the present LES can accurately estimate buoyancy effects on the diffusive-reactive mechanism in thermally-stratified reacting liquid turbulent flows.