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Turbulence Effects on Cloud Droplet Collisions in Mesoscale Convective Clouds

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1540
pages 709-712

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

H. Takagi
Department of Mechanical Engineering, Kyoto University, Yoshidahonmachi, Sakyo-ku, Kyoto 606-8501, Japan

Keiko Takahashi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan

Résumé

There is a growing consensus that the collision growth rate of cloud droplets can be increased by turbulence. We have performed numerical simulations of convective clouds to investigate the turbulence effects on cloud droplet collisions. We used the collision kernel model which we had developed to predict the collision frequency in cloud turbulence. Preliminary results of our simulations have shown that the particle collision growth is dramatically promoted by turbulence in orographic convective clouds. They have also shown that the total amount of rainfall over a mountain is significantly increased.

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