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Some considerations on numerical experiments of thermal convection in the northern part of lake Biwa by means of stochastic model

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2250
7 pages

Takashi Hosoda
Department of Urban Management, Kyoto University, C1-3, Kyodai-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

T. Isono
Audit Account Bureau, Government of Japan, 3-2-2 Kasumigaseki Chiyoda-ku, Tokyo 100-8941,Japan

F. P. Malembeka
Department of, Urban Management, Graduate School of Engineering, Kyoto University, C1-3, Kyodai-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

Abstract

This paper describes the fundamental characteristics of vertical heat transfer due to thermal convection during the cooling period (September to February) in the northern part of Lake Biwa. It is well known that the thermal convection during the cooling period is the main mechanisms of DO transfer from the water surface to the bottom of lake. The mixing mechanism caused by thermal convection is investigated numerically using 3-D CFD model. It is shown that thermal convection cells are observed in the computational domain, changing the positions of submerging portion temporally. Then, a stochastic model with Monte-Carlo simulation is proposed to consider the results of numerical experiments. It is pointed out that the characteristics of the spatial flow patterns with Fractal structure are reproduced by the model.

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