低Re数領域にも適用可能な新しいk-εモデル : 温度成層した室内気流の数値解析に関する研究(その1)

概要

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Stable stratification is often observed in many kinds of room airflow. One typical example is the flowfield in an glass-covered atrium with large ceiling height. Stable stratification suppresses the vertical flux of heat and momentum, and also decreases the turbulence intensity of the flowfield. This flowfield is sometimes becomes pseudo-laminar. In order to predict the laminarization correctly in the vicinity of the wall, many types of low-Reynolds-number k-ε models have been proposed since Jones-Launder. In most of the previous studies, these low-Reynolds-number k-ε models have been used successfully to predict flow with laminar region near the wall. However in predicting laminar flow apart from the wall caused by stable stratification, these existing low-Reynolds-number k-ε models do not work well since they only use the non-dimensionalized distance from the wall for the near wall treatment which does not arise from the exact low-Reynolds-number effect. Therefore, in this paper, a new low-Reynolds-number model is proposed and this model is tested in applying to flowfields which have laminar region not only in the vicinity of the wall but also apart from the wall. The agreement between the results given from the proposed model and the experiment is fairly good.
社団法人日本建築学会の論文
1995-10-30