长江科学院院报2017，Vol.34Issue(7)：60-64,5.DOI:10.11988/ckyyb.20160346
斜坡上的密度流数值模拟研究
Numerical Simulation of Density Current on a Slope
米博宇 1张小峰 1任实2
作者信息
- 1. 武汉大学 水资源与水电工程科学国家重点实验室,武汉 430072
- 2. 中国长江三峡集团公司,湖北 宜昌 443133
- 折叠
摘要
Abstract
A vertical two-dimensional RNG k-ε turbulent model is established and its reasonability and accuracy are verified by comparison with existing experimental data.Density current on a slope in the presence of different slope gradients and discharges is simulated, and results reveal that 1) the head velocity of density current has a function relationship with the slope gradients, and there is an optimal slope gradients which maximizes the head velocity under the same condition;2)the relation between head velocity and the cubic root of buoyance flux is not a strict proportional function, deviating under small or large discharge;3)the head shape is enlarged in the motion process of density current, and the ratio of thickness to length of the head decreases gradually;4)the growth rate of the head increases with the increase of slope gradients and discharges, and finally tends to a steady rate.These results could help further understand the motion pattern of density current on slope.关键词
密度流/斜坡/头部流速/数值模拟/RNGk-ε紊流模型Key words
density current/slope/head velocity/numerical simulation/RNG k-ε turbulent model分类
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米博宇,张小峰,任实..斜坡上的密度流数值模拟研究[J].长江科学院院报,2017,34(7):60-64,5.
