冰盖下冰花浓度分布的数值模拟
Journal of Glaciology and Geocryology(2012)
Abstract
封冻河道内的冰花分布规律对冰期水文及环境分析有着重要的意义.视冰花为连续介质,基于多相流理论和欧拉-欧拉模型方法,建立了河渠垂向二维标准k-ε紊流数值模型.在不同的水流流速、冰花颗粒尺寸、上游来冰量条件下,对冰盖下冰花浓度场进行了模拟分析,得到了冰盖下冰花分布特征.结果表明:水流流速越大,冰花沿垂向分布范围越大,冰花浓度分布曲线斜率越大,冰花浓度沿垂向的均匀性越大,同时浓度最大值越小;冰花颗粒尺寸越大,冰花沿垂向分布范围越大,冰花浓度分布曲线斜率越大;上游来冰量越大,冰花沿垂向分布范围越大,在同一水深其浓度值也越大,冰花浓度沿垂向分布的均匀性越大.
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Key words
frazil concentration,solid-liquid two-phase flow,ice cover,numerical simulation
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