Interaction between open-channel flow and the wind over the surface
明渠水流与水面风之间的相互作用
基本信息
- 批准号:07640580
- 负责人:
- 金额:$ 1.54万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Vertical and horizontal profiles of mean currents were measured systematically in vertical cross-sections of two wind-wave tanks with aspect ratio of order one to study the secondary flow and its effect on the primary flow. As is well known, in a wind-wave tank the adverse pressure gradient is balanced by the wind stress on the surface. In the present study, however, we found that the adverse pressure gradient also generated the secondary flow which consisted of a pair of Langmuir vortices. Furthermore, we found that a two-dimensional Poiseuille flow formed in the spanwise direction, that is, the minimum windward current at the center and the maximum current along the side-walls. Instead of the viscosity of water, this two-dimensional Poiseuille flow is derived from the momentum equation by introducing the eddy viscosity associated with the Langmuir vortices, where the eddy viscosity is given by the product of the friction velocity of water at the surface and the span length of the tank. Thus, we propose that the momentum balance equation in a wind-wave tank is extended in such a way that the pressure gradient is balanced by the sum of the wind stress term and the eddy viscosity term associated with the Langmuir vortices.Another interesting finding in the two tanks, which consist of a large tank with an aspect ratio of 1.25 and a small tank with 0.75, is that the lateral mean vertical current profiles were systematically different between them each other. We account for the reason why markedly different vertical profiles are possible in two wind-wave tanks, from the experimental fact that the vertical scale and current strength associated with the Langmuir vortices depend strongly on both the aspect ratio and span length of the tanks.
在两个纵横比为一阶的风浪池中,系统地测量了垂直剖面上平均流的垂向和水平剖面,以研究风浪池中的二次流及其对一次流的影响。众所周知,在风浪池中,逆压梯度由表面上的风应力平衡。然而,在本研究中,我们发现,逆压梯度也产生了二次流,其中包括一对朗缪尔涡。此外,我们还发现,在展向方向上形成了二维Poiffille流,即中心处的迎风流最小,沿沿着的迎风流最大。该二维泊肃叶流不是水的粘度,而是通过引入与朗缪尔涡旋相关的涡动粘度从动量方程推导出来的,其中涡动粘度由表面水的摩擦速度与水的摩擦速度的乘积给出。罐的跨度长度。因此,我们建议在风浪水槽中的动量平衡方程以这样一种方式进行扩展,即压力梯度由风应力项和与朗缪尔涡相关的涡动粘性项之和来平衡。另一个有趣的发现在两个水槽中,由长宽比为1.25的大水槽和长宽比为0.75的小水槽组成,是横向平均垂直电流剖面系统地不同,他们彼此之间。我们占的原因,为什么显着不同的垂直配置文件是可能在两个风浪罐,从实验的事实,即与朗缪尔涡的垂直尺度和电流强度强烈依赖于两个纵横比和跨度长度的坦克。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
水野信二郎・埜口英昭・木村康隆: "風と開水路の流れの相互作用に関する室内実験" 水工学論文集. 41(発表予定). (1997)
Shinjiro Mizuno、Hideaki Noguchi、Yasutaka Kimura:“风与明渠流相互作用的实验室实验”水利工程杂志 41(待发表)。
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- 发表时间:
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- 影响因子:0
- 作者:
- 通讯作者:
S.Mizuno, H.Noguchi, Y.Kimura: "A pair of Langmuir cells in two laboratory tanks(II)" Journal of Oceanography. 54,No.1. 77-100 (1998)
S.Mizuno、H.Noguchi、Y.Kimura:“两个实验室水箱中的一对朗缪尔细胞(II)”海洋学杂志。
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- 发表时间:
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- 影响因子:0
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- 通讯作者:
埜口英昭・水野信二郎他2名: "風洞水槽内の流れの2次循環流の構造について" 水工学論文集. 40. 743-748 (1996)
Hideaki Noguchi、Shinjiro Mizuno 等 2 人:“风洞水箱二次循环流的结构”水利工程学报 40. 743-748 (1996)。
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- 影响因子:0
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MIZUNO Shinjiro其他文献
MIZUNO Shinjiro的其他文献
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{{ truncateString('MIZUNO Shinjiro', 18)}}的其他基金
An experimental study on CL2 mechanism of Langmuir circulation
Langmuir循环CL2机制的实验研究
- 批准号:
15540424 - 财政年份:2003
- 资助金额:
$ 1.54万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
相似海外基金
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- 批准号:
0116921 - 财政年份:2001
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Measurements of the Generation and Evolution of Langmuir Circulations
朗缪尔环流的产生和演化的测量
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Continuing Grant
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增长或变形表面波下的朗缪尔环流
- 批准号:
9696161 - 财政年份:1996
- 资助金额:
$ 1.54万 - 项目类别:
Continuing Grant
Langmuir Circulations Beneath Growing or Deforming Surface Waves
增长或变形表面波下的朗缪尔环流
- 批准号:
9503456 - 财政年份:1995
- 资助金额:
$ 1.54万 - 项目类别:
Continuing Grant
Dynamics of the Ocean Mixed Layer and Langmuir Circulations
海洋混合层和朗缪尔环流的动力学
- 批准号:
7915232 - 财政年份:1979
- 资助金额:
$ 1.54万 - 项目类别:
Continuing grant
Dynamics of the Ocean Mixed Layer and Langmuir Circulations
海洋混合层和朗缪尔环流的动力学
- 批准号:
7704482 - 财政年份:1977
- 资助金额:
$ 1.54万 - 项目类别:
Continuing grant
LANGMUIR CIRCULATIONS AND WIND-DRIVEN DRIFT CURRENTS IN THE OCEANS
海洋中的朗缪尔环流和风驱动的漂流
- 批准号:
7465410 - 财政年份:1974
- 资助金额:
$ 1.54万 - 项目类别:
Langmuir Circulations and Wind-Driven Drift Currents IN the Oceans
海洋中的朗缪尔环流和风驱动的漂流
- 批准号:
7413057 - 财政年份:1974
- 资助金额:
$ 1.54万 - 项目类别:
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