检索结果-南通市图书馆

第九次河流泥沙国际学术大会

作者： Pierre Y.JULIEN Engineering Research Center Colorado State University Fort Collins CO 80523 USA

＜正＞The log law and the log-wake law are widely used in open-channel flows. They nevertheless fail to replicate the velocity dip phenomena. Guo et al. recently proposed a modified log-wake law （MLWL） for pipe flows and zero-pressure-gradient turbulent boundary layers. The MLWL improves the conventional log-wake law by meeting the zero velocity gradient at the edge of boundary layer. This study shows that the MLWL properly describes the velocity distribution in non-uniform open-channel flows. The non-uniformity of the flow is equivalent to a pressure gradient and is reflected in the wake strength of the MLWL.

关键词： Turbulence Velocity profiles open-channel flows Log law Wake law Non-uniform flow

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Modeling flows over Gravel Beds by a Body Force Method

Modeling Flows over Gravel Beds by a Body Force Method

引用

第六届国际流体力学会议

作者： C.Zeng C.W.Li Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China

A Reynolds-averaged Navier-stokes equations（RANS） model using the body force method（BFM） has been developed to simulate open-channel flows over gravel *** momentum equation is modified by introducing the form drag as an extra body force term to represent the gravel-bed *** applying the body force within the roughness layer of the flow over small-scale roughness,it is found that the body force coefficient f rk varies inversely with the roughness length scale k *** method is robust,not sensitive to mesh resolution and is easily extended to deal with large scale roughness.

关键词： open-channel flows RANS modeling turbulent flows gravel beds body force method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Overbank Flow in a Multi-Staged open channel: Zonal and Overall Discharge Studies

引用

Journal of Geoscience and Environment Protection 2023年第3期11卷 293-304页

作者： Prateek Kumar Singh Xiaonan Tang Hamidreza Rahimi Yutong Guan Department of Building Environment and Energy Engineering Hong Kong Polytechnic University Hong Kong China Department of Civil Engineering Xi’an Jiaotong Liverpool University Suzhou China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing China

An improved divided channel method has been proposed by modelling a parameter using the function of depth ratio for a multi-stage compound channel. Experimental data suggest that as the flow depth increases over the second stage floodplain, fractional contribution of the main channel and first stage floodplain under bankfull height plays a pivotal role in shear layer and momentum distribution. Therefore, a new mathematical model has been suggested for estimating the stage-discharge relationship for staged channels of more than one floodplain using the 1D technique of overall roughness correction. .

关键词： Overbank Floodplains River Dynamics Asymmetric channels open-channel flows

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：