检索结果-南通市图书馆

SIMULATION OF The ATOMIZED FLOW BY SLIT TYPE BUCKET ENERGY DISSIPATOR

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第6期17卷 758-763页

作者： liu shi-he DUAN Hong-dong School of Water Resource and Hydropower Wuhan University Wuhan 430072 China Water Resources and Hydropower Planning and Design general Institute MWR Beijing 100011 China

Slit type bucket is one kind of flip bucket for energy dissipation generally used in the hydraulic project. In this paper the atomized flow produced behind this energy dis sipator is analyzed, a numerical model for the aerated jet con sidering air entrainment and air resistance force is suggested, and simulation of the rain resulted by the atomized flow is also discussed. Furthermore, the prototype observation data for the atomized flow of Dongjiang Hydropower Station is used to verify the model suggested.

关键词： two phase flow atomized flow slit type energy dissipator

SIMULATION OF LOW-CONCENTRATION SEDIMENT-LADEN FLOW BASED ON TWO-PHASE FLOW TheORY

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第5期19卷 653-660页

作者： liu shi-he ZHAO shi-lai LUO Qiu-shi School of Water Resource and Hydropower Wuhan University Wuhan 430072 China

Low concentration sediment-laden flow is usually involved in water conservancy, environmental protection, navigation and so on. In this article, a mathematical model for low-concentration sediment-laden flow was suggested based on the two-phase flow theory, and a solving scheme for the mathematical model in curvilinear grids was worked out. The observed data in the Zhang River in China was used for the ver/fication of the model, and the calculated results of the water level, velocity and river bed deformation are in agreement with the observed ones.

关键词： two-phase flow sediment-laden flow,numerical simulation

HYBRID SIMULATION OF The HYDRAULIC CHARACTERISTICS AT RIVER AND LAKE CONFLUENCE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2011年第1期23卷 105-113页

作者： liu shi-he CAO Bing College of Water Resource and Hydropower Wuhan University Wuhan 430072 China

The hydraulic characteristics at the confluence reach of river and lake are influenced by multiple factors such as inflow,topography and vegetation resistance,and are very *** this article,the confluence reach of Yangtze River and Dong-ting Lake is selected as a special example and a hybrid model is built to study the flow at this confluence,with the consideration of the interactions between aquatic vegetation and *** tests and calculations show that the model is effective and highly *** simulations show that the separation levee at the confluence reach may change the discharge capacity in the flood plain,which would be enhanced in the upper reach of the levee,hardly changed in the middle reach and reduced at the lower ***,the separation levee also limits the water exchange between the Yangtze River and Dong-ting Lake.

关键词： confluence reach hybrid model separation levee discharge capacity in flood plain

NUMERICAL SIMULATION OF ATOMIZATION RAINFALL AND The GENERATED FLOW ON A SLOPE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2012年第2期24卷 273-279页

作者： liu shi-he TAI Wei FAN Min LUO Qiu-shi State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China Yellow River Engineering Consulting Co. Ltd Zhengzhou 450003 China

This article studies the atomization rainfall and the generated flow on a slope by numerical *** atomization rainfall is simulated by a unified model for splash droplets and a suspended mist,and the distribution of the diameter of splash rain drops is *** slope runoff generated by the atomization rainfall is simulated by a depth-averaged 2-D model,and the localization of the rainfall intensity in space is specially *** simulation results show that：（1） the median rain size of the atomization rainfall increases in the longitudinal direction at first,then monotonously decreases,and the maximum value is taken at the longitudinal position not in consistent with the position where the maximum rain intensity is *** the lateral direction the median rain size monotonously decreases,（2） since the atomization rainfall is distributed in a strongly localized area,it takes a longer time for its runoff yield to reach a steady state than that in the natural rainfall,the variation ranges of the water depth and the velocity in the longitudinal and lateral directions are larger than those in the natural rainfall.

关键词： atomized flow unified model slope runoff numerical simulation

SIMULATION OF SEDIMENT-LADEN FLOW BY DEPTH-AVERAGED MODEL BASED ON UNSTRUCTURED COLLOCATED GRID

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第4期19卷 525-532页

作者： liu shi-he LUO Qiu-shi MEI Jun-ya School of Water Resource and Hydropower Wuhan University Wuhan 430072 China

The 2-D depth-averaged mathematical model for sediment-laden flows has been widely used in river control and other related engineering problems, and now it is usually solved on structured grids. Since the natural river is usually very complicated in plane boundary, and unstructured grids are more attractive in solving the problems with complicated domains, the following questions about solving 2-D depth-averaged model were discussed in this article：（1） a modified Bowyer algorithm was suggested to generate unstructured grids for natural rivers, （2） the Finite Volume Method （FVM） is employed to discretize the governing equations of the 2-D depth-averaged model and an implicit scheme was suggested with unstructured collocated grids, （3） the observed hydrological data of the Chenglingji Reach in the Yangtze River are used for verification of the presented method It seems that the suggested numerical scheme works very well, and the simulation results of both hydraulic characteristics and river bed deformation are in good agreement with the observed ones.

关键词： Bowyer algorithm unstructured grid SIMPLE algorithm

A novel incompressible finite-difference lattice Boltzmann equation for particle-laden flow

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2005年第6期21卷 574-581页

作者： Sheng Chen Zhaohui liu Baochang shi Zhu he Chuguang Zheng State Key Laboratory of Coal Combustion Hua Zhong University of Science and Technology Wuhan 430074 China

In this paper, we propose a novel incompressible finite-difference lattice Boltzmann Equation （FDLBE）. Because source terms that reflect the interaction between phases can be accurately described, the new model is suitable for simulating two-way coupling incompressible multiphase flow The 2-D particle-laden flow over a backward-facing step is chosen as a test case to validate the present method. Favorable results are obtained and the present scheme is shown to have good prospects in practical applications.

关键词： Finite difference lattice Boltzmann equation Two-way coupling Multiphase flow Incompressible

UNIFIED MODEL FOR SPLASH DROPLETS AND SUSPENDED MIST OF ATOMIZED FLOW

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第1期20卷 125-130页

作者： liu shi-he SUN Xiao-fei LUO Jing State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China

In this article, the unified mathematical model for splash droplets and suspended mist of atomized flow was established, which classifies the atomized sources into the splash source and the suspended source. For the splash source, the Lagrangian method was used to simulate the random motion of splash water droplets, and for the suspended source the theory of air-water two-phase flow was used to simulate the mist flow moving in particle clouds. The rainfall intensity of the atomized flow was obtained by summarizing the rainfall intensities relative to the above two types of atomized sources. Both experimental data and prototype observation data were used for the verification of the mathematical model. For both the distribution of rainfall intensity, and the outer edge of the atomized flow, the simulation results are in agreement with the experimental data or prototype observation data.

关键词： two phase flow atomized flow splash water drop suspended mist

TURBULENT FLOWS AROUND SAND DUNES IN ALLUVIAL RIVERS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第1期22卷 103-109页

作者： liu shi-he YIN Shu-ran GUO Wei College of Water Resource and Hydropower Wuhan University Wuhan 430072 China Yangtze River Scientific Research Institute Wuhan 430010 China

The sand dunes are typical bed forms of natural alluvial rivers. In this article, a vertical 2-D Reynolds stress model is established for the simulation of turbulent flows around sand dunes, and water-sand boundary conditions are set with particular attention. By numerical simulations, the following conclusions can be drawn. （1） The flow resistance in rivers with sand dunes could be divided into the sand-grain resistance and the sand dune resistance, and the sand-grain resistance coefficient mainly depends on Reynolds number, relative sand grain roughness and sand dune steepness. This coefficient in rivers with sand dunes would be larger than that calculated in a flat riverbed, and the steeper the sand dunes, the larger the sand-grain resistance coefficient. （2） The sand dune resistance coefficient mainly depends on the relative sand dune height and sand dune steepness, the steeper the sand dunes, the larger the sand dune resistance coefficient. （3） For the flat riverbed, the turbulent eddy viscosity coefficient and the sediment diffusion coefficient are approximately identical, but for the sand dune riverbed, in the vertical position, where the sediment diffusion coefficient reaches its maximum, it would be higher than the turbulent eddy viscosity coefficient.

关键词： sand dune flow resistance sediment diffusion coefficient eddy viscosity

The calculation of mechanical energy loss for incompressible steady pipe flow of homogeneous fluid

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2013年第6期25卷 912-918页

作者：刘士和薛娇范敏 State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

The calculation of the mechanical energy loss is one of the fundamental problems in the field of Hydraulics and Engineering Fluid Mechanics. However, for a non-uniform flow the relation between the mechanical energy loss in a volume of fluid and the kinematical and dynamical characteristics of the flow field is not clearly established. In this paper a new mechanical energy equation for the incompressible steady non-uniform pipe flow of homogeneous fluid is derived, which includes the variation of the mean turbulent kinetic energy, and the formula for the calculation of the mechanical energy transformation loss for the non-uniform flow between two cross sections is obtained based on this equation. This formula can be simplified to the Darcy-Weisbach formula for the uniform flow as widely used in Hydraulics. Furthermore, the contributions of the mechanical energy loss relative to the time averaged velocity gradient and the dissipation of the turbulent kinetic energy in the turbulent uniform pipe flow are discussed, and the contributions of the mechanical energy loss in the viscous sublayer, the buffer layer and the region above the buffer layer for the turbulent uniform flow are also analyzed.

关键词： mechanical energy loss energy equation pipe flow