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Wednesday, May 20, 2020 | History

1 edition of Stepped Spillways: Theoretical, Experimental and Numerical Studies found in the catalog.

Stepped Spillways: Theoretical, Experimental and Numerical Studies

by AndrГ© Luiz Andrade SimГµes

  • 303 Want to read
  • 17 Currently reading

Published by INTECH Open Access Publisher .
Written in English


Edition Notes

En.

ContributionsHarry Edmar Schulz, author, Raquel Jahara Lobosco, author, Rodrigo de Melo Porto, author
The Physical Object
Pagination1 online resource
ID Numbers
Open LibraryOL27044447M
ISBN 109533078936
ISBN 109789533078939
OCLC/WorldCa884070573

Numerical studies regarding the influence of entrapped air on the hydraulic performance of gullies are nonexistent. This is due to the lack of a model that simu Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage Measuring void fraction and velocity fields of a stepped spillway for. This study details an experimental investigation of physical air-water flow characteristics down a stepped spillway conducted in two laboratory models with moderate slopes: the first model was a m long stepped chute with a deg slope comprising two interchangeable-height steps (h = m and h = m); the second model was a m.

Theoretical, CFD Simulation and Experimental Study to Predict the Flowrate Across a Square Edge Broad Crested Weir Depending on the End Depth as a Control Section. Laboratory experiments and numerical model of local scour around submerged sharp crested weirs. () Improving energy dissipation on stepped spillways using breakers. Hydraulic Design of Spillways for Dams Identifying needs Dams are critical infrastructure which provide significant benefits to communities in many ways including provision of water supply, flood mitigation, power generation and irrigation. A key component of a dam is the spillway which provides a means of safely passing flood events through.

Experimental and Numerical Studies of Bowl Geometry Impacts on Thermal Efficiency in a Light-Duty Diesel Engine In light- and medium-duty diesel engines, piston bowl shape influences thermal efficiency, either due to changes in wall heat loss or to changes in the heat release rate. Numerical and experimental characterization of the 2D vertical average-velocity plane at the centre-profile and qualitative air entrainment inside a gully for drainage and reverse flow. Computers and Fluids-Elsevier, (10),52


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Stepped Spillways: Theoretical, Experimental and Numerical Studies by AndrГ© Luiz Andrade SimГµes Download PDF EPUB FB2

Stepped Spillways: Theoretical, Experimental and Numerical Studies the concentrations at the pseudo-bottom, so that we suggest the present methodology to. Stepped Spillways: Theoretical, Experimental and Numerical Studies Ohtsu et al. () studied stepped Stepped Spillways: Theoretical with inclined floors, presenting experimental.

Stepped Spillways: Theoretical, Experimental and Numerical Studies Ohtsu et al. () studied stepped spillways wi th inclined floors, presenting experimental results for angles of inclinatio n of the chute between and 55 o For angles between 19 and 55 o it was observed that the profile of the free surface in the region of uniform flow is.

Stepped Spillways: Theoretical, Experimental and Numerical Studies By André Luiz Andrade Simões, Harry Edmar Schulz, Raquel Jahara Lobosco and Rodrigo de Melo Porto Part of the book.

Stepped spillways is a hydraulic and cost effective measure to dissipate energy of large water flows over the spillway of a dam and like other spillway types have its limitations and a measure to.

Energy dissipation down stepped spillways. An expression is derived in this paper for energy loss, and the problems of assessing it from laboratory models are discussed. The use of pools at successively lower levels which may be use for low dams and gabion weirs is also discussed.

Create an AI-powered research feed to stay up to date with new papers like this posted to ArXiv. Study of Aeration in the Water Flow over Stepped Spillway The aeration rates of 35 working conditions in the water flows over stepped spillways are simulated using numerical model.

The simulated results are compared with experimental data by Chanson. It has shown that the simulated results are fairly coincident Stepped Spillways: Theoretical experimental data.

The work with professionals of different fields of knowledge is common in the academic activity. Studies generated in the interface between two or three fields are difficult to classify.

Hydraulic studies are made in support of the construction of a stepped spillway at the Boguchany Hydroelectric Power Plant with a height of m and a step height of m designed for a. In this study, results of the numerical solution are validated with experimental data of Felder et al.

(a, b) [9,10].They used a stepped spillway with ten steps of 52 cm length; the steps dimensions were 20 × 10 cm. Fig. 5 shows the schematic design of that stepped spillway. In this study, the geometry of the stepped spillway was adjusted to improve its hydraulic performance (energy.

JHR publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes and coasts. Undular bores (favre-waves) in open channels - Experimental studies.

Treske. Pages: Hydraulics of skimming flows over stepped channels and spillways. Hubert Chanson. The design of stepped spillways is a multi-objective optimization problem in which the uncertainty of parameters plays a key role in the stepped spillways’ design. A Fuzzy Transformation Method (FTM), as a first attempt, was employed to address the uncertainty through a multi-objective optimization of the stepped spillway.

The proposed methodology comprises two parts. During the design of a stepped spillway it is fundamental to predict the maximum water depth to define wall height. Many experimental and numerical studies have been made on this subject, however the combination of both, in order to enhance aspects related to free-surface characteristics and their numerical prediction, are still uncovered.

Influence of VOF technique, turbulence model and discretization scheme on the numerical simulation of the non-aerated, skimming flow in stepped spillways Experimental stepped spillway facility at the LNEC, used for experimental validation (Matos, Renna, ).

Theoretical and numerical. Due to their economical and structural aspects, ogee-crested spillways can be constructed and operated in a wide variety of situations.

In this study, a three-dimensional physical model ( scale) was planned and constructed to investigate the impact of converging training walls of the ogee spillways with a curve axis on flow characteristics such as the discharge coefficient, free surface. The stepped spillway at the toe of a dam is one of the widely seen energy dissipation structures in hydro-power of the flood is dissipated due to the air-entrainment in skimming flow, together with the generated vortexes on the experimental investigation in the laboratory is not able to capture the vortex structures in the flow.

Although there has been progress in two-phase flows in hydraulic jumps, detailed theoretical and numerical models of the internal flow features have yet to be developed for a wide range of conditions (Bombardelli ).The submerged hydraulic jump downstream of the impingement point of nappe flow is a particular case offering scant studies (Carrillo et al.

To investigate the influence of the morphology of a stepped overflow weir on re-oxygenation efficiency, twelve models were designed with diverse step lengths l, step heights h, number of steps n, total weir heights H and weir slopes θ for a comparative study. The model variables were as follows: weir slope °–°, step height 5–27 cm, step length 10–54 cm, number of steps 5– Numerical methods vary in their behavior, and the many different types of differ-ential equation problems affect the performanceof numerical methods in a variety of ways.

An excellent book for “real world” examples of solving differential equations is that of Shampine, Gladwell, and Thompson [74]. Our ability to describe processes in nature rests on the observation and experimental methods as well as on theoretical basics of various disciplines.

Under such conditions experimental methods draw from various areas of human activities and research, i.e. from physics, biology, chemistry, aerospace research, oceanic research etc. A CFD model complements experimental and theoretical fluid dynamics by providing an alternative cost-effective means of simulating real flows.

Substantive CFD research has been conducted for simulation of flow over a stepped spillway, especially for the flow field upstream of the air entrainment inception, e.g., [36,37,38,39,40,41,42,43,44,45].Physical modelling and scale effects of air-water flows on stepped spillways* Theoretical analysis (and numerical study) is limited considering the large number of relevant equations: i.e., three basic equations per phase plus a phase transfer equa-tion.

Experimental investigations are also difficult but.Following a first edition inLabyrinth and Piano Key Weirs II – PKW collects up-to-date contributions from people with various backgrounds, from engineers and researchers to academics.

Summarizing the last developments on labyrinth oriented weirs, the book constitutes the state-of-the-art in research and application of piano key.