Wave type flow at abrupt drops

Kawagoshi, N.; Hager, W.H.

doi:10.1080/00221689009499088

Cited by 39 publications

(8 citation statements)

References 4 publications

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“…Studies on B-jumps were presented by Hager (1988), and Kawagoshi and Hager (1990) . Plunging flow features were analysed by Sene , et al .…”

Section: Preentrained Jumpmentioning

confidence: 99%

“…B-jumps for approaching bottom slopes 0 = 30 0 , and 0 = 45 0 were investigated by Kawagoshi and Hager (1990), and Hager (1988), respectively .…”

Section: B-jumpmentioning

confidence: 99%

“…Hydraul ic jumps at negative steps rece ived somewhat more attent ion and were analysed by , and his discussers, Rouse , et al(1951) , Ingram, et al(1956), Moore and Morgan (1959) , Spiekermann (1962), Haszpra (1965) , Sharp (1974), Binnie (1975) , Rajaratnam and Ort iz (1977) , Bianchi (1981) , Jagannadha Rao and Srinivasa Rao (1982), , Hager and Bretz (1986), Samad, et al (1986), Ming (1988 , De Marinis (1988) , Matsushita (1988), Kawagoshi and Hager (1990) , and Hager and Kawagoshi (1991) . Peruginelli and Viti (1990) analysed the flow features in a trapezoidal channel for 1 .85~Fl~5 .…”

Section: 3 Dynamic Pressuresmentioning

confidence: 99%

“…This is called hereafter wave type flow . A thorough analysis of the maximum wave type flow was presented by Kawagoshi and Hager (1990).…”

Section: )mentioning

confidence: 99%

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Energy Dissipators and Hydraulic Jump

Hager

1992

Water Science and Technology Library

266

162

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I X 229 229 233 References Pa r t 2 No ta ti o n Pa rt 2 Subjec t Ind ex Aut ho r I n d ex 23 9 2 67 271 2 81 PREFACE Stilling basins utili z ing a hydraulic jump for energy dissipation are wi d e l y used in hydraulic engineering . Da Vinci was the first to describe the hydraulic jump, and Bidone conducted classical experiments about 170 years ago . Stilling basins we r e developed in the thirties with significant design improvements being made during the last sixty years . Although we l l -a c c e p t e d guidelines for a successful design are presently available, the information for the design of such dissipators is not yet compiled in book form .This book provides state-of-the-art information on hydraulic jumps and associat ed stilling basins . A large numbe r of papers on the to pics are reviewed. Th e present trends of the art of designing a stilli ng basin are discussed and ideas for future research are outlined. Design criteria and recommendat ions are frequently given . However, this should not be considered as a r eady-to -use guideline since the design of an effective stilling basin is much more comple x than following general design steps .The book is divided into two parts. Part 1 on hydraulic jumps is comprised of chapters 2 to 5. Part 2 consisting of chapters 6 to 14 deals with various hydraulic structures used to dissipate energy. The lists of notation and references are provided in each part separately although the same notation is u sed throughout. I wo u l d like to acknowledge the contributions of various persons: Professor D. Vischer, Director of VAW , encouraged me to prepar e this book and provid ed necessary facilities for this purpose . Dr . K . S c h r a m assisted me greatly in the preparation of the manuscript and Prof . M.H. Chaud hry reviewed it during his sabbatical leave at VAW . During my stay at the EPF L in Lausanne 1983-1988, I was involved wi t h the investigation of stilling basins . The assistance of Prof. R . Sinniger and the collaboration with my former PhD stud ents Dr . N.V. Bretz and Dr . R. Bremen are acknowledged . Discussions with Profs. R. Wanoschek, N. Rajaratnam and J.A. McCorquodale generated my interest in energy dissipation .

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“…Studies on B-jumps were presented by Hager (1988), and Kawagoshi and Hager (1990) . Plunging flow features were analysed by Sene , et al .…”

Section: Preentrained Jumpmentioning

confidence: 99%

“…B-jumps for approaching bottom slopes 0 = 30 0 , and 0 = 45 0 were investigated by Kawagoshi and Hager (1990), and Hager (1988), respectively .…”

Section: B-jumpmentioning

confidence: 99%

Section: 3 Dynamic Pressuresmentioning

confidence: 99%

“…This is called hereafter wave type flow . A thorough analysis of the maximum wave type flow was presented by Kawagoshi and Hager (1990).…”

Section: )mentioning

confidence: 99%

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Energy Dissipators and Hydraulic Jump

Hager

1992

Water Science and Technology Library

266

162

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“…For the traditional dropshaft, standing waves can only occur in a supercritical approach flow [47][48][49] channel due to sidewall deflection or curvature; therefore, the height of sidewalls must be carefully designed in a prototype environment. In addition, these standing waves can spread to downstream channels, causing fluctuations in the water surface.…”

Section: Water Depthmentioning

confidence: 99%

Three-Dimensional Turbulence Numerical Simulation of Flow in a Stepped Dropshaft

Yongfei

Wang

Zhang

2018

Water

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The dropshaft structure is usually applied in an urban drainage system to connect the shallow pipe network and the deep tunnel. By using the renormalization group (RNG) k~ε turbulence model with a volume of fluid method, the flow pattern and the maximum relative water depth over a stepped dropshaft with a different central angle of step were numerically investigated. The calculated results suggested that the flow in the stepped dropshaft was highly turbulent and characterized by deflection during the jet caused by the curvature of the sidewall. According to the pressure distribution on the horizontal step and the flow pattern above the step, the flow field was partitioned into the recirculating region, the wall-impinging region and the mixing region. In addition, with the increase in the central angle of step, the scope of the wall-impinging region and the mixing region increased and the scope of the recirculating region remained nearly unchanged. The maximum water depth increased with the increase in discharge. In the present work we have shown that, as the value of the central angle of step increased, the maximum water depth decreased initially and increased subsequently.

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