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Relevant bibliographies by topics / Undular hydraulic jump

Academic literature on the topic 'Undular hydraulic jump'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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Dissertations / Theses
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Journal articles on the topic "Undular hydraulic jump"

1

Reinauer, Roger, and Willi H. Hager. "Non-breaking undular hydraulic jump." Journal of Hydraulic Research 33, no. 5 (September 1995): 683–98. http://dx.doi.org/10.1080/00221689509498564.

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Ohtsu, Iwao, Youichi Yasuda, and Hiroshi Gotoh. "Non-Breaking Undular Hydraulic Jump." Journal of Hydraulic Research 34, no. 4 (July 1996): 567–73. http://dx.doi.org/10.1080/00221689609498479.

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3

THORPE, S. A., and I. KAVCIC. "The circular internal hydraulic jump." Journal of Fluid Mechanics 610 (August 8, 2008): 99–129. http://dx.doi.org/10.1017/s0022112008002553.

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Circular hydraulic jumps are familiar in single layers. Here we report the discovery of similar jumps in two-layer flows. A thin jet of fluid impinging vertically onto a rigid horizontal plane surface submerged in a deep layer of less-dense miscible fluid spreads radially, and a near-circular internal jump forms within a few centimetres from the point of impact with the plane surface. A jump is similarly formed as a jet of relatively less-dense fluid rises to the surface of a deep layer of fluid, but it appears less stable or permanent in form. Several experiments are made to examine the case of a downward jet onto a horizontal plate, the base of a square or circular container. The inlet Reynolds numbers, Re, of the jet range from 112 to 1790. Initially jumps have an undular, laminar form with typically 2–4 stationary waves on the interface between the dense and less-dense layers but, as the depth of the dense layer beyond the jump increases, the transitions become more abrupt and turbulent, resulting in mixing between the two layers. During the transition to a turbulent regime, single and sometimes moving multiple cusps are observed around the periphery of jumps. A semi-empirical model is devised that relates the parameters of the laboratory experiment, i.e. flow rate, inlet nozzle radius, kinematic viscosity and reduced gravity, to the layer depth beyond the jump and the radius at which an undular jump occurs. The experiments imply that surface tension is not an essential ingredient in the formation of circular hydraulic jumps and demonstrate that stationary jumps can exist in stratified shear flows which can be represented as two discrete layers. No stationary circular undular jumps are found, however, in the case of a downward jet of dense fluid when the overlying, less-dense, fluid is stratified, but a stationary turbulent transition is observed. This has implications for the existence of stationary jumps in continuously stratified geophysical flows: results based on two-layer models may be misleading. It is shown that the Froude number at which a transition of finite width occurs in a radially diverging flow may be less than unity.

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Ohtsu, Iwao, Youichi Yasuda, and Hiroshi Gotoh. "Hydraulic condition for undular-jump formations." Journal of Hydraulic Research 39, no. 2 (April 2001): 203–9. http://dx.doi.org/10.1080/00221680109499821.

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5

Chanson, H. "Hydraulic condition for undular-jump formations." Journal of Hydraulic Research 40, no. 3 (May 2002): 379–84. http://dx.doi.org/10.1080/00221680209499953.

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Rostami, Fatemeh, Saeed Reza Sabbagh Yazdi, Md Azlin Md Said, and Mahdi Shahrokhi. "Numerical simulation of undular jumps on graveled bed using volume of fluid method." Water Science and Technology 66, no. 5 (September 1, 2012): 909–17. http://dx.doi.org/10.2166/wst.2012.213.

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Undular hydraulic jumps are characterized by a smooth rise of the free surface, followed by a train of stationary waves. These jumps sometimes occur in natural waterways and rivers. Numerical difficulties are especially distinct when the flow condition is close to the critical value because of the high sensitivity of the near-critical flow field to flow and channel conditions. Furthermore, the free surface has a wavy shape, which may indicate the occurrence of several transitions from supercritical to subcritical states and vice versa (i.e., undular hydraulic jumps). In this study, a flow model is used to predict an undular hydraulic jump in a rectangular open channel. The model is based on the general two-dimensional, Reynolds-averaged, Navier–Stokes flow equations. The resulting set of partial differential equations is solved using the FLOW-3D solver. The results are compared with the experimental data to validate the model. The comparative analysis shows that the proposed model yields good results. Several types of undular hydraulic jumps occurring in different situations are then simulated to prove the potential application of the model.

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RIABENKO, Alexander A., Volodymyr V. CHERNYUK, Oksana A. KLYUHA, Oksana A. HALYCH, and Dmytro M. POPLAVSKIY. "Mathematical and hydraulic modelling of undular jump." Journal of Civil Engineering, Environment and Architecture XXXII, no. 3/II/2015 (December 1, 2015): 379–91. http://dx.doi.org/10.7862/rb.2015.162.

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8

Castro-Orgaz, Oscar. "Weakly undular hydraulic jump: effects of friction." Journal of Hydraulic Research 48, no. 4 (August 2010): 453–65. http://dx.doi.org/10.1080/00221686.2010.491646.

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Di Nucci, Carmine, and Aniello Russo Spena. "Weakly undular hydraulic jump: effects of friction." Journal of Hydraulic Research 49, no. 3 (June 2011): 409–12. http://dx.doi.org/10.1080/00221686.2011.569217.

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Castro-Orgaz, Oscar, Willi H. Hager, and Subhasish Dey. "Depth-averaged model for undular hydraulic jump." Journal of Hydraulic Research 53, no. 3 (October 24, 2014): 351–63. http://dx.doi.org/10.1080/00221686.2014.967820.

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Dissertations / Theses on the topic "Undular hydraulic jump"

1

THIN, THWE THWE. "FUNDAMENTAL STUDY ON UNDULAR AND DISCONTINUOUS HYDRAULIC JUMPS BY MEANS OF ＡSIMPLIFIED MOMENTUM EQUATION." Kyoto University, 2020. http://hdl.handle.net/2433/259024.

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Connell, R. J. "Unstable equilibrium : modelling waves and turbulence in water flow." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/592.

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This thesis develops a one-dimensional version of a new data driven model of turbulence that uses the KL expansion to provide a spectral solution of the turbulent flow field based on analysis of Particle Image Velocimetry (PIV) turbulent data. The analysis derives a 2nd order random field over the whole flow domain that gives better turbulence properties in areas of non-uniform flow and where flow separates than the present models that are based on the Navier-Stokes Equations. These latter models need assumptions to decrease the number of calculations to enable them to run on present day computers or super-computers. These assumptions reduce the accuracy of these models. The improved flow field is gained at the expense of the model not being generic. Therefore the new data driven model can only be used for the flow situation of the data as the analysis shows that the kernel of the turbulent flow field of undular hydraulic jump could not be related to the surface waves, a key feature of the jump. The kernel developed has two parts, called the outer and inner parts. A comparison shows that the ratio of outer kernel to inner kernel primarily reflects the ratio of turbulent production to turbulent dissipation. The outer part, with a larger correlation length, reflects the larger structures of the flow that contain most of the turbulent energy production. The inner part reflects the smaller structures that contain most turbulent energy dissipation. The new data driven model can use a kernel with changing variance and/or regression coefficient over the domain, necessitating the use of both numerical and analytical methods. The model allows the use of a two-part regression coefficient kernel, the solution being the addition of the result from each part of the kernel. This research highlighted the need to assess the size of the structures calculated by the models based on the Navier-Stokes equations to validate these models. At present most studies use mean velocities and the turbulent fluctuations to validate a models performance. As the new data driven model gives better turbulence properties, it could be used in complicated flow situations, such as a rock groyne to give better assessment of the forces and pressures in the water flow resulting from turbulence fluctuations for the design of such structures. Further development to make the model usable includes; solving the numerical problem associated with the double kernel, reducing the number of modes required, obtaining a solution for the kernel of two-dimensional and three-dimensional flows, including the change in correlation length with time as presently the model gives instant realisations of the flow field and finally including third and fourth order statistics to improve the data driven model velocity field from having Gaussian distribution properties. As the third and fourth order statistics are Reynolds Number dependent this will enable the model to be applied to PIV data from physical scale models. In summary, this new data driven model is complementary to models based on the Navier-Stokes equations by providing better results in complicated design situations. Further research to develop the new model is viewed as an important step forward in the analysis of river control structures such as rock groynes that are prevalent on New Zealand Rivers protecting large cities.

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Book chapters on the topic "Undular hydraulic jump"

1

Steinrück, Herbert. "Multiple Scales Analysis of the Turbulent Undular Hydraulic Jump." In Asymptotic Methods in Fluid Mechanics: Survey and Recent Advances, 197–219. Vienna: Springer Vienna, 2010. http://dx.doi.org/10.1007/978-3-7091-0408-8_6.

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Steinrück, Herbert, and Wilhelm Schneider. "A multiple scales analysis of the undular hydraulic jump in turbulent open channel flow." In Shallow Flows, 305–6. Taylor & Francis, 2004. http://dx.doi.org/10.1201/9780203027325.ch38.

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Conference papers on the topic "Undular hydraulic jump"

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HAGER, WILLI H., and OSCAR CASTRO-ORGAZ. "ON THE UNDULAR HYDRAULIC JUMP AND THE UNDULAR SURGE." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0414.

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TAKEMURA, YOSHIHARU, and SHOJI FUKUOKA. "ANALYSIS OF FLOWS IN UNDULAR AND BREAKING HYDRAULIC JUMPS BY NONHYDROSTATIC QUASI THREE-DIMENSIONAL MODEL CONSIDERING FLOW EQUATIONS ON BOUNDARY SURFACES (Q3D-FEBS)." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0685.

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