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Open channel flow instabilities: Mod...

Huang, Ziyi.

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Open channel flow instabilities: Modeling the spatial evolution of roll waves.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Open channel flow instabilities: Modeling the spatial evolution of roll waves./
作者:	Huang, Ziyi.
面頁冊數:	213 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Contained By:	Dissertation Abstracts International75-05B(E).
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3609906
ISBN:	9781303693434

Open channel flow instabilities: Modeling the spatial evolution of roll waves.
Huang, Ziyi.

Open channel flow instabilities: Modeling the spatial evolution of roll waves. - 213 p.

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)--University of Southern California, 2013.

This item must not be sold to any third party vendors.

This study is concerned with "roll waves", which are a series of intermittent shock-like waves occurring in turbulent water flows down a wide, rectangular open channel due to the natural instability. Most literature on the subject of roll waves have concentrated on theoretical investigations. Only two of them made efforts on computationally simulating real roll-wave flows, but no validation tests were implemented.

ISBN: 9781303693434Subjects--Topical Terms:

860360
Civil engineering.

Open channel flow instabilities: Modeling the spatial evolution of roll waves.
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245 1 0 $a Open channel flow instabilities: Modeling the spatial evolution of roll waves.
300 $a 213 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Includes supplementary digital materials.
500 $a Adviser: Jiin-Jen Lee.
502 $a Thesis (Ph.D.)--University of Southern California, 2013.
506 $a This item must not be sold to any third party vendors.
520 $a This study is concerned with "roll waves", which are a series of intermittent shock-like waves occurring in turbulent water flows down a wide, rectangular open channel due to the natural instability. Most literature on the subject of roll waves have concentrated on theoretical investigations. Only two of them made efforts on computationally simulating real roll-wave flows, but no validation tests were implemented.
520 $a A computational model capable of simulating the spatial evolution of roll waves is constructed in the present work. The equations of motion are the one-dimensional viscous Saint Venant equations, incorporating the turbulently viscous force to describe the momentum diffusion resulting from tremendous gradient and curvature of roll waves. The equations are solved by a high-resolution, shock-capturing numerical scheme. The scheme is based on the conservative finite volume formulation and adopts the second-order TVD Lax-Wendroff Riemann solver. The computational model, written in FORTRAN 95, is named as " Shallow Water Analyzed by a TVD Scheme at University of Southern California'' with an acronym "USC SWAT''. It can be applied to analyze a wide range of shallow water flows.
520 $a The numerical scheme is tested through comparisons with both transient linear and quasi-steady nonlinear theories. The numerical solutions of maximum amplitude of progressing roll waves match the linear theory at time levels in which the wave amplitude is small. The numerical solution of converged progressing roll waves match a mathematical solution of roll waves deduced from the governing equations in a progressing coordinate.
520 $a The constructed computational model is utilized to simulate real roll-wave flows in a constant-slope channel. In the validation test, the spatial development curves of time-averaged wave crest and trough depths achieved from the simulation are compared with those from experimental data. It is shown that the value of the turbulent viscosity needs to be appropriately selected so as to agree with the experimental data. The comparison results manifest the simulation satisfactorily predicts the spatial evolution of wave crest and trough depths.
520 $a Some of important roll-wave properties are investigated. The simulation discovers three types of wave-wave interactions, which impact characteristics of the roll-wave evolution. The spatial evolution of roll waves obeys a generality despite different hydraulic conditions. The nonperiodicity of roll waves increases from upstream to downstream channel locations.
520 $a The extent of the flow instability is weakened in channels with rough bottom. A concept of the breaking-slope open channel is tested through a computational experiment. This concept is found to be useful in suppressing growth of the roll-wave amplitude.
520 $a This computational study covering the comparison with experimental data enriches the knowledge of computational mechanics regarding free-surface water flows, and provides a complete insight on simulating the spatial evolution of roll waves using the Saint Venant equations. Findings from the computational experiments on mitigating the roll-wave evolution could help overcome difficulties caused by open channel flow instabilities.
590 $a School code: 0208.
650 4 $a Civil engineering. $3 860360
650 4 $a Water resources management. $3 794747
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690 $a 0595
710 2 $a University of Southern California. $b Civil Engineering(Water Resources). $3 3174929
773 0 $t Dissertation Abstracts International $g 75-05B(E).
790 $a 0208
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3609906