Solution of the Unsteady Free Surface Flow in a Storm Drain by the Method of Characteristics PDF Download

Author: Subin Pinkayan
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 160

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Book Description

Author: Vujica M. Yevjevich
Publisher:
ISBN:
Category : Flood routing
Languages : en
Pages : 204

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107

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Book Description

Author: Vujica M. Yevjevich
Publisher:
ISBN:
Category : Flood routing
Languages : en
Pages : 128

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Author: Colorado State University
Publisher:
ISBN:
Category :
Languages : en
Pages : 300

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Author: Colorado State University
Publisher:
ISBN:
Category :
Languages : en
Pages : 35

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Author: Arturo S. León
Publisher:
ISBN: 9780549096306
Category :
Languages : en
Pages : 388

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Book Description
The main aim of this thesis is to advance our understanding of the process of flood-wave propagation through storm-sewer systems by improving the methods available for simulating unsteady flows in closed conduits ranging from free surface flows, to partly free surface-partly pressurized flows (mixed flows), to fully pressurized flows. Two fully-conservative, computationally efficient and robust models are formulated in this thesis. In the first model, pressurized flows are simulated as free surface flows using a hypothetical narrow open-top slot ("Preissmann slot"). In the second model, free surface and pressurized flows are treated independently while interacting through a moving interface. In the first model, a gradual transition between the pipe and the slot is introduced and an explicit Finite Volume (FV) Godunov-type Scheme (GTS) is used to solve the free surface flow governing equations. This model is called the modified Preissmann model. In the second model, both free surface and pressurized flows are handled using shock-capturing methods---specifically GTS schemes. Open channel-pressurized flow interfaces are treated using a shock-tracking-capturing approach. For boundary conditions, an intrinsically conservative second-order accurate formulation is developed. The proposed formulation for boundary conditions maintains the conservation property of FV schemes and does not require any special treatment to handle shocks at boundaries. Comparisons between simulated results and experiments reported in the literature show that the two formulated models can accurately describe complex flow features---such as negative open channel-pressurized flow interfaces, interface reversals, and open-channel surges---that have not been addressed well, or not considered at all, by previous models. Numerical simulations also show that the formulated models are able to produce stable results for strong (rapid) transients at field scale. In general, the scope of this work is limited to single-phase flows (liquids). However, a simplified model for air-water mixture flows, valid only when the amount of gas in the conduit is small, has been implemented in the pressurized flow regime. This work does not include the prediction of any type of air entrainment or air release.

Author: Albert H. Barnes
Publisher:
ISBN:
Category : Runoff
Languages : en
Pages : 302

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Author: Ben Chie Yen
Publisher:
ISBN:
Category : Storm sewers
Languages : en
Pages : 176

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Book Description

Author: John Swaffield
Publisher: Routledge
ISBN: 1136929576
Category : Technology & Engineering
Languages : en
Pages : 307

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Book Description
Climate change will present a series of challenges to engineers concerned with the provision of both building internal appliance drainage networks and rainwater systems within the building boundary, generally identified as the connection to the sewer network. Climate change is now recognised as presenting both water shortage and enhanced rainfall design scenarios. In response to predictions about immanent climate change Transient Free Surface Flows in Building Drainage Systems addresses problems such as the reduction in water available to remove waste from buildings, and conversely, the increase in frequency of tropical-type torrential rain. Starting with introductory chapters that explain the theories and principles of solid transport, free surface flows within drainage networks, and attenuating appliance discharge flows, this book allows readers from a variety of backgrounds to fully engage with this crucial subject matter. Later chapters apply these theories to the design of sanitary and rainwater systems. Case studies highlight the applicability of the method in assessing the appropriateness of design approaches. In this unique book, research in modelling for free surface flows at Edinburgh’s Heriot-Watt University is drawn on to provide a highly authoritative, physics-based study of this complex engineering issue.