Hydraulic Analysis Of Unsteady Flow In Pipe Networks

In recent years, as oil and gas fields become less accessible and their hydrocarbon quality lower and more variable, maintaining or increasing production levels has emerged as a key field development goal. One of the most pronounced challenges in meeting this goal is managing the complex hydraulics of pipelines used in gathering systems and transporting the oil and gas from wells to processing facilities. As these pipelines get longer in new fields, deeper in offshore environments, or simply older in aging implementations, E&P companies face critical problems for which they need better performance predicting and troubleshooting tools. This book is a basic guide to deliver the bare-bones of a subject in bite-sized chunks. If you need to get a good understanding of the basics of pipeline hydraulic engineering problems as quickly as possible then this book is for you.

Analysis and Modelling of Non-Steady Flow in Pipe and Channel Networks deals with flows in pipes and channel networks from the standpoints of hydraulics and modelling techniques and methods. These engineering problems occur in the course of the design and construction of hydroenergy plants, water-supply and other systems. In this book, the author presents his experience in solving these problems from the early 1970s to the present day. During this period new methods of solving hydraulic problems have evolved, due to the development of computers and numerical methods. This book is accompanied by a website which hosts the author's software package, Simpip (an abbreviation of simulation of pipe flow) for solving non-steady pipe flow using the finite element method. The program also covers flows in channels. The book presents the numerical core of the SimpipCore program (written in Fortran). Key features: Presents the theory and practice of modelling different flows in hydraulic networks Takes a systematic approach and addresses the topic from the fundamentals Presents numerical solutions based on finite element analysis Accompanied by a website hosting supporting material including the SimpipCore project as a standalone program Analysis and Modelling of Non-Steady Flow in Pipe and Channel Networks is an ideal reference book for engineers, practitioners and graduate students across engineering disciplines.

The first of its kind, this modern, comprehensive text covers both analysis and design of piping systems. The authors begin with a review of basic hydraulic principles, with emphasis on their use in pumped pipelines, manifolds, and the analysis and design of large pipe networks. After the reader obtains an understanding of how these principles are implemented in computer solutions for steady state problems, the focus then turns to unsteady hydraulics. These are covered at three levels:

From municipal water supply to wastewater collection, pressurized pipe networks form the basis of many urban water systems. Numerical models are essential for analyzing their unsteady hydraulics, but there are multiple types of models with poorly understood ranges of applicability. Water hammer models feature greater physical accuracy, making them suitable for highly dynamic conditions. They are, however, more computationally demanding than the simpler yet less accurate rigid water column (RWC) and quasi-steady models. Unsteady hydraulic analyses require solution methods that are both physically accurate and computationally efficient; accordingly, there is an accuracy-efficiency trade-off. To balance these competing demands, this thesis presents an adaptive hybrid transient model (AHTM) capable of simulating the full range one-dimensional unsteady pipe network hydraulics. In developing the comprehensive AHTM, a number of gaps in the literature are addressed. A novel RWC formulation is first proposed, one that overcomes the numerical challenges of previous published work. This is subsequently combined with unsteady flow characterization indices and an adaptive scheme to form an incompressible flow AHTM. Essentially, a more demanding yet more physically accurate model is used only when necessary for efficiency; though powerful, the framework does not consider unsteady-compressible flow. The third objective concerns models for such conditions. A flexible water hammer formulation is introduced that generalizes the method of characteristics and the wave characteristics method, two predominant numerical approaches. Finally, the culmination of this thesis combines each of the aforementioned into a single comprehensive, flexible, and efficient AHTM. The AHTM is shown to adapt to the degree of unsteadiness and, more importantly, individual analyses. Results of this work ultimately benefit practical analyses of unsteady pipe network hydraulics. Not only can simulations be performed more efficiently, but they may encompass multiple transient flow regimes. Moreover, the key advantages of the comprehensive AHTM are its generality and adaptability.