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Subject = Hydrodynamics;
7 items found
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Displaying Results 1  7 of 7 on page 1 of 1
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A nonlinear potential model to predict largeamplitudesmotions: application to a multibody wave energy converter.
(2008)
Gilloteaux, JeanChristophe; Bacelli, Giorgio; Ringwood, John
A nonlinear potential model to predict largeamplitudesmotions: application to a multibody wave energy converter.
(2008)
Gilloteaux, JeanChristophe; Bacelli, Giorgio; Ringwood, John
Abstract:
The paper is dedicated to the study of nonlinear waves acting on three dimensional surfacepiercing structures. A timedomain nonlinear potentialflow model has been developed to predict the largeamplitude motions of devices in a prescribed seaway. While earlier models have been developed for single wave energy devices, this paper addresses multibody devices, with particular application to the WAVEBOB wave energy device.
http://mural.maynoothuniversity.ie/4417/
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Computer aided analysis of flow and pressure in pipe networks
(2000)
Ali, Mohamed ASalam
Computer aided analysis of flow and pressure in pipe networks
(2000)
Ali, Mohamed ASalam
Abstract:
Pipeline systems range from the very simple to very large and quite complex ones. They may be as uncomplicated as a single pipe conveying water from one reservoir to another or they may be as elaborate as an interconnected set of water distribution networks for a major metropolitan area. Individual pipelines may contain several kinds of pumps at one and or at an intermediate point; they may deliver water to or from storage tanks. A system may consist of a number of subnetworks separated by differing energy lines or pressure levels that serve neighbourhoods at different elevation, and some of these may have pressurised tanks so that the pumps need not operate continuously. In order that these transfer systems will adequately fulfil their intended functions, they may require the inclusion of pressure reducing or pressure sustaining valves. These days an understanding of some particular numerical method and the ability to implement them on a computer, for obtaining solutions for a lar...
http://doras.dcu.ie/18301/
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Modelling study of the hydrodynamic expansion of a laser ablation plume of lithium in vacuum
(2003)
Stapleton, Mark
Modelling study of the hydrodynamic expansion of a laser ablation plume of lithium in vacuum
(2003)
Stapleton, Mark
Abstract:
This work is concerned with the study of the important physical processes present in a laser ablation lithium plasma plume expanding into vacuum. A numerical model has been developed encompassing three main areas, namely, hydrodynamics, atomic physics and radiative transfer and spectroscopy. A selfsimilar expansion model has been employed to study the hydrodynamics. A comparison between the isothermal and lsentropic selfsimilar solutions has been performed over a wide range of experimental initial conditions with varying fluence, laser wavelength and target spot size. The effect of these variations is seen, where one of these models predicts experimental observations more accurately, depending on the initial conditions present. Both models have been modified to include the bulk motion of the plasma by considering the pressure exerted by the expanding plume onto the target. The steady state colhsional radiative model was used to calculate the electron, ion and energy level popula...
http://doras.dcu.ie/18229/
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Online process control for centrifugal micromixing
(2005)
Haeberle, S.; Zengerle, Roland; Ducrée, Jens
Online process control for centrifugal micromixing
(2005)
Haeberle, S.; Zengerle, Roland; Ducrée, Jens
Abstract:
This paper describes a novel hydrodynamic principle for online process control of flow rate ratios and mixing between two concurrent flows in our recently introduced centrifugal micromixer (Ducree et al., 2003 and Ducree et al., 2004). These flows are contacted in an asymmetric, planar Ystructure on a rotating disk and subsequently driven through a common radial mixing channel. We show that the ratio of the incoming flow rates is statically seeded by the asymmetry of the inlets. The ratio can dynamically be adjusted by the frequency of rotation to realize a feedback process control. Furthermore, a new mechanism of quasi instantaneous mixing is activated by the sense of rotation. The proposed hydrodynamic mechanism is validated by experiments and simulations.
http://doras.dcu.ie/15473/
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Pressure development due to viscous fluid flow through a converging gap
(2004)
Imhamed, Ahmed
Pressure development due to viscous fluid flow through a converging gap
(2004)
Imhamed, Ahmed
Abstract:
The behaviour of fluid flow in industrial processes is essential for numerous applications and there have been vast amount of work on the hydrodynamic pressure generated due to the flow of viscous fluid. One major manifestation of hydrodynamic pressure application is the wire coating/drawing process, where the wire is pulled through a unit either conical or cylindrical bore filled with a polymer melt that gives rise to the hydrodynamic pressure inside the unit. The hydrodynamic pressure distribution may change during the process due to various factors such as the pulling speed, process temperature, fluid viscosity, and geometrical shape of the unit (die). This work presents the process of designing a new plastohydrodynamic pressure die based on a taperedsteppedparallel bore shape; the device consists of a fixed hollow outer cylinder and an inner rotating shaft, where the hollow cylinder represents a pressure chamber and the rotating shaft represents the moving surface of the wire...
http://doras.dcu.ie/17926/
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Receding horizon pseudospectral optimal control for wave energy conversion
(2016)
Genest, Romain; Ringwood, John
Receding horizon pseudospectral optimal control for wave energy conversion
(2016)
Genest, Romain; Ringwood, John
Abstract:
The present study introduces a realtime control algorithm for applications involving energy maximisation and subject to technological limitations. Development of Wave energy converters constitutes an actual topic of research, in their designs and fluidinteractions, and particularly on their controllability. Immersed WECs are subject to fluidinteraction forces, generating unusual solicitations specific to hydrodynamic equation, such as radiation force or excitation forces. Various control strategies were recently developed and more advance control algorithms are currently applied on WECS, such as Model Predictive Control [1], or Pseudospectral optimal control [2]. Such control strategies, capable of maximizing the energy production while insuring the respect of path constraints, are more realistic and applicable in real conditions involving technological limitation aspects. This paper presents a receding horizon type control, based on pseudospectral approach in the control problem...
http://mural.maynoothuniversity.ie/9414/
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Simulation of fluid flow system in process industries
(2000)
Khamkham, Nasser E
Simulation of fluid flow system in process industries
(2000)
Khamkham, Nasser E
Abstract:
A comprehensive and integrated suite of computer software has been developed to simulate the steady, onedimensional, incompressible fluid flow in pipeline networks. The computer program accommodates Newtonian liquids, but does not generally apply to gas flow unless the assumption of constant density is acceptable. The computer program is written in C language, to solve the basic pipe system equations using the linear theory method. This computer program is written to analyse steady state flows and pressures for pipe distribution system. The program is written to accommodate any piping configuration and various hydraulic components such as pumps, valves or any component, which produces significant head loss. Computations can be carried out using English units of CFS, GPM or Standard International (SI) units. In this project, the linear theory method is employed for solving the set of equations describing the pipe network. In addition, other methods for solving the pipe network ha...
http://doras.dcu.ie/18937/
Displaying Results 1  7 of 7 on page 1 of 1
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Institution
Dublin City University (5)
Maynooth University (2)
Item Type
Book chapter (2)
Other (5)
Peer Review Status
Peerreviewed (2)
Unknown (5)
Year
2016 (1)
2008 (1)
2005 (1)
2004 (1)
2003 (1)
2000 (2)
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