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Dissertation
Numerical Investigation of Flow around an Appended Ship Hull
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Year: 2013 Publisher: Liège Université de Liège (ULiège)

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Objective: The aim of this Master thesis is to numerically determine flow around the ship hull - DTMB 5415. Further analyses have been made on the different combinations of appendages attached to the ship’s hull. As a result influence of the appendages on the wake structure located in the propeller disk as well as the representation of the forces acting on appendages have been derived. &#13;&#13;Content and methods: &#13;&#13; The free surface flow around a model surface ship (DTMB 5415) advancing in calm water under steady conditions is numerically simulated. The geometry of the DTMB 5415 ship hull was provided in .igs file format. The combatant has been recommended by the 1996 International Towing Tank Conference as a benchmark case for CFD computations of ship resistance and propulsion.  The SHIPFLOW code was employed to evaluate the flow field structure around the ship hull, the forces acting on bare hull and appendages. The solver computed the incompressible RANS equations on structured overlapping grids by using a finite volume technique. Turbulence modelling was achieved through the k-ε and k-ω SST or EASM models.  The propeller was approximated as an active disk for which the solution has been given by a simplified hydrodynamic model. For practical reasons, XCHAP module has coupled a body forces method and a RANS-based finite volume solver to take into account the interactions between the hull and the appendages mounted on it: propellers, rudders, shaft lines, bossings, and brackets.  Various configurations are investigated to establish the influence induced by the appendages on the flow filed.  The numerical solutions obtained are compared with available experimental and other numerical data. &#13;&#13;Expected results: &#13;&#13;First step towards getting good experimental results is the potential flow calculation using mesh convergence study. After choosing good mesh, a preliminary potential flow resistance computation for five different speeds is being made. Then using the free surface results gained from the potential flow computation, new viscous flow resistance computations of bare hull DTMB 5415 are being made. The latter are compared with specific speeds for which experimental data already exists. &#13;&#13;Final viscous flow calculations are done for the same hull but with different appendages using experimental speeds. Results show time averaged velocity, pressure, and turbulent quantities. They together will reveal not only the influences exerted by different configurations of the appendages on the wake structure in the propeller disk but also the forces acting on appendages.


Book
Free-surface flow : computational methods
Author:
ISBN: 0128154861 0128154853 9780128154861 9780128154854 Year: 2019 Publisher: Oxford, United Kingdom ; Cambridge, MA : Butterworth-Heinemann, an imprint of Elsevier,


Book
Stability of Free Surface Flows in Capillary Channels with Rectangular Cross-Sections.
Author:
ISBN: 3736986637 9783736986633 9783736996632 Year: 2017 Publisher: Göttingen Cuvillier Verlag


Book
Shallow Water Hydraulics
Authors: ---
ISBN: 3030130738 303013072X Year: 2019 Publisher: Cham : Springer International Publishing : Imprint: Springer,

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This book presents the theory and computation of open channel flows, using detailed analytical, numerical and experimental results. The fundamental equations of open channel flows are derived by means of a rigorous vertical integration of the RANS equations for turbulent flow. In turn, the hydrostatic pressure hypothesis, which forms the core of many shallow water hydraulic models, is scrutinized by analyzing its underlying assumptions. The book’s main focus is on one-dimensional models, including detailed treatments of unsteady and steady flows. The use of modern shock capturing finite difference and finite volume methods is described in detail, and the quality of solutions is carefully assessed on the basis of analytical and experimental results. The book’s unique features include: • Rigorous derivation of the hydrostatic-based shallow water hydraulic models • Detailed treatment of steady open channel flows, including the computation of transcritical flow profiles • General analysis of gate maneuvers as the solution of a Riemann problem • Presents modern shock capturing finite volume methods for the computation of unsteady free surface flows • Introduces readers to movable bed and sediment transport in shallow water models • Includes numerical solutions of shallow water hydraulic models for non-hydrostatic steady and unsteady free surface flows This book is suitable for both undergraduate and graduate level students, given that the theory and numerical methods are progressively introduced starting with the basics. As supporting material, a collection of source codes written in Visual Basic and inserted as macros in Microsoft Excel® is available. The theory is implemented step-by-step in the codes, and the resulting programs are used throughout the book to produce the respective solutions.


Book
The Effect of Hydrology on Soil Erosion
Authors: --- ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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This Special Issue includes manuscripts about soil erosion and degradation processes and the accelerated rates due to hydrological processes and climate change. The new research included in this issue focuses on measurements, modeling, and experiments in field or laboratory conditions developed at different scales (pedon, hillslope, and catchment). This Special Issue received investigations from different parts of the world such as Ethiopia, Morocco, China, Iran, Italy, Portugal, Greece, and Spain, among others. We are happy to see that all papers presented findings characterized as unconventional, provocative, innovative, and methodologically new. We hope that the readers of the journal Water can enjoy and learn about hydrology and soil erosion using the published material, and share the results with the scientific community, policymakers, and stakeholders to continue this amazing adventure, facing plenty of issues and challenges.


Book
The Effect of Hydrology on Soil Erosion
Authors: --- ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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This Special Issue includes manuscripts about soil erosion and degradation processes and the accelerated rates due to hydrological processes and climate change. The new research included in this issue focuses on measurements, modeling, and experiments in field or laboratory conditions developed at different scales (pedon, hillslope, and catchment). This Special Issue received investigations from different parts of the world such as Ethiopia, Morocco, China, Iran, Italy, Portugal, Greece, and Spain, among others. We are happy to see that all papers presented findings characterized as unconventional, provocative, innovative, and methodologically new. We hope that the readers of the journal Water can enjoy and learn about hydrology and soil erosion using the published material, and share the results with the scientific community, policymakers, and stakeholders to continue this amazing adventure, facing plenty of issues and challenges.


Book
The Effect of Hydrology on Soil Erosion
Authors: --- ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

This Special Issue includes manuscripts about soil erosion and degradation processes and the accelerated rates due to hydrological processes and climate change. The new research included in this issue focuses on measurements, modeling, and experiments in field or laboratory conditions developed at different scales (pedon, hillslope, and catchment). This Special Issue received investigations from different parts of the world such as Ethiopia, Morocco, China, Iran, Italy, Portugal, Greece, and Spain, among others. We are happy to see that all papers presented findings characterized as unconventional, provocative, innovative, and methodologically new. We hope that the readers of the journal Water can enjoy and learn about hydrology and soil erosion using the published material, and share the results with the scientific community, policymakers, and stakeholders to continue this amazing adventure, facing plenty of issues and challenges.


Book
Mathematical Modelling of Energy Systems and Fluid Machinery
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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The ongoing digitalization of the energy sector, which will make a large amount of data available, should not be viewed as a passive ICT application for energy technology or a threat to thermodynamics and fluid dynamics, in the light of the competition triggered by data mining and machine learning techniques. These new technologies must be posed on solid bases for the representation of energy systems and fluid machinery. Therefore, mathematical modelling is still relevant and its importance cannot be underestimated. The aim of this Special Issue was to collect contributions about mathematical modelling of energy systems and fluid machinery in order to build and consolidate the base of this knowledge.


Book
Mathematical Modelling of Energy Systems and Fluid Machinery
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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The ongoing digitalization of the energy sector, which will make a large amount of data available, should not be viewed as a passive ICT application for energy technology or a threat to thermodynamics and fluid dynamics, in the light of the competition triggered by data mining and machine learning techniques. These new technologies must be posed on solid bases for the representation of energy systems and fluid machinery. Therefore, mathematical modelling is still relevant and its importance cannot be underestimated. The aim of this Special Issue was to collect contributions about mathematical modelling of energy systems and fluid machinery in order to build and consolidate the base of this knowledge.


Book
Mathematical Modelling of Energy Systems and Fluid Machinery
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The ongoing digitalization of the energy sector, which will make a large amount of data available, should not be viewed as a passive ICT application for energy technology or a threat to thermodynamics and fluid dynamics, in the light of the competition triggered by data mining and machine learning techniques. These new technologies must be posed on solid bases for the representation of energy systems and fluid machinery. Therefore, mathematical modelling is still relevant and its importance cannot be underestimated. The aim of this Special Issue was to collect contributions about mathematical modelling of energy systems and fluid machinery in order to build and consolidate the base of this knowledge.

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