Simulation Of Upwind Maneuvering Of A Sailing Yacht
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Simulation Of Upwind Maneuvering Of A Sailing Yacht
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Author : Daniel Hartrick Harris
language : en
Publisher:
Release Date : 2002
Simulation Of Upwind Maneuvering Of A Sailing Yacht written by Daniel Hartrick Harris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Ocean engineering categories.
Large Eddy Simulation Of Yacht Aerodynamics
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Author : Stefano Nava
language : en
Publisher:
Release Date : 2017
Large Eddy Simulation Of Yacht Aerodynamics written by Stefano Nava and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Sails categories.
Accurate modelling of the flow field around the sails of a yacht is important for the pre-diction of the forces generated by the sails, which is needed to determine the performance of the yacht. A methodology using Large Eddy Simulation is described for modelling upwind and downwind sails. The important aspect of this approach is the ability of the Large Eddy Simuation to resolve the three-dimensional, turbulent, unsteady structures that develop in the boundary layer, in the regions of flow separation, and in the wake, rather than modelling them. The reproduction of two experiments, involving nominally two-dimensional flow, and characterised by leading and trailing edge separation, showed the ability of the model to reproduce flow separation, transition to turbulence, relam-inarisation of the flow, and helped to determine the resolution requirements for LES in time and space. The method has been subsequently been applied to model upwind sailing, by reproducing a wind tunnel experiment that has previously been investigated using other models. The method predicted the experimental data with great accuracy than the computational results obtained by other authors, by reproducing the turbulent structures developing at the leading edge of the sail. Finally, the model has been applied to downwind sailing, by reproducing a wind tunnel experiment. The simulation of un-steady turbulent structures developing in the boundary layer allowed the computation of the leading edge and trailing edge separation, the tip vortices, and the wake. As a result, the model’s prediction of the pressure distribution reproduced the experimental data, improving the accuracy of the computated force on the sails. However, LES resulted particularly sensitive to the mesh resolution, mesh quality and to the time discretiza-tion, introducing errors if the minimum requirements were not met by the computational model. As a result, although the accuracy of the simulation improved in comparison with other computational models, the required spacial resolution was not met and the LES model resulted in a significantly increase of computational cost.
Aero Hydrodynamics And The Performance Of Sailing Yachts
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Author : Fabio Fossati
language : en
Publisher: A&C Black
Release Date : 2009-12-18
Aero Hydrodynamics And The Performance Of Sailing Yachts written by Fabio Fossati and has been published by A&C Black this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-12-18 with Sports & Recreation categories.
A groundbreaking technical analysis of yacht design based on cutting edge research in the field of aero-hydrodynamics.
Twenty First Symposium On Naval Hydrodynamics
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1997-09-11
Twenty First Symposium On Naval Hydrodynamics written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-09-11 with Science categories.
Numerical Modelling Of The Three Dimensional Turbulent Flow Past Upwind Yacht Sails
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Author : Stephen Collie
language : en
Publisher:
Release Date : 2000
Numerical Modelling Of The Three Dimensional Turbulent Flow Past Upwind Yacht Sails written by Stephen Collie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Atmospheric turbulence categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2003
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Dissertations, Academic categories.
The Physics Of Sailing Explained
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Author : Bryon D. Anderson
language : en
Publisher: Adlard Coles Nautical Press
Release Date : 2003
The Physics Of Sailing Explained written by Bryon D. Anderson and has been published by Adlard Coles Nautical Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Physics categories.
What is the best shape for a yacht? How does turbulence affect a yacht's movement through water? Why do some keels have wings? Is it true that some yachts can sail faster upwind than downwind? Authoritative yet accessible, The Physics of Sailing is the perfect book for anyone who wants to enhance their understanding and enjoyment of sailing. It will enable cruisers and racers alike to grasp how sails, keels and hulls work together to keep boats afloat, and will sharpen their skills with a thorough appreciation of why various boat design features are present and why certain tactics work in particular situations. Anderson outlines the science behind sailing in such a way that anyone can understand and benefit from his explanations without having to trudge through a physics textbook or become a naval architect. Concepts are conveyed simply, concisely, and with many examples and illustrations. With the help of this invaluable book, sailors will be better prepared to handle any situation that might arise on the water.
Unsteady Aerodynamics Of Sailing Maneuvers And Kinetic Techniques
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Author : Riley R. Schutt
language : en
Publisher:
Release Date : 2017
Unsteady Aerodynamics Of Sailing Maneuvers And Kinetic Techniques written by Riley R. Schutt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Small sailboat kinetics are significantly affected by bodyweight motions of the sailor. Highly dynamic motions of the boat lead to unsteady aerodynamics around the sail. These unsteady flows are studied using a two-part approach. First, on-the-water tests in a modified Laser sailboat capture the motion of the boat and sail. Subsequently, these characteristic motions are the basis for towing tank experiments exploring fundamental 2D flows around representative sail sections. The “Sail-Flicking”, “S-Turn”, and “Roll-Tacking” kinetic techniques are explored in depth. Each technique is used by racing sailors to improve the performance during specific portions of a race and are most effective in select wind conditions. Sail Flicking consists of repeated small amplitude sail pulses which increase straight-line speed in upwind and cross-wind sailing. In the 2D case, a vortex pair is shed during each individual “flick”. The benefit in driving force is maximized at apparent wind angles near 45°. Sail Flicking effectiveness scales with the non-dimensional parameters reduced frequency and heave-to-chord ratio, making the technique most effective in light wind. The S-Turning technique uses coordinated turns, rolls, and sail adjustments while sailing downwind. It is named after the boat's “S” shaped path through the water. On-the-water tests show a measurable increase in downwind Velocity Made Good, VMG, while laboratory experiments indicate constructive interaction between the sail and vortices shed during each motion period. Sailboats tack back and forth to make progress into the wind. During a Roll-Tack, sailors allow the boat to reach a high heel angle during the turn. An aggressive bodyweight shift then rolls the boat upright, sweeping the sail through the air and increasing driving force. On-the-water tests show that Roll-Tacking in light wind increases windward VMG relative to straight-line sailing and relative to tacks which do not roll the boat. 2D laboratory experiments representing a slice of the sail show the formation of a strong vortex pair associated with a six fold increase in driving force. ...
Unsteady Aerodynamics Of Upwind Sailing And Tacking
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Author : Frederik C. Gerhardt
language : en
Publisher:
Release Date : 2011
Unsteady Aerodynamics Of Upwind Sailing And Tacking written by Frederik C. Gerhardt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Sailboats categories.
Predicting unsteady sailing yacht performance is of significant current interest to racing syndicates and yacht designers alike because it is anticipated that optimising boats for dynamic conditions will lead to large performance gains. Such optimisations are usually carried out with the aid of Dynamic Velocity Prediction Programs (DVPPs). These programs require knowledge about the behaviour of the sails in unsteady flow. To this end Part A of this work looks at the simplified unsteady aerodynamics of a yacht that sails upwind in waves. Unsteady thin aerofoil theory is extended to the case of two interacting aerofoils representing the headsail and mainsail. The developed novel method is analytical in nature and is based on representing the sail bound vorticity distributions and the unsteady vortex wakes by planar vortex sheets. The theory is successfully validated against data from the literature and pressure distributions from wind tunnel tests. An application of the theory to the case of an International America's Cup Class yacht that pitches in waves reveals that the time-varying components of the aerodynamic forces are small and that only very little energy can be extracted from the unsteady flow about the sails and converted into thrust. Part B looks at the aerodynamics of a yacht that tacks. Since today's DVPPs usually suffer from a lack of available data on the behaviour of the sail forces at very low apparent wind angles a series of quasi-steady experiments was carried out. Test results for different tacking scenarios (headsail flogging or backed) are presented in a form that facilitates incorporation into a DVPP. The quasi-steady approach used in the wind tunnel tests does not account for unsteady effects like the aerodynamic inertia due to the 'added mass' of the sails. The added inertia of a sail can, however, be estimated by 'strip theory'. Using expressions from the literature and experimental results it is found that such a strip theory over-estimates the added inertia of a mainsail by about 20%because it neglects the three-dimensional flow around the head and the foot of the sails. Using the DVPP FS Equilibrium the influence of added sail inertia on the tacking behaviour of a yacht is studied and it is found that added sail inertia has a small but noticeable influence on tacking performance.
Mathematical Modelling Education And Sense Making
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Author : Gloria Ann Stillman
language : en
Publisher: Springer Nature
Release Date : 2020-05-14
Mathematical Modelling Education And Sense Making written by Gloria Ann Stillman and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-14 with Education categories.
This volume documents on-going research and theorising in the sub-field of mathematics education devoted to the teaching and learning of mathematical modelling and applications. Mathematical modelling provides a way of conceiving and resolving problems in people’s everyday lives as well as sophisticated new problems for society at large. Mathematical modelling and real world applications are considered as having potential for cultivating sense making in classroom settings. This book focuses on the educational perspective, researching the complexities encountered in effective teaching and learning of real world modelling and applications for sense making is only beginning. All authors of this volume are members of the International Community of Teachers of Mathematical Modelling (ICTMA), the peak research body into researching the teaching and learning of mathematical modelling at all levels of education from the early years to tertiary education as well as in the workplace.