mitigation of hydrodynamic resistance methods to reduce hydrodynamic drag

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Mitigation Of Hydrodynamic Resistance

Author : Marc Perlin
ISBN : 9789814612272
Genre : Technology & Engineering
File Size : 63. 61 MB
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This text presents the state of the art in friction drag/resistance reduction technologies for BODIES and crafts operating in liquids at and beneath the free surface. It is useful for professionals with backgrounds in advanced fluid dynamics as well as by academics teaching introductory graduate courses in this area. Active control of resistance will include a discussion of friction reduction, for example through the injection of gas that can form air layers and polymers that initially reside adjacent to the hull, including the use of partial and super cavities. The book discusses passive resistance control achieved through changes in the overall hull shape and appendages, including the application of lifting bodies, bulbous bows, and stern flaps. It also addresses passive reduction of skin friction through the application of hull coatings and other elements of hull husbandry. Contents:IntroductionActive Techniques:Modification of Drag by Polymer InjectionFriction Drag Reduction by Bubble/Gas InjectionTransition from BDR and Air Layer Drag ReductionFriction Drag Reduction by Partial Air Cavities or PCDRPassive Techniques:Drag Reduction by Super and Partial CavitiesSuper-Hydrophobic Surfaces and CoatingsPassive Resistance-Mitigation by Appendages: Bulbous Bows, Stern Flaps and Wedges, and Lifting Bodies Readership: Professionals, academics, researchers, and graduate students in ocean engineering, mechanical engineering, fluid mechanics and tribology. Keywords:Drag Reduction;Air Layers;Air Cavities;Polymer Injection;Bubble/Gas Injection;Hydrophobic Surfaces;Passive Drag Mitigation

Mitigation Of Hydrodynamic Resistance

Author : Marc Perlin
ISBN : 9814612251
Genre : Science
File Size : 72. 35 MB
Format : PDF, ePub, Docs
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This text presents the state of the art in friction drag/resistance reduction technologies for BODIES and crafts operating in liquids at and beneath the free surface. It is useful for professionals with backgrounds in advanced fluid dynamics as well as by academics teaching introductory graduate courses in this area. Active control of resistance will include a discussion of friction reduction, for example through the injection of gas that can form air layers and polymers that initially reside adjacent to the hull, including the use of partial and super cavities. The book discusses passive resistance control achieved through changes in the overall hull shape and appendages, including the application of lifting bodies, bulbous bows, and stern flaps. It also addresses passive reduction of skin friction through the application of hull coatings and other elements of hull husbandry.

Mitigation Of Hydrodynamic Resistance Methods To Reduce Hydrodynamic Drag

Author : Marc|Ceccio Perlin (Steven)
ISBN : OCLC:1027310750
Genre :
File Size : 59. 58 MB
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Maritime Information Review

Author :
ISBN : UVA:35007002751877
Genre : Shipping
File Size : 30. 36 MB
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Handbook Of Coastal Disaster Mitigation For Engineers And Planners

Author : Miguel Esteban
ISBN : 9780128012703
Genre : Technology & Engineering
File Size : 44. 39 MB
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The world’s population is expected to increase to over 8 billion by 2020. About 60% of the total population of the world lives in coastal areas and 65% of the cities with a population of over 2.5 million are located in coastal areas. Written by an international panel of experts in the fields of engineering and risk management, The Handbook of Coastal Disasters Mitigation presents a coherent overview of 10 years of coastal disaster risk management and engineering, during which some of the most relevant events of recent time have taken place, including the Indian Ocean tsunami, hurricanes Katrina and Sandy in the United States or the 2011 Japanese tsunami. International case studies offer practical lessons on how disaster resilience can be improved in the future Contains tools and techniques for analyzing and managing the risk of coastal disasters Provides engineering measures for mitigating coastal vulnerability to tsunamis, tropical cyclones, and hurricanes Includes crucial tactics for rehabilitation and reconstruction of the infrastructure

The Palgrave Handbook Of Unconventional Risk Transfer

Author : Maurizio Pompella
ISBN : 9783319592978
Genre : Business & Economics
File Size : 57. 99 MB
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This handbook examines the latest techniques and strategies that are used to unlock the risk transfer capacity of global financial and capital markets. Taking the financial crisis and global recession into account, it frames and contextualises non-traditional risk transfer tools created over the last 20 years. Featuring contributions from distinguished academics and professionals from around the world, this book covers in detail issues in securitization, financial risk management and innovation, structured finance and derivatives, life and non-life pure risk management, market and financial reinsurance, CAT risk management, crisis management, natural, environmental and man-made risks, terrorism risk, risk modelling, vulnerability and resilience. This handbook will be of interest to academics, researchers and practitioners in the field of risk transfer.

Active And Passive Separation Control For Drag Reduction Of A Maneuvering Hull Form

Author : James Crandall Schulmeister
ISBN : OCLC:986242596
Genre :
File Size : 39. 91 MB
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Boundary layer separation is a source of large fluid dynamic forces on many engineered vehicles and structures, limiting the speed and efficiency at which we transport people and goods. The maneuvering of ocean and air vehicles in particular is limited by resistance due to cross-flow separation. Hull forms with lower hydrodynamic resistance in maneuvers are able to follow trajectories with tighter turns and at higher speeds. Despite the progress that has been made in the control of two dimensional flow separation, little has been done to apply flow control to complex three-dimensional separation from maneuvering hull forms. This thesis studies and develops mechanisms for mitigating three-dimensional cross-flow separation to reduce the drag of hull forms in maneuvers. A new strategy is proposed for designing flow control mechanisms for the three dimensional flow past maneuvering hull forms based on the unsteady cross-flow analogy. The unsteady cross-flow analogy relates the steady flow past a three-dimensional body to an analogous unsteady two-dimensional flow past a cylinder that changes size and shape in time. This provides a framework for adapting two-dimensional drag reduction techniques to the three-dimensional flow. In addition, the unsteady cross-flow analogy is computationally inexpensive and so is suitable for iterative use in preliminary design. The new strategy is considered by first implementing the unsteady cross-flow analogy in numerical simulations. Next, passive and active flow control mechanisms are studied experimentally for drag reduction of a circular cylinder and then adapted through the analogy for drag reduction of a slender body at an angle of attack. Passive control is exerted through modifications to the shape of the body and active control is exerted with rotating control cylinders. Both passive and active methods are experimentally demonstrated to reduce the drag. The experimental results also confirm key predictions of the unsteady cross-flow analogy, demonstrating that it is a promising tool for developing three-dimensional separation control techniques.

Climate Change 2014 Mitigation Of Climate Change

Author : Intergovernmental Panel on Climate Change
ISBN : 9781107058217
Genre : Law
File Size : 82. 90 MB
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This latest Fifth Assessment Report of the IPCC will again form the standard reference for all those concerned with climate change and its consequences.

Marine And Industrial Biofouling

Author : Hans-Curt Flemming
ISBN : 9783540697961
Genre : Science
File Size : 82. 41 MB
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Biofouling is a costly problem, and it is encountered in a wide spectrum of technical systems, ranging from the shipping industry, power industry, water purification, automobile industry, paint and pharmaceuticals, to the microelectronics and food industries. Micro- and macroorganisms attach to surfaces and accumulate there, forming biofilms that cause interferences – a fundamentally natural process. Usually, a medical paradigm is applied: kill biofilms and the problem is solved. This leads to excessive biocide use. However, the success of this strategy is very limited; furthermore it leads to equipment damage and environmental pollution. Simply trying to kill the fouling organisms is clearly not seen as a successful strategy while cleaning is put forward as much more important. In this book, strategies to prevent adhesion, to mitigate the extent and effects of biofouling, and to detect and remove fouling layers are presented. Holistic approaches to the fouling process are elaborated, taking into account options such as nutrient limitation, repellent and easy-to-clean surfaces for fouling layer limitation, and replacing biocides with more environmentally friendly methods – in other words: learning how to live with fouling biofilms without suffering the damage they can do.

Commerce Business Daily

Author :
ISBN : NYPL:33433063171239
Genre : Government purchasing
File Size : 27. 16 MB
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