Download or read book Water Waves Generated by a Slowly Moving Two Dimensional Body Part 2 written by and published by . This book was released on 1982 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solution is obtained, valid asymptotically as speed approaches zero, for the waves generated behind a two-dimensional surface-piercing body moving ahead at constant speed U. The method of matched asymptotic expansions is used. There are two regions of interest: (i) In a thin surface layer behind the body but not contiguous to it, the generalized WKB method is used to determine the wave motion, except for a constant multiplicative factor. (ii) In a region behind the body and close to it, an integral equation is formulated and solved. This near-field solution can be determined completely from the condition that there must be a stagnation point at the intersection of the free surface and the body surface. Matching to the far-field solution then determines the unknown factor in the far-field solution. No radiation condition is available, since the thin surface layer of waves behind the body is completely isolated from any possible corresponding layer upstream. An asymptotic formula for wave resistance is found, in which the resistance is proportional to C10U48, where C is the body curvature at the intersection of the body and the undisturbed free surface. If C = 0, the power of U in the resistance formula is higher than 48; its value depends on what is the lowest non-zero derivative of body shape at the intersection. It is speculated that, for an analytically vertical body surface in some neighborhood of the intersection, the wave resistance is proportional to exp ( -1/U) as U approaches zero. (Author).
Download or read book Water Waves Generated by a Slowly Moving Two Dimensional Body written by Si-Xiong Chen and published by . This book was released on 1982 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solution is obtained, valid asymptotically as speed approaches zero, for the waves generated behind a two-dimensional surface-piercing body moving ahead at constant speed U. The method of matched asymptotic expansions is used. There are two regions of interest: (i) In a thin surface layer behind the body but not contiguous to it, the generalized WKB method is used to determine the wave motion, except for a constant multiplicative factor. (ii) In a region behind the body and close to it, an integral equation is formulated and solved. This near-field solution can be determined completely from the condition that there must be a stagnation point at the intersection of the free surface and the body surface. Matching to the far-field solution then determines the unknown factor in the far-field solution. No radiation condition is available, since the thin surface layer of waves behind the body is completely isolated from any possible corresponding layer upstream. An asymptotic formula for wave resistance is found, in which the resistance is proportional to C10U48, where C is the body curvature at the intersection of the body and the undisturbed free surface. If C = 0, the power of U in the resistance formula is higher than 48; its value depends on what is the lowest non-zero derivative of body shape at the intersection. It is speculated that, for an analytically vertical body surface in some neighborhood of the intersection, the wave resistance is proportional to exp ( -1/U) as U approaches zero. (Author).
Download or read book Water Waves Generated by a Slowly Moving Two Dimensional Body written by T. Francis Ogilvie and published by . This book was released on 1982 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-speed motion of a ship leads to a singular perturbation problem as speed approaches zero, since waves occur only in a boundary layers of vanishing thickness at the free surface. The complete solution consists of the singular expansion superposed on a regular expansion. The latter (the naive expansion) by itself satisfies all conditions in the lower half-space below the undisturbed free surface, but it does not represent the boundary layer. For the case of a two-dimensional surface-piercing body, it is shown that the regular perturbation series fails to satisfy the body boundary condition in a small wetted region just above the level of the undisturbed free surface. This fact leads to a nonhomogeneous body boundary condition that must be satisfied by the singular expansion. Without such a condition, the singular part of the solution (which represents the real wave motion) would satisfy purely homogeneous conditions and thus would be indeterminate. (Author).
Download or read book Water Waves Generated by a Slowly Moving Two dimensional Body written by Si-Xiong Chen and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Advanced Materials and Structural Engineering written by Jong Wan Hu and published by CRC Press. This book was released on 2016-02-03 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ICAMEST 2015 Conference covered new developments in advanced materials and engineering structural technology. Applications in civil, mechanical, industrial and material science are covered in this book. Providing high-quality, scholarly research, addressing developments, applications and implications in the field of structural health monitoring, construction safety and management, sensors and measurements. This volume contains new models for nonlinear structural analysis and applications of modeling identification. Furthermore, advanced chemical materials are discussed with applications in mechanical and civil engineering and for the maintenance of new materials. In addition, a new system of pressure regulating and water conveyance based on small and middle hydropower stations is discussed. An experimental investigation of the ultimate strength and behavior of the three types of steel tubular K-joints was presented. Furthermore, real-time and frequency linear and nonlinear modeling performance of materials of structures contents were concluded with the notion of a fully brittle material, and this approach is implemented in the book by outlining a finite-element method for the prediction of the construction performance and cracking patterns of arbitrary structural concrete forms. This book is an ideal reference for practicing engineers in material, mechanical and civil engineering and consultants (design, construction, maintenance), and can also be used as a reference for students in mechanical and civil engineering courses.
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Download or read book Proceedings written by and published by . This book was released on 2002 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Interference Problems on Wing fuselage Combinations in Inviscid Incompressible Flow written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1974 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
