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Artykuły w czasopismach na temat "Transom-stern"

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Kamal, I. Z. Mustaffa, A. Imran Ismail, M. Naim Abdullah, and Y. Adnan Ahmed. "Influence of the transom immersion to ship resistance components at low and medium speeds." Journal of Naval Architecture and Marine Engineering 17, no. 2 (December 30, 2020): 165–82. http://dx.doi.org/10.3329/jname.v17i2.48494.

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The transom stern offered some advantages over the traditional rounded cruiser stern reducing the resistance of a ship. This can only be achieved if the transom stern is carefully designed with suitable transom immersion ratio. In this study, the influence of different transom area immersion ratios on the resistance components was investigated for a semi-displacement hull and a full displacement hull. The base hull was based on NPL hull form and KCS hull form for a semi-displacement and full-displacement hull respectively. The transom immersion ratios for the NPL hull were varied at a ratio of
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KIHARA, Hajime. "243 Transom-Stern Free-Surface Flows." Proceedings of the JSME annual meeting 2005.2 (2005): 169–70. http://dx.doi.org/10.1299/jsmemecjo.2005.2.0_169.

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Haase, M., J. Binns, G. Thomas, and N. Bose. "Wave-piercing catamaran transom stern ventilation process." Ship Technology Research 63, no. 2 (April 21, 2016): 71–80. http://dx.doi.org/10.1080/09377255.2015.1119922.

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Maki, Kevin J., Lawrence J. Doctors, Robert F. Beck, and Armin W. Troesch. "Transom-stern flow for high-speed craft." Australian Journal of Mechanical Engineering 3, no. 2 (January 2006): 191–99. http://dx.doi.org/10.1080/14484846.2006.11464508.

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Maki, Kevin J., Armin W. Troesch, and Robert F. Beck. "Experiments of Two-Dimensional Transom Stern Flow." Journal of Ship Research 52, no. 04 (December 1, 2008): 291–300. http://dx.doi.org/10.5957/jsr.2008.52.4.291.

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Measurements of the free-surface behind a backward facing step are made using laser-induced fluorescence and a digital video camera. Tests are conducted for two Reynolds numbers and a range of Froude numbers. An edge detection algorithm is used to locate the free surface from the digital images, and the ensemble of images are used to calculate the mean and root mean square of the elevation. The results of amplitude, length, and steepness are determined from the mean profiles and compared to existing potential flow theories. It is found that the potential flow theories overpredict the real-flui
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Mola, Andrea, Luca Heltai, and Antonio DeSimone. "Wet and Dry Transom Stern Treatment for Unsteady and Nonlinear Potential Flow Model for Naval Hydrodynamics Simulations." Journal of Ship Research 61, no. 01 (March 1, 2017): 1–14. http://dx.doi.org/10.5957/jsr.2017.61.1.1.

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We present a model for the fast evaluation of the total drag of ship hulls operating in both wet and dry transom stern conditions, in calm or wavy water, based on the combination of an unsteady semi-Lagrangian potential flow formulation with fully nonlinear free-surface treatment, experimental correlations, and simplified viscous drag modeling. The implementation is entirely based on open source libraries. The spatial discretization is solved using a streamline upwind Petrov-Galerkin stabilization of an iso-parametric, collocation based, boundary element method, implemented using the open sour
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Bai, K. J., J. H. Kyoung, and J. W. Kim. "Numerical Computations for a Nonlinear Free Surface Problem in Shallow Water." Journal of Offshore Mechanics and Arctic Engineering 125, no. 1 (February 1, 2003): 33–40. http://dx.doi.org/10.1115/1.1537723.

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A finite-element method is developed to simulate a numerical towing tank, in the scope of potential theory. The exact nonlinear free-surface flow problem formulated in an initial/boundary value problem is replaced by an equivalent weak formulation and then discretized by the finite-element method. Emphasis is made on the present simulation to include the dry bottom occurring at the downstream of a transom stern model stretched from the free surface to the tank bottom in supercritical speeds. The dry bottom has been observed in an earlier study of Bai et al. But it was not clear whether the phe
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Nakos, D. E., and P. D. Sclavounos. "Kelvin Wakes and Wave Resistance of Cruiser-and Transom-Stern Ships." Journal of Ship Research 38, no. 01 (March 1, 1994): 9–29. http://dx.doi.org/10.5957/jsr.1994.38.1.9.

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The steady wave patterns, Kelvin-wake spectra and wave resistance of several realistic ship hulls are computed by a Rankine panel method. Wall-sided as well as transom-stern ships are studied over a broad range of Froude numbers and the importance of enforcing a Kutta-type condition of smooth flow detachment at the transom stern is demonstrated. The lack of numerical damping in the solution scheme permits the reliable prediction of the Kelvin wake far from the ship and allows its use in the evaluation of the free wave spectrum. The wave resistance is evaluated by pressure integration as well a
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Wyatt, Donald C. "Development and Assessment of a Nonlinear Wave Prediction Methodology for Surface Vessels." Journal of Ship Research 44, no. 02 (June 1, 2000): 96–107. http://dx.doi.org/10.5957/jsr.2000.44.2.96.

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A numerical method for the prediction of steady nonlinear ship waves and their dependence on hull geometry is developed and assessed. The method employs desingularized Rankine singularities and Havelock singularities in an iterative boundary-integral solution procedure. The Fortran code incorporating this methodology, Das Boot, is tested on three validation cases and applied to a surface combatant hull form. Nonlinear wave elevation predictions for the case of a moving pressure pulse show a 0.988 correlation with a validated fifth-order spectral prediction. Nonlinear wave elevation predictions
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Elangovan, Muniyandy, Hidetsugu Iwashita, Saito Hiroyuki, and Ito Akio. "Seakeeping Estimations of Fast Ships with Transom Stern." Journal of the Japan Society of Naval Architects and Ocean Engineers 7 (2008): 195–206. http://dx.doi.org/10.2534/jjasnaoe.7.195.

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Rozprawy doktorskie na temat "Transom-stern"

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Robards, Simon William Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "The hydrodynamics of high-speed transom-stern vessels." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2008. http://handle.unsw.edu.au/1959.4/42782.

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In the design of all marine craft the prediction of a vessel??s resistance characteristics is a major consideration. The accurate prediction of resistance is particularly important in the design of modern high-speed vessels where the primary contractual obligation placed upon the builder is the vessel??s achievable speed. Investigation was made of the methods of Doctors and Day, whereby the traditional Michell wave-resistance theory, published in 1898, is improved on through a better understanding of the hydrodynamics of transom sterns and the application of statistically determined form facto
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Salian, Rachit Pravin. "Adjustable Energy Saving Device for Transom Stern Hulls." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89490.

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The study presents a numerical investigation about the hydrodynamic characteristics of a transom mounted interceptor on the Oliver Hazard Perry class frigate (FFG-7), in order to assess the potential of propulsion power reduction in a wide range of speeds. This study is aimed to design a stern interceptor with optimal efficiency not only at top speed, but also cruising/transfer speeds, by a simple regulation of its variable geometrical characteristics (from a construction and operational standpoint). A high fidelity numerical model is developed in the open source CFD suite OpenFOAM for the pre
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Banerjee, Sankha Ph D. Massachusetts Institute of Technology. "Three-dimensional effects on flag flapping dynamics ; [and], Study and modeling of incompressible highly variable density turbulence in the bubbly wake of a transom stern." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79313.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 309-328).<br>Part I: A classic problem in the field of fluid-structure interaction is the flapping-flag instability. Fluid-mechanical studies of the phenomenon date back to the 19th century, increased in number in recent years with increasingly accurate representations for the coupled fluid-structure interaction. The problem continues to attract attention because the effect of fluid forces and aspect ratio on stabilit
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Części książek na temat "Transom-stern"

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De Biasea, Mario, Vincenzo Basile, and Simone Mancini. "Stern Flap Solution to Contain the Speed Performance Loss Due to the Ship Weight Growth: An Application on the “De La Penne” Destroyer Class." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200022.

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It is well known that during the lifecycle the growth of the ship’s weight is one of the main sources of the performance-loss. Stern flaps have been used in many recent designs of transom stern vessels, in particular by the US Navy, to increase top speed or to realize improvements in fuel economy over the operating range. Furthermore, stern flap implementation has also become a practical retrofit on the existing platform because significant improvements can be achieved at a minimal cost. According to the US Navy experience, to analyze this aspect, the Ship Design Office of the Italian Navy General Staff performed a preliminary evaluation of the application of this device on own Destroyer hull (De La Penne class), using the CFD U-RANS approach and through experimental test campaign performed at Model Basin of CNR-INM (Council of National Research – Institute of Marine Engineering). This preliminary study was conducted in the model and full scale: several flap angles have been tested with a fixed NACA profile. The results have shown that the major improvements, in terms of power reduction, have been obtained for the interest speed range (Fr = 0.335 – 0.419).
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Yamano, Tadao, Yoshikazu Kusunoki, Fumiyasu Kuratani, Teturo Ikebuchi, and Isao Funeno. "On Scale Effect of the Resistance Due to Stern Waves Including Forward-Oriented Wave Breaking Just Behind a Transom Stern." In Practical Design of Ships and Other Floating Structures, 485–92. Elsevier, 2001. http://dx.doi.org/10.1016/b978-008043950-1/50061-2.

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Rosano, Gennaro, Ermina Begović, Guido Boccadamo, and Barbara Rinauro. "Second Generation Intact Stability Criteria Fallout on Naval Ships Limiting KG Curves." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200047.

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The International Maritime Organization (IMO) finalized the Second Generation Intact Stability Criteria (SGISC), in February 2020. They are intended to be included in Part A of the 2008 International Code on Intact Stability in the following years. The SGISC consider five modes of dynamic stability failure in waves: parametric roll, pure loss of stability, surf-riding/broaching to, dead ship condition and excessive acceleration. In this paper, two semi-displacement, round bilge and transom stern hull forms, the parent hull of the Systematic Series D and the ONR Tumblehome, i.e. typical naval hull forms, are examined. Although naval ships are not directly impacted by SGISC, they are sensitive to dynamic stability failure phenomena due to their geometry and range of service speeds. The procedures to assess the ship vulnerability to the dead ship condition and excessive acceleration criteria, referring to the latest drafts of the criteria (SDC 7/5, 2019), were implemented in Matlab®,. The limiting KG curves associated with this set of criteria were obtained for each vessel. The minimum allowable KG curve associated with the excessive acceleration criterion was compared with the maximum allowable KG curve associated with dead ship condition, to investigate the existence of a safe operational area.
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Streszczenia konferencji na temat "Transom-stern"

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Radojcic, D., T. Rodic, T. Kuvelic, G. J. Grigoropoulos, and D. P. Damala. "Resistance and Trim of Semi-Disp, 2–Chine, Transom–Stern Hulls." In FAST 2001. RINA, 2001. http://dx.doi.org/10.3940/rina.ft.2001.71.

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Zhang, Xin, Huilong Ren, Guoqing Feng, Yifu Liu, and Zhaonian Wu. "Analysis of Local Vibration and Strength of Water Jet Propulsion Unit of High Speed Ship." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77340.

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In recent years, water jet propulsion unit has been widely used in the field of high speed ship. Compared with traditional propeller, water jet propulsion unit has excellent maneuverability with high speed, and lateral force generated by water jet propulsion unit can reduce the radius of turning. High speed ship with water jet propulsion has higher efficiency, lower noise. However, water jet propulsion unit needs to be opened in stern transom plate, and it causes the water jet force when ship is operating, all of these will affect the local strength of stern. It remains to be researched whethe
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Bai, K. J., J. H. Kyoung, and J. W. Kim. "Numerical Computations for a Nonlinear Free Surface Problem in Shallow Water." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28463.

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This paper describes a finite element method applied to a nonlinear free surface flow problem for a ship moving in three dimensions. The physical model is taken to simulate the towing tank experimental conditions. The exact nonlinear free-surface flow problem formulated by an initial/boundary value problem is replaced by an equivalent weak formulation. The same problem was considered earlier by Bai, et. al. [1] where some irregularities were observed in the downstream waves and a transom stern ship geometry could not be treated. In the present paper, specifically, three improvements are made f
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Fullerton, Anne M., and Thomas C. Fu. "Acoustic Doppler Current Profiler (ADCP) Measurements of Breaking Waves." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55313.

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Detailed flow measurements of the turbulent multiphase flow associated with wave breaking present a unique instrumentation challenge. Measurement systems must be capable of high sampling rates, large dynamic ranges, and be capable of making measurements in water, air and optically opaque regions. An experiment was performed at the Naval Surface Warfare Center, Carderock Division, in October 2007 to measure various characteristics of the breaking wave generated from a submerged ship transom. The primary objective of this work was to obtain full-scale qualitative and quantitative flow field data
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Jung, K. H., H. H. Chun, M. C. Kim, I. Lee, K. W. Lee, T. W. Lim, J. K. Lee, K. Kim, S. Yoon, and Y. H. Ryoo. "Experimental Investigation on Stern-Boat Deployment System for Coast Guard Ship." In SNAME Maritime Convention. SNAME, 2008. http://dx.doi.org/10.5957/smc-2008-043.

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The stern boat deployment system was investigated to evaluate the capability of launching and recovering RHIB via the stern ramp. The main parameters to launch and recover RHIB were tested at the design stage. The combined hydrodynamic effect of the stern wake and the water jet flow made it difficult to maintain the maneuvering and seakeeping ability of RHIB approaching to the stern ramp. The safe recovery course was proposed to maintain the directional control of RHIB and to reduce the combined hydrodynamic effect in the transom zone. To evaluate the feasibility of RHIB recovery, the stern si
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Royce, Richard A., and Patrick J. Doherty. "Transom Flow Elevations in the Partially Ventilated Condition." In SNAME 13th International Conference on Fast Sea Transportation. SNAME, 2015. http://dx.doi.org/10.5957/fast-2015-009.

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Predicting separation from a transom stern presents a problem for potential flow calculations. As the vessel speed increases, the transom flow elevation progressively deviates from the static condition. In the absence of viscosity, potential theory is not able to adequately capture this process. Without a priori information regarding the transom flow elevation, potential flow calculations either under or over-predict the resistance. The under-prediction results from placement of the wake sheet at the static condition waterline, and over-prediction results from placement of the wake sheet at th
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Hendrickson, Kelli, Gabriel Weymouth, and Dick Yue. "Video: Flow Structure and Large Scale Air Entrainment in the Wake of a 3D Transom Stern." In 70th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2017. http://dx.doi.org/10.1103/aps.dfd.2017.gfm.v0091.

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Parkyn, Nicholas D. "The Design of the “Dynabout” - The Dynaplane Concept Applied to the Design of a More Efficient Outboard Powered Recreational Runabout." In SNAME 13th International Conference on Fast Sea Transportation. SNAME, 2015. http://dx.doi.org/10.5957/fast-2015-017.

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The Dynaplane concept has many real advantages and benefits, but has not enjoyed the acceptance that it deserves. The Dynaplane concept was originally conceived for application to craft over 20ft in length powered by inboard engine with drive leg mounted well forward of transom, a transom mounted rudder and v-shaped stern foil configuration. The author has revised, revisited and simplified some aspects of the original Dynaplane concept to realize its application to a 16.5ft (5m) outboard powered “runabout” style craft which should appeal to the recreational boating market. Since research and p
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Fu, Thomas C., Eric Terrill, Anne M. Fullerton, and Genevieve Lada Taylor. "A Comparison of the Model and Full Scale Transom Wave of the R/V Athena." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20595.

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Over the past few years the U.S. Office of Naval Research has sponsored a series of measurements of the transom wave of the R/V Athena and of a 1/8.25-scale model (NSWCCD Model 5365) of the ship. The objectives of the testing were to characterize the free surface wave behind the ship’s transom at both model and full scale for use in identifying hydrodynamic features and for developing and validating numerical simulation tools. The focus of this paper is the comparison of these full scale and model scale measurements, specifically a comparison of the time-averaged free-surface stern wave profil
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Sun, Hui, and Odd M. Faltinsen. "Numerical Study of a Semi-Displacement Ship at High Speed." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20565.

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A numerical analysis of a semi-displacement ship at high forward speed is performed by using a 2D+t theory. Time dependent two-dimensional (2D) boundary value problems are solved in space-fixed vertical planes by a Boundary Element Method (BEM). The steady advancing of the ship in the calm water is simulated, although the theory is also capable of solving the unsteady problem with forced oscillations in heave and/or pitch. The numerical results for the steady motions are compared with Keuning’s experiments [1]. The sectional vertical forces along the ship and the wave elevation around the ship
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Raporty organizacyjne na temat "Transom-stern"

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Chen, Chu Y. Predictions of Transom Stern Hull Resistance by Two Potential Flow Panel Methods. Fort Belvoir, VA: Defense Technical Information Center, November 1989. http://dx.doi.org/10.21236/ada217949.

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Haussling, H. J., R. W. Miller, and R. M. Coleman. Computation of High-Speed Turbulent Flow about a Ship Model with a Transom Stern. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada330142.

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Fu, Thomas, Anna Karion, Anne Pence, James Rice, Don Walker, and Toby Ratcliffe. Characterization of the Steady Wave Field of the High Speed Transom Stern Ship - Model 5365 Hull Form. Fort Belvoir, VA: Defense Technical Information Center, September 2005. http://dx.doi.org/10.21236/ada441904.

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