2 edition of optimization of hull forms using viscous and wave resistance theory. found in the catalog.
optimization of hull forms using viscous and wave resistance theory.
G. E. Gadd
|Series||NMI report -- R151|
|Contributions||National Maritime Institute.|
Wave-making resistance A ship moving over the surface of undisturbed water sets up waves emanating from the bow and stern of the ship. The waves created by the ship consist of divergent and transverse waves. The divergent wave are observed as the wake of a ship with a series of diagonal or oblique crests moving outwardly from the point of. The "optimal" hull forms found in the 's were very strange wobbly shapes. One, named Ward's Optimum Symmetric Ship was bundled with Michlet as an example. Aslo see: Ward, Lawrence W., Wave resistance surveys on a ship model of minimum resistance, Webb Inst. of Naval Arch. August , pp. (+ errata).
A stabilized semi-implicit fractional step algorithm based on the finite element method for solving ship wave problems using unstructured meshes is presented. The stabilized governing equations for the viscous incompressible fluid and the free surface are derived at a differential level via a finite calculus by: Hydrodynamics of High-Speed Marine Vehicles, first published in , discusses the three main categories of high-speed marine vehicles - vessels supported by submerged hulls, air cushions or foils. The wave environment, resistance, propulsion, seakeeping, sea loads and manoeuvring are extensively covered based on rational and simplified by: 1.
Isogeometric boundary-element analysis for the wave-resistance problem using T-splines Isogeometric boundary-element analysis for the wave-resistance problem using T-splines Ginnis, A.I.; Kostas, K.V.; Politis, C.G.; Kaklis, P.D.; Belibassakis, K.A.; Gerostathis, Th.P.; Scott, M.A.; Hughes, T.J.R. In this paper we couple collocated Boundary . total resistance of a ship, especially for relatively “full” hull forms and/or at high speeds. Experience has shown that the wave-making resistance component is quite sensitive to changes to hull-form shape and significant reduction can be achieved without affecting cargo capacity. During the last 50 years, the interest in numerical methods.
Management of unit banks
handbook of colour
Recovering vanadium from dolomitic Nevada shale, by P.T. Brooks and G.M. Potter
ways of our railways
A Kiss in Winter
The theory of political economy.
Essentials of petroleum.
Powder River reunion.
The paper describes a fully automatic computer-aided method for optimization of ship hull forms from the resistance point of view. The method is based on the well-known code SHIPFLOW for the determination of the flow around the ship hull and the OCTOPUS code for the solution of the formulated nonlinear optimization problem.
Parametric Optimization of SWAT-Hull Forms by a Viscous-Inviscid Free Surface Method Driven by a Differential Evolution Algorithm. pure wave resistance or total resistance, at different given Author: Stefano Brizzolara. Hull form optimization from a hydrodynamic performance point of view is an important aspect of ship design.
This paper presents a computational method to estimate the ship resistance (viscous and. INTRODUCTION r ~7 ~~ ¢ ~ ~ In optimization of ship hull form, we often optimize in such a way that the wave resistance takes the minimum value, because the wave resistance theory based on potential theory doesn't require much computational cost.
The hull form design and its optimization are based on the systematic variation of the longitudinal distribution of the hull volume, while the vertical volume distribu-tion is fixed or highly controlled.
Such design process is underpinned with the respective data analysis of the obtained results, which are presented as the optimum distribution File Size: 1MB. To reduce the ship wave-making resistance, the lines of the bulbous bow of a hull are optimized by an automatic optimization platform at the ship design stage.
Parametric modeling was applied to the hull by using non-uniform rational basis spline (NURBS). The Rankine-source panel method was used to calculate the wave-making resistance. A hybrid optimization strategy was Cited by: 2.
In this article the problem of ship hull shape improvement for reduced drag is described from the viewpoint of mathematical optimization. The approach concentrates on methods of shape variation and flow analysis by Computational Fluid Dynamics.
This still evolving methodology will be illustrated by a few examples of hydrodynamic by: 2. As shown in Fig. 1, total hull resistance is divided into wave resistance and viscous resistance. The present study ignores the effect of wave resistance on optimization process.
Download: Download high-res image (KB) Download: Download full-size image; Fig. The components of total hull by: 1. Ralph Baker Optimization of the length of a Surf Ski Kayak MAR An example of a graph showing the total viscous resistance The viscous resistance (pink) and frictional resistance (blue) follow exactly the same path in this because the other factor in viscous resistance which comes from form factor is neglected.
This book discusses the problem of optimizing ship’s hulls, highlighting the key technologies of ship optimization design and presenting a series of hull-form optimization platforms. It includes several improved approaches and novel ideas with significant potential in this field wave resistance mesh minimum numerical Vast research is being done in hydrodynamics to reduce power by modifying the ship hull form and its optimization requires a lot of skill and knowledge about many aspects like the pressure distribution, components of resistance and sea state.
Viscous resistance and wave making resistance mainly. Xie L, Feng BW, Liu ZY () Automatic optimization of high-speed hull forms using CFD.
J Huazhong Univ Sci Tech (Ntl Sci Edition), 39(6): – Google Scholar Shape optimization is a very time-consuming and expensive task, especially if experimental tests need to be performed.
To overcome the challenges of geometry optimization, the industry is increasingly relying on numerical simulations. These kinds of problems typically involve the interaction of three main applications: a solid modeler, a multi-physics solver, and an by: 3. Application to Michell’s wave resistance Conclusion About the optimization problem for ω ﬁxed 1st idea: ﬁnding a ship of minimal wave resistance among admissible functions f: ω → R+, for a constant speed U and a given volume V of the hull.
f 7→R Michell(f) is a positive semi-deﬁnite quadratic functional, but. (Wave-breaking resistance, although it shows up in certain experiments as viscous resistance, will be lumped here with wave resistance). This still leaves great freedom in designing the hull, and experience and observation have shown that optimum designs (from thestandpoint of resistance) are those that make the smallest by: A final section provides guidance to the naval architect in designing a hull form.
Design procedures are described for achieving favorable flow and resistance characteristics of the hull and appendages. Examples are given for ships designed for high, medium and low speeds. Design considerations affecting both wave and viscous effects are included.
Practical Ship Hydrodynamics, Second Edition, introduces the reader to modern ship hydrodynamics. It describes experimental and numerical methods for ship resistance and propulsion, maneuvering, seakeeping, hydrodynamic aspects of ship vibrations, and hydrodynamic options for fuel efficiency, as well as new developments in computational Author: Volker Bertram.
Resistance and seakeeping characteristics of fast transom stern hulls with systematically varied form / Erkki Lahtiharju, Toumo Karppinen, Matti Hellevaara, Timo Aitta ; Resistance of a systematic series of semiplaning transom-stern hulls / Roger H.
Compton ; Resistance prediction and optimization of low deadrise, hard chine, stepless planing. Hydrodynamic model. Discussion in 'Hydrodynamics and different between model Cw and theoretical Cwp due to the presence of wave breaking resistance and interaction between viscous pressure and wave pattern resistance.
Also regarding the work on linear potential codes (or even nonlinear); i have noticed few studies on low-L/B hull forms for. Calculation by Insel and Molland Theory. Viscous and Wave Interferences present for catamaran resistance calculation.
Strength and Section Modulus by Lloyd’s Rules, interpolated linearly from given tables w.r.t length and speed to length ratio. Model making chapter help understand basic model making and fiberglass technology. FRP boat. |t The Lafitte skiff: an intact stability study / |r Jim Gunter -- |t The Maine lobsterboat: an introduction / |r Michael Porter -- |t The new America's Cup Rule -- a search for the performance edge / |r James K.
Antrim -- |t The planning, design, and construction of fast response fireboats for the Port of Vancouver / |r Donald J. Pamplin.Available online 23 March Abstract Fuel efﬁciency optimization is of crucial importance in industries.
Marine transportation industry is no exception. Multi-disciplinary opti- mization is a branch of engineering which uses optimization methods for solving problems in which the objective function is simultaneously.The paper presents a case study for resistance and motion behavior of a tanker ship in oblique waves.
Initially, head wave cases were simulated for the KRISO Very Large Crude Carrier 2 (KVLCC2) model using an in-house Reynolds averaged Navier Stokes (RaNS) solver, SHIP_Motion, and results are validated with experimental data.
Next, simulations were Author: Hafizul Islam, Md. Mashiur Rahaman, Hiromichi Akimoto.