A Comparison of Methods for Computing the Added Resistance

Joncquez, Soizic; Andersen, Poul; Bingham, Harry B.

doi:10.5957/josr.56.2.100003

Cited by 8 publications

(1 citation statement)

References 3 publications

(4 reference statements)

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“…Many researchers have contributed to the de velopment of numerical solutions for a ship with forward speed in waves, for example, Guevel and Bougis [1], Wu and Eatock Taylor [2], and Iwashita and Ohkusu [3]. Joncquez et al [4] com puted the added wave resistance in the time domain using a higher order panel method. Kim and Kim [5] studied the added wave re sistance in the time domain by comparing the solutions by the Neumann-Kelvin and double-body free surface linearizations.…”

Section: Introductionmentioning

confidence: 99%

Computation of Motion and Added Wave Resistance With the Panel-Free Method

Peng

Qiu

2014

Journal of Offshore Mechanics and Arctic Engineering

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Computations have been performed to predict motions and added wave resistances fo r ships at forward speeds. The radiation and diffraction problems o f a ship with forward speed are solved with the panel-free method in the frequency domain. In this paper, the effect o f the m-terms and forward-speedi zero-speed Green functions (GFs) on the solutions are investigated using two Wigley hull ships. Computed motions, hydrodynamic coefficients, and added wave resistances were compared with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Computation of Motion and Added Wave Resistance With the Panel-Free Method

Peng

Qiu

2014

Journal of Offshore Mechanics and Arctic Engineering

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Boundary‐Element Methods and Wave Loading on Ships

Κώστας¹,

Kaklis

Politis

et al. 2017

Encyclopedia of Computational Mechanics Second Edition

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The hydrodynamic problem of a ship moving with constant forward speed while undergoing small‐amplitude oscillatory motions about its mean steady‐state position is modeled as a boundary‐integral equation (BIE) involving surface distributions of the fundamental solution of Laplace's equation and its derivatives and alternative Green functions. The chapter reviews the various low‐order and higher order boundary‐element methods (BEMs) developed for the numerical solution of these BIEs via collocation or Galerkin techniques involving finite‐dimensional bases for representing the involved geometric configuration and approximating the unknown physical quantities. Then, we focus on presenting and discussing recent experience gained from embedding BEMs into isogeometric analysis (IGA) for the linear wave‐resistance problem. Two IGA‐BEM solvers, based on nonuniform rational B‐spline (NURBS) and T‐spline representations of the ship hull, are presented and compared for the so‐called Neumann–Kelvin formulation of this problem. The local refinement capabilities of the adopted T‐spline representation of the ship geometry leads to a solver with higher accuracy and efficiency as compared to the corresponding NURBS‐based solver. Furthermore, the developed hydrodynamic solvers, along with the corresponding ship‐parametric models, are integrated within an optimization environment, which is tested in two optimization problems. The first problem, of local optimization character, focuses on the optimization of the bulbous shape of a container ship against the criterion of minimum wave resistance. The second case performs a global hull‐shape optimization of a container ship targeting the minimization of both the total resistance and the deviation from a target deadweight. The chapter ends with a brief discussion for further research toward broadening the coverage of IGA‐BEM methods in application areas related to ship wave loads.

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A velocity decomposition approach for three-dimensional unsteady flow

Chen

Maki

2017

European Journal of Mechanics - B/Fluids

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A velocity decomposition method is developed for the solution of three-dimensional, unsteady flows. The velocity vector is decomposed into an irrotational component (viscous-potential velocity) and a vortical component (vortical velocity). The vortical velocity is selected so that it is zero outside of the rotational region of the flow field and the flow in the irrotational region can thus be solely described by the viscous-potential velocity. The formulation is devised to employ both the velocity potential and the Navier-Stokes-based numerical methods such that the field discretization required by the Navier-Stokes solver can be reduced to only encompass the rotational region of the flow field and the number of unknowns that are to be solved by the Navier-Stokes solver is greatly reduced. A higher-order boundary-element method is used to solve for the viscous potential by applying a viscous boundary condition to the body surface. The finite-volume method is used to solve for the total velocity on a reduced domain, using the viscous-potential velocity as the boundary condition on the extent of the domain. The two solution procedures are tightly coupled in time. The viscous-potential velocity and the total velocity are time dependent due to the unsteadiness in the boundary layer and the wake. The solver is applied to solve three-dimensional, laminar and turbulent unsteady flows. For turbulent flows, the solver is applied for both Unsteady-Reynolds-Averaging-Navier-Stokes and Large-Eddy-Simulation computations.

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A Comparison of Methods for Computing the Added Resistance

Cited by 8 publications

References 3 publications

Computation of Motion and Added Wave Resistance With the Panel-Free Method

Computation of Motion and Added Wave Resistance With the Panel-Free Method

Boundary‐Element Methods and Wave Loading on Ships

A velocity decomposition approach for three-dimensional unsteady flow

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