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Design of ship's bow form by potential-based panel method

OCEAN ENGINEERING 2007年第8-9期34卷 1089-1095页

作者： Yoo, Jaehoon Korea Ocean Res & Dev Inst Maritime & Ocean Engn Res Inst Taejon 305343 South Korea

A surface panel method treating a boundary-value problem of the Dirichlet type with the free surface is presented to design a three-dimensional body corresponding to a prescribed pressure distribution. The free surface boundary condition is linearized with respect to the oncoming flow, and computed by four-point finite difference scheme. Sample designs for submerged spheroids and Wigley hull are carried out to demonstrate the stable convergence, the effectiveness and the robustness of the method. The design of a 5500TEU container carrier is performed with respect to reduction of the wave resistance. To reduce the wave resistance, calculated pressure on the hull surface is modified to have the lower fluctuation, and is applied as a Dirichlet type dynamic boundary condition on the hull surface. The designed hull form is verified to have the lower wave resistance than the initial one not only by computation but also by experiment. (c) 2006 Published by Elsevier Ltd.

关键词： potential-based panel method Dirichlet type boundary condition wave resistance hull form design pseudo-local flux

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A 3D potential-based and desingularized high order panel method

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OCEAN ENGINEERING 2001年第11期28卷 1499-1516页

作者： Kouh, JS Suen, JB Natl Taiwan Univ Dept Naval Architecture & Ocean Engn Taipei Taiwan

In this paper, a novel high order panel method based on doublet distribution and Gaussian quadrature was adopted to deal with the potential flow problem. In the geometry representation we employed both the exact surface and NURBS surface form to construct the surface panel. These data were calculated directly from the mathematical shape definition. Furthermore, no fixed order of doubler density distribution was assumed on each panel. Not only the number of panels could be chosen, but also the Gaussian order of each panel. The numerical results for sphere, ellipsoid and Wigley hull demonstrated here indicated that the present method was adapted to the potential flow problem. Moreover, the NURBS surface geometry representation was capable of further potential flow optimal calculation. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： high order panel method potential-based panel method doublet NURBS surface

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Prediction of wave pattern and wave resistance of surface piercing bodies by a boundary element method

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INTERNATIONAL JOURNAL FOR NUMERICAL methodS IN FLUIDS 2008年第3期56卷 305-329页

作者： Bal, Sakir Istanbul Tech Univ Fac Naval Architecture & Ocean Engn TR-80626 Istanbul Turkey

An iterative boundary element method, which was originally developed for both two- and three-dimensional cavitating hydrofoils moving steadily under a free surface, is modified and extended to predict the wave pattern and wave resistance of surface piercing bodies, such as ship hulls and vertical struts. The iterative nonlinear method, which is based on the Green theorem, allows the separation of the surface piercing body problem and the free-surface problem. The free-surface problem is also separated into two parts;namely, left and right (with respect to x axis) free-surface problems. Those all (three) problems are solved separately, with the effects of one on the other being accounted for in an iterative manner. The wetted surface of the body (ship hull or strut, including cavity surface if exists) and the left and right parts with respect to x axis of free surface are modelled with constant strength dipole and constant strength source panels. In order to prevent upstream waves, the source strengths from some distance in front of the body to the end of the truncated upstream boundary are enforced to be zero. No radiation condition is enforced for downstream and transverse boundaries. A transverse wave. cut technique is used for the calculation of wave resistance. The method is first applied to a point source and a three-dimensional submerged cavitating hydrofoil to validate the method and a Wigley hull and a vertical strut to compare the results with those of experiments. Copyright (C) 2007 John Wiley & Sons, Ltd.

关键词： wave resistance ship waves free surface vertical strut boundary element method potential-based panel method wave pattern cavitating vertical hydrofoil surface piercing strut

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A numerical method for the prediction of wave pattern of surface piercing cavitating hydrofoils

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2007年第12期221卷 1623-1633页

作者： Bal, S. Istanbul Tech Univ Fac Naval Architecture & Ocean Engn TR-34469 Istanbul Turkey

The iterative boundary-element method, which is originally developed before for submerged cavitating hydrofoils is extended and modified to predict the wave pattern and lift and drag values of surface piercing cavitating hydrofoils (vertical struts) moving with a constant speed on the free surface. The iterative numerical method, which is based on the Green's theorem, allows the separation of surface piercing cavitating hydrofoil (or vertical strut) problem and the free surface problem. Those problems are solved separately, with the effects of one on the other being accounted for in an iterative manner. The wetted surface of the body (hydrofoil or strut) and the free surface are modelled with constant strength dipole and constant strength source panels. In order to prevent upstream waves the source strengths from some distance in front of the body to the end of the truncated upstream boundary are enforced to be zero. No radiation condition is enforced for downstream and transverse boundaries on the free surface. The method is applied to a rectangular non-cavitating hydrofoil with a yaw angle to compare the results with those of experiments and other numerical methods given in the literature. Then, the method is applied to a rectangular cavitating vertical strut and the effects of Froude number on wave pattern and lift and drag values of vertical strut are discussed.

关键词： surface piercing cavitating hydrofoil vertical strut Kelvin wave pattern free surface boundary-element method potential-based panel method

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RESEARCH ON HULL-FORM OPTIMIZATION OF A PASSENGER SHIP USING HULL-FORM MODIFICATION ALGORITHM WITH GAUSSIAN DISTRIBUTION FUNCTION

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BRODOGRADNJA 2016年第3期67卷 1-16页

作者： Choi, Hee-Jong Yoon, Hyun-Sik Chonnam Natl Univ Dept Naval Architecture & Ocean Engn Yeosu South Korea Pusan Natl Univ Global Core Res Ctr Ships & Offshore Platforms Busan South Korea

The present study proposes an automatic hull form control algorithm to effectively control the hull form of a ship. A Gaussian distribution function is implemented in the proposed algorithm that automatically controls the hull form in conjunction with an optimization algorithm that is executed during the hull form optimization procedure. The hull form optimization algorithm adopts sequential quadratic programming for the optimizer, and the wave-making resistance is used as an objective function and is solved using the potential-based panel method. A high-speed passenger ship is selected as the target ship, and the results of a numerical analysis of the original hull are compared to those of the optimized hull obtained using the hull form optimization in order to verify the effectiveness of the hull-form optimization technique using the proposed automatic hull form control algorithm.

关键词： Hull-form modification Hull-form optimization Gaussian distribution function Passenger ship potential-based panel method Sequential quadratic programming Wave-making resistance

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Second-order free surface effect on cavitating 3-D hydrofoils

Second-order free surface effect on cavitating 3-D hydrofoil...

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11th International Offshore and Polar Engineering Conference (ISOPE-2001)

作者： Bal, S Istanbul Tech Univ TR-80626 Istanbul Turkey

ISBN: (纸本)1880653559

The iterative method which is originally developed before for the three-dimensional cavitating hydrofoils moving with constant speed under a free surface is extended to include the second-order free surface effect into the calculations. The iterative nonlinear method is based on the Green's theorem and allows separating the cavitating hydrofoil problem and the free surface problem. These two problems are solved separately, with the effects of one on the other being accounted for in an iterative manner. The cavitating hydrofoil surface and the free surface are modeled with constant strength dipole and constant strength source panels. The second-order free surface effect is included into the calculations by the technique of small perturbation expansion both for the potential and for the wave elevation on the free surface. The source strengths on the free surface are expressed in terms of perturbation potential by applying first-order (linearized) and second-order free surface conditions. No radiation condition is enforced for downstream and transverse boundaries. Second-order free surface effect on cavitation characteristics and wave elevations is discussed.

关键词： second-order free surface cavitating hydrofoil potential-based panel method

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