The optimization of hull forms using viscous and wave resistance theory

1983 ◽  
Vol 30 (352) ◽  
pp. 285-298
Author(s):  
G.E. Gadd
Keyword(s):  
Wave Resistance ◽  
Resistance Theory ◽  
Hull Forms

scholarly journals A Trial of Determining High Speed Practical Hull Forms by the Aid of the Minimum Wave Resistance Theory

1977 ◽  
Vol 1977 (141) ◽  
pp. 1-9
Author(s):  
Hajime Maruo ◽  
Kazuko Kasahara ◽  
Zensuke Takusagawa ◽  
Hiroshi Okada
Keyword(s):  
High Speed ◽  
Wave Resistance ◽  
Resistance Theory ◽  
Hull Forms

scholarly journals The Low Speed Wave Resistance Theory Imposing Accurate Hull Surface Condition

1979 ◽  
Vol 1979 (146) ◽  
pp. 27-34
Author(s):  
Yoshihiro Shimomura ◽  
Takamune Kitazawa ◽  
Takao Inui ◽  
Hisashi Kajitani
Keyword(s):  
Surface Condition ◽  
Wave Resistance ◽  
Low Speed ◽  
Resistance Theory

Wave Pattern Measurements Using a Half-Ship Model

1977 ◽  
Vol 21 (03) ◽  
pp. 148-156
Author(s):  
Gerald E. Bellows
Keyword(s):  
High Speed ◽  
Wave Pattern ◽  
Wave Resistance ◽  
Ship Model ◽  
Cut Method ◽  
Hull Forms

This report describes an investigation of the wave pattern of a half-ship model. Using a 5-ft (1.6 m) ship model that has been cut in half along the vertical centerline plane and by towing this half model very close to one wall of the model tank, a wave pattern corresponding to that produced on one side of a symmetric ship model is obtained. The longitudinal-cut method is used to measure the wave pattern. Comparisons of the wave resistance of the half model and whole model are given. It is apparent from these that the results are in agreement for distances from the wall of less than 3 in. (76 mm). These results show that the length of a longitudinal cut before reflection occurs can be doubled by using this procedure rather than towing a conventional ship model in the center of the tank. This is especially useful for tests of high-speed hull forms.

Added Wave Resistance Computations Using Desingularized Source and Panel Methods

2015 ◽  
Author(s):  
Xinshu Zhang ◽  
Wei Li ◽  
Yunxiang You
Keyword(s):  
Equations Of Motion ◽  
Three Dimensional ◽  
Wave Resistance ◽  
Boundary Integral ◽  
Time Step ◽  
Panel Methods ◽  
Calm Water ◽  
Constant Strength ◽  
Hull Forms ◽  
Large Amplitude Motion

A three-dimensional time-domain approach has been developed to compute large-amplitude motion response and the second-order added wave resistance for ships traveling in waves. The proposed method is an extension of a well established linear approach developed in a previous paper [1]. The numerical model is developed based on boundary integral equation, which is solved at each time step by distributing desingularized sources above the calm water surface and employing constant-strength panels on body surface. The nonlinear Froude-Krylov and wave diffraction forces are computed. Equations of motion are solved with including the effects of Euler angles. A broad range of different hull forms, including two Wigley hulls, a Series 60 hull, and a S-175 hull, are employed to validate the present computational model. By comparing the obtained numerical results to experiments, it is demonstrated that the present model using double-body basis flow can well predict added wave resistance.

Statistical Prediction of Ship’s Effective Power Using Theoretical Formulation and Historic Data

1987 ◽  
Vol 24 (03) ◽  
pp. 237-245
Author(s):  
Cheng-Wen Lin ◽  
William G. Day ◽  
Wen-Chin Lin
Keyword(s):  
Early Stage ◽  
Wave Resistance ◽  
Statistical Prediction ◽  
Design Development ◽  
Geometric Information ◽  
Theoretical Formulation ◽  
Basic Physics ◽  
Historic Data ◽  
Hull Forms ◽  
Test Database

This paper reports on the progress in developing a tool that easily provides reliable resistance predictions for all candidate hull forms, using only the geometric information available at an early stage of design development. Parallel to model testing, the methodology is based on Froude's hypothesis. However, the residuary resistance is now predicted by a technique that combines a theoretical formulation for wave resistance and form drag with a statistical regressional analysis of a historic model-test database. The theoretical formulation accounts for the basic physics, while the regressional analysis provides the quantitative answers. The merit of the present tool is evaluated through comparison with other existing techniques and through its application to several actual hull designs.

Numerical Study of a Slender-Ship Theory of Wave Resistance

1985 ◽  
Vol 29 (02) ◽  
pp. 81-93
Author(s):  
Francis Noblesse
Keyword(s):  
Froude Number ◽  
Numerical Study ◽  
Near Field ◽  
Field Potential ◽  
Analytical Approximation ◽  
Wave Resistance ◽  
Theoretical Predictions ◽  
Wigley Hull ◽  
The Green Function ◽  
Hull Forms

This study is a continuation of the previous numerical study by Chen and Noblesse [1]2 of the slender-ship theory of wave resistance presented in Noblesse [2]. Results of systematic calculations of wave resistance are presented for three simple sharp-and round-ended strut-like hull forms having beam/length and draft/length ratios equal to 0.15 and 0.075, respectively. Numerical results are presented for the first order slender-ship approximation and for seven closely related wave-resistance approximations. The nondimensional wave-resistance values associated with these eight approximations are plotted versus the Froude number in the range 1 ≥ F ≥ 0.18. The Kochin wave-energy function corresponding to four approximations is also depicted for three Froude-number values. The wave potential is shown to have more pronounced effects upon the wave resistance, causing large phase shifts in particular, than the nonoscillatory near-field potential. A simple analytical approximation to the near-field term in the Green function is proposed. Finally, theoretical predictions are compared with experimental data for the Sharma strut and the Wigley hull.

Optimal Ship Forms for Minimum Wave Resistance

1981 ◽  
Vol 25 (02) ◽  
pp. 95-116
Author(s):  
Chi-Chao Hsiung
Keyword(s):  
Linear Inequality ◽  
Inequality Constraints ◽  
Wave Resistance ◽  
Ship Hull ◽  
Towing Tank ◽  
Ship Model ◽  
Linear Inequality Constraints ◽  
Merchant Ship ◽  
Programming Techniques ◽  
Hull Forms

By introducing a set of "tent" functions to approximate the ship hull function, the Michell integral for wave resistance is reduced to a standard quadratic form in terms of ship offsets. With linear-inequality constraints of the type 0 ≤ H(x, z) ≤ B;C ≤ Hx(x,z) ≤ D(where H(x,z) is the hull function and B, C, D are constants), we are able to find various optimal ship forms of minimum wave resistance by applying quadratic programming techniques to the problem. Three optimal forms have been chosen among a number of computed results for tests in the ship-model towing tank. All three models have afterbodies identical with that of Series 60, Block 60, a standard merchant ship hull of good quality. Although the experimentally determined residuary resistance is in no better agreement with the theoretically predicted results than is usual in such comparisons, the order of "goodness" of the hull-forms as predicted and as measured was the same for Fn ≥ 0.36 and also for 0.20 ≤ Fn ≤ 0.26.

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