On Ships With Zero and Small Wave Resistance

Yim, B.

doi:10.21236/ad0414680

Cited by 5 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) + S, Cl) K^cos-^^y dd Namely the amplitude function of the elementary waves from the bow for all angle (' in (28) can be made zero by attaching at the bow a concentrated doublet line which extends to infinite depth. Since the deeply submerged part does not influence too much the surface waves (Yim, 1963) this clarifies the mechanism of the bulb and backs up the approach made by .…”

Section: Ijmentioning

confidence: 70%

“…The optimum distribution of the concentrated singularities at the finite stern line for several given ship source distributions are calculated (Yim 1963) and shown in Figs, 3-7. These indicate that the strength of the singularities at the deepest point (the same level as the keel) is the largest. Especially for the higher Froude numbers, the optimum distributions appear to be almost concentrated at the keel.…”

Section: Appendix 1 Methods Of Evaluation Of Variances Of Relative Motion and Velocity Between Wave And Ship Bowmentioning

confidence: 99%

See 1 more Smart Citation

Ship motions and drag reduction / [J.K. Lunde, Stanley W. Doroff, editors.]

Doroff¹,

Lunde²

1966

View full text Add to dashboard Cite

Since the Symposium on the Behavior of Ships in a Seaway (Wageningen, 1957), many papers have been published on the theory of ship motions.The present paper is a survey, collation, and evaluation of those contributions which have led toward a rational theory for predicting ship motions.During this period, evidence has accumulated which demonstrates the validity of the superposition principle for ship motions in a seaway. This concept was stated as hypothesis eleven years ago by St. Denis and Pierson (and also sixty years ago by R. E. Froude); its validity may now be considered as proven, beyond the fondest hopes of earlier investigators.With this principle established, attention once again returns to the prediction of motions in small-amplitude regular waves. The best practical approach to making ship motions predictions is probably still through use of strip theory. However, the two-dimensions assumptions 'A more precise definition is that p[aj

show abstract

Section: Ijmentioning

confidence: 70%

Section: Appendix 1 Methods Of Evaluation Of Variances Of Relative Motion and Velocity Between Wave And Ship Bowmentioning

confidence: 99%

Ship motions and drag reduction / [J.K. Lunde, Stanley W. Doroff, editors.]

Doroff¹,

Lunde²

1966

View full text Add to dashboard Cite

show abstract

“…The comparison between total resistance of the forms with bulb and total resistance of the forms without bulb are done via Equation (11). Thus, it is determined that, how much increase (+) or decrease (-) are on the total resistance according to the bulb shapes.…”

Section: Comparison Of Cfd Results With Test Resultsmentioning

confidence: 99%

“…Later, Bragg [4], Inui et al [5], Ferguson [6], and Muntjewerf [7] experimentally conducted experiments on the Δ (delta) type, cylindrical and conical bulbs, which are known as Taylor bulbs, by systematically changing the bulb parameters. Weinblum [8], Wigley [9], Inui [10] and Yim [11] studied on the theory of linearized wave resistance theoretically. Inui [10] presented a method to determine the size of the bulb by matching amplitude functions of bulb in regular waves and stem.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Investigation of the Effects of Various Bulbous Bows on Resistance of Fishing Boats

Saral

Aydin

Köse

2018

brod

View full text Add to dashboard Cite

Realizable k  Model and Volume of Fluid (VOF) method. The total resistance values obtained by the CFD analyses and by the existing test results via Froude and Hughes methods are compared and examined. Thus, the method and reference values of CFD analyses are determined for the hull forms with bulbs which do not have test results. Subsequently, the CFD results of frictional resistance, pressure resistance and total resistance values for actual hulls and hulls with bulbs are compared. Following the examination of results in terms of CB, L/B and bulb types, it is determined that the elliptical bulb type is the most suitable bulb type for the fishing vessels.

show abstract

“…Almost all the experimental studies were done on either Taylor bulbs (bottom heavy or ∆ type bulb) or cylindrical bulbous bows. Theoretically, Wigley (1936), Weinblum (1935), Inui (1962), and Yim (1963) studied the linearized theory of wave resistance in detail. Though the theory gives a better understanding of bulb action it is still difficult to design the bulb for given constraints because of a lack of quantitative guidelines.…”

Section: Review Of Literaturementioning

confidence: 99%

Practical Hydrodynamic Design of Bulbous Bows for Ships

Sharma

Sha

2005

Naval Engineers Journal

View full text Add to dashboard Cite

design of bulb parameters has also been briefly examined. The results of this study are presented in the form of design parameters related to main hull parameters for a set of input data in a narrow range. The first six parameters have been derived by re-correlation with statistical analysis and the seventh parameter by reanalysis of an approximate linear theory with sheltering effect for resistance estimation. Finally, a design example, which includes tank test results, of an additive bulbous bow for a container ship has been presented. AbstractAlthough in modern times, bulbous bows have become an integral part of commercial ships, the hydrodynamic design of bulbous bows is still difficult because of costly tank tests and patent-driven knowledge banks. The design of a bulbous bow is needed even at the preliminary design level to predict speed and power. In this work, a design method is presented that combines and extends two famous theories i.e., Kracht (1978a) and Yim (1980) for a particular set of requirements within a narrow range of parameters. The method uses a reanalysis of an approximate linear theory with sheltering effect for resistance estimation, and re-correlation with statistical analysis via a non-linear multivariate regression analysis from existing literature and tank test results available in the public domain. The optimization of design parameters has been done for the design speed. The effect of change in the speed has been discussed and suitably incorporated in the design process. In the present work, the effect of production constraints on the T E C H N I C A L P A P E RNAVAL ENGINEERS JOURNAL WINTER 2005 5 7 NOMENCLATURE ABL = area of ram bow in longitudinal direction, m 2 ABT = cross-sectional area at forward perpendicular (FP), m 2 AMS = mid-ship sectional area, m 2 BB = maximum breadth of bulb area A BT , m BMS = breadth of ship at mid-ship section, m CB or Cb, CM, CP, CPE, CWL = block, mid-ship, prismatic, entrance prismatic, waterplane area coefficients respectively CF, CR = frictional and residual resistance coefficients respectively CP R, ∆CP R = residual power displacement, residual power displacement reduction coefficient respectively CABL = lateral parameter CABT = cross-sectional parameter CBB = breadth parameter CLPR = length parameter C ∀PR = volumetric parameter in percentage distributed forward of FP CZB = depth parameter CCG = volumetric longitudinal distribution parameter C∀BTOT = volumetric parameter distributed aft and forward of FP Fn = Vs/ √ g• LLWL = Froude number FP = forward perpendicular HAP, HFP = draft at AP, and FP respectively H = average draft, B = average breadth of ship H1 = H/LLWL H B = height of A BT , m ∆ ∆

show abstract

On Ships With Zero and Small Wave Resistance

Cited by 5 publications

References 0 publications

Ship motions and drag reduction / [J.K. Lunde, Stanley W. Doroff, editors.]

Ship motions and drag reduction / [J.K. Lunde, Stanley W. Doroff, editors.]

A Systematic Investigation of the Effects of Various Bulbous Bows on Resistance of Fishing Boats

Practical Hydrodynamic Design of Bulbous Bows for Ships

Contact Info

Product

Resources

About