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Study on estimating fluid force acting on a hull during maneuvering movement; Soju undoji no sentai ni sayosuru ryutairyoku no suitei ni kansuru kenkyu

Abstract

With types of general cargo vessel and VLCC vessel as the object of discussion, a method was discussed to estimate fluid force acting theoretically on a hull during maneuvering movement, taking frame line shape into consideration. A vortex model was improved by giving consideration of time-based decay on intensity of discrete vortex lines based on the Rankine vortex. Modeling of flow fields around a hull was attempted to deal with movements in which width and draft are small as compared with the ship length, and turning angle speed and deviation angle are small. It was assumed that the ship speed is slow and effects of waves can be disregarded. Specular images of the hull were taken with regard to free surface, and handled as a double body model. Speed potential to express flow fields around a hull is required to satisfy the following five boundary conditions of Laplace, substance surface, free vortex layers, infinity and exfoliation. The potential may be handled as a two-dimensional problem in a field near the hull by using assumption of a slender and long body and conformal mapping. It was found possible to estimate hull fluid force with relatively good accuracy. Fine linear coefficients derived  More>>
Authors:
Yukawa, K; Kijima, K [1] 
  1. Kyushu University, Fukuoka (Japan). Faculty of Engineering
Publication Date:
Oct 01, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98750999; CONF-9711147-
Reference Number:
SCA: 320204; 420400; 423000; 990200; PA: JP-97:0G4495; EDB-98:073746; SN: 98001944431
Resource Relation:
Conference: 95. meeting of the West Japan Society of Naval Architects, Seibu zosenkai dai 95 kai reikai ronbun kogai, Osaka (Japan), 14-15 Nov 1997; Other Information: PBD: 1 Oct 1997; Related Information: Is Part Of Summary of the papers of the 95th Meeting of the West Japan Society of Naval Architects. Joint meeting of three shipbuilding societies in fall, fiscal 1997; PB: 168 p.; Seibu Zosenkai dai 95 kai reikai ronbun gaiko. 1997 nendo shuki zosen sangakkai rengo koenkai
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; DRAG; HYDRODYNAMICS; SHIPS; NAVIGATION; BODY; FLUID MECHANICS; VORTICES; MATHEMATICAL MODELS; ATTENUATION; TIME DEPENDENCE; MOTION; WATER WAVES; POTENTIAL FLOW; BOUNDARY CONDITIONS; CONFORMAL MAPPING; DIFFERENTIAL CALCULUS; STABILITY
OSTI ID:
622783
Research Organizations:
West Japan Society of Naval Architects, Fukuoka (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98750999; TRN: JN97G4495
Availability:
Available from West Japan Society of Naval Architects, 10-1, Hakozaki 6-chome, Higashi-ku, Fukuoka-shi, Fukuoka, (Japan); OSTI as DE98750999
Submitting Site:
NEDO
Size:
pp. 43-48
Announcement Date:

Citation Formats

Yukawa, K, and Kijima, K. Study on estimating fluid force acting on a hull during maneuvering movement; Soju undoji no sentai ni sayosuru ryutairyoku no suitei ni kansuru kenkyu. Japan: N. p., 1997. Web.
Yukawa, K, & Kijima, K. Study on estimating fluid force acting on a hull during maneuvering movement; Soju undoji no sentai ni sayosuru ryutairyoku no suitei ni kansuru kenkyu. Japan.
Yukawa, K, and Kijima, K. 1997. "Study on estimating fluid force acting on a hull during maneuvering movement; Soju undoji no sentai ni sayosuru ryutairyoku no suitei ni kansuru kenkyu." Japan.
@misc{etde_622783,
title = {Study on estimating fluid force acting on a hull during maneuvering movement; Soju undoji no sentai ni sayosuru ryutairyoku no suitei ni kansuru kenkyu}
author = {Yukawa, K, and Kijima, K}
abstractNote = {With types of general cargo vessel and VLCC vessel as the object of discussion, a method was discussed to estimate fluid force acting theoretically on a hull during maneuvering movement, taking frame line shape into consideration. A vortex model was improved by giving consideration of time-based decay on intensity of discrete vortex lines based on the Rankine vortex. Modeling of flow fields around a hull was attempted to deal with movements in which width and draft are small as compared with the ship length, and turning angle speed and deviation angle are small. It was assumed that the ship speed is slow and effects of waves can be disregarded. Specular images of the hull were taken with regard to free surface, and handled as a double body model. Speed potential to express flow fields around a hull is required to satisfy the following five boundary conditions of Laplace, substance surface, free vortex layers, infinity and exfoliation. The potential may be handled as a two-dimensional problem in a field near the hull by using assumption of a slender and long body and conformal mapping. It was found possible to estimate hull fluid force with relatively good accuracy. Fine linear coefficients derived from the estimation were used to have performed highly accurate determination on course stabilization. 5 refs., 6 figs., 2 tabs.}
place = {Japan}
year = {1997}
month = {Oct}
}