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Calculation of wave resistance by using Kochin function in the Rankine source method; Rankinsosuho ni okeru kochin kansu wo mochiita zoha teiko keisan

Abstract

In order to avoid negative wave resistance (which is physically incomprehensible) generated in calculating wave resistance by using the Rankine source method, a proposal was made on a wave resistance calculation method using the Kochin function which describes behavior of speed potential in regions far apart from a hull. The Baba`s condition was used as a free surface condition for the speed potential which expresses wave motions around a hull. This has allowed a new Kochin function which uses as unknown the speed potential on the hull surface and the free surface near the hull to be defined and combined with the Rankine source method. A comparison was made between the calculated values for wave resistance, hull subsidence and trim change of an ore transporting vessel (SR107 type of ship) in a fully loaded condition and the result of water tank tests. The wave resistance values derived from pressure integration have all become negative when the Froude number is from 0.1 to 0.2, while no negative resistance has appeared in the calculations by using the Kochin function, but the result has agreed with that of the water tank tests. Accuracy of the calculations at low speeds was improved. The trim  More>>
Authors:
Yasukawa, H [1] 
  1. Mitsubishi Heavy Industries, Ltd., Tokyo (Japan)
Publication Date:
Oct 01, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98750999; CONF-9711147-
Reference Number:
SCA: 320204; 420400; 423000; 990200; PA: JP-97:0G4490; EDB-98:073747; SN: 98001944426
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; SHIPS; HYDRODYNAMICS; DRAG; WAVE FORCES; NUMERICAL SOLUTION; WATER WAVES; MARITIME TRANSPORT; ORES; INCLINATION; PRESSURE DEPENDENCE; INTEGRALS; FROUDE NUMBER; SIMULATORS
OSTI ID:
622778
Research Organizations:
West Japan Society of Naval Architects, Fukuoka (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98750999; TRN: JN97G4490
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. 13-18
Announcement Date:
Jul 24, 1998

Citation Formats

Yasukawa, H. Calculation of wave resistance by using Kochin function in the Rankine source method; Rankinsosuho ni okeru kochin kansu wo mochiita zoha teiko keisan. Japan: N. p., 1997. Web.
Yasukawa, H. Calculation of wave resistance by using Kochin function in the Rankine source method; Rankinsosuho ni okeru kochin kansu wo mochiita zoha teiko keisan. Japan.
Yasukawa, H. 1997. "Calculation of wave resistance by using Kochin function in the Rankine source method; Rankinsosuho ni okeru kochin kansu wo mochiita zoha teiko keisan." Japan.
@misc{etde_622778,
title = {Calculation of wave resistance by using Kochin function in the Rankine source method; Rankinsosuho ni okeru kochin kansu wo mochiita zoha teiko keisan}
author = {Yasukawa, H}
abstractNote = {In order to avoid negative wave resistance (which is physically incomprehensible) generated in calculating wave resistance by using the Rankine source method, a proposal was made on a wave resistance calculation method using the Kochin function which describes behavior of speed potential in regions far apart from a hull. The Baba`s condition was used as a free surface condition for the speed potential which expresses wave motions around a hull. This has allowed a new Kochin function which uses as unknown the speed potential on the hull surface and the free surface near the hull to be defined and combined with the Rankine source method. A comparison was made between the calculated values for wave resistance, hull subsidence and trim change of an ore transporting vessel (SR107 type of ship) in a fully loaded condition and the result of water tank tests. The wave resistance values derived from pressure integration have all become negative when the Froude number is from 0.1 to 0.2, while no negative resistance has appeared in the calculations by using the Kochin function, but the result has agreed with that of the water tank tests. Accuracy of the calculations at low speeds was improved. The trim change in the calculations was slightly smaller than that in the water tank tests. The subsidence showed a good agreement. 7 refs., 1 fig.}
place = {Japan}
year = {1997}
month = {Oct}
}