An in-house large eddy simulation (LES) code has been developed in the previous study. In order to
validate the code for simulation of roll motion, effect of roll amplitude on forced roll damping is experimentally
investigated in a circulating water channel at Shanghai Jiao Tong University (SJTU). KRISO very large crude
carrier 2 (KVLCC2) is taken as a target ship, and a model with a scale of 1 : 128.77 is manufactured. Tests are
carried out for the ship model at shallow draft with frequencies around its natural roll frequency, where natural
roll frequency is attained via free roll decay. Six forced roll tests with roll amplitudes ranging from 1? to 4? are
performed experimentally, and three forced roll motions are simulated with the in-house LES code for middle
section of the ship model. Discrepancies between the computed roll damping coefficients and the ones from forced
roll tests are quite small. By means of particle image velocimetry (PIV), velocity fields in the vicinity of the
ship model, and generation and evolution of vortices near the ship bilge are measured in detail. It is shown that
roll amplitude has a significant effect on the vortex behavior, and therefore on the magnitude of roll damping
coefficient. Further experimental and numerical investigation into roll motions with large amplitudes is planned.
ZHANG Xiaohui (张晓慧), GU Xiechong (顾解忡), MA Ning (马宁), WANG Yifan (王一凡), WU Zeren (吴泽仁)
. Experimental Investigation into the Effect of Roll Amplitude on Roll Damping[J]. Journal of Shanghai Jiaotong University(Science), 2019
, 24(6)
: 732
-738
.
DOI: 10.1007/s12204-019-2120-4
[1] SOMAYAJULA A, FALZARANO J. Large-amplitudetime-domain simulation tool for marine and offshoremotion prediction [J]. Marine Systems & Ocean Technology,2015, 10(1): 1-17.
[2] SU Z Y, FALZARANO J M. Markov and Melnikovbased methods for vessel capsizing criteria [J]. OceanEngineering, 2013, 64(2): 146-152.
[3] DOWNIE M J, BEARMAN P W, GRAHAM J M R.Effect of vortex shedding on the coupled roll responseof bodies in waves [J]. Journal of Fluid Mechanics,1988, 189: 243-261.
[4] KORPUS R A, FALZARANO J M. Prediction of viscousship roll damping by unsteady Navier-Stokes techniques[J]. Journal of Offshore Mechanics and ArcticEngineering, 1997, 119(2): 108-113.
[5] BROWN D T, PATEL M H. A theory for vortex sheddingfrom the keels of marine vehicles [J]. Journal ofEngineering Mathematics, 1985, 19(4): 265-295.
[6] FROUDE W. On the influence of resistance upon therolling of ships [J]. Naval Science, 1972, 1: 411-429.
[7] IKEDA Y. A prediction method for ship roll damping[R]. Sakai, Japan: Department of Naval Architecture,Osaka Prefecture University, 19785.
[8] BASSLER C C, REED A M. An analysis of the bilgekeel roll damping component model [C]//10th InternationalConference on Stability of Ships and OceanVehicles. [s.l.]: STAB International Standing Committee,2009: 369-386.
[9] VUGTS J H. The hydrodynamic coefficients for swaying,heaving and rolling cylinders in a free surface[J]. International Shipbuilding Progress, 1968, 15(167):251-276.
[10] SPOUGE J R. Non-linear analysis of large-amplituderolling experiments [J]. International ShipbuildingProgress, 1988, 35(403): 271-320.
[11] YEUNG R W, LIAO S W, RODDIER D. On roll hydrodynamicsof rectangular cylinders [C]//Proceedingsof the Eighth (1998) International Offshore and PolarEngineering Conference. Montreal, Canada: TheInternational Society of Offshore and Polar Engineers,1998: 445-453.
[12] YEUNG R W. Fluid dynamics of finned bodies: FromVIV to FPSO [C]//Proceedings of The Twelfth (2002)International Offshore and Polar Engineering Conference.Kitakyushu, Japan: The International Society ofOffshore and Polar Engineers, 2002: 1-11.
[13] XU D J, ZHOU Q G, HONG W H, et al. The roll testallowing of deck into water [J]. Ship Building of China,1995(4): 29-36 (in Chinese).
[14] JUNG K H, CHANG K A, HUANG E T. Twodimensionalflow characteristics of wave interactionswith a free-rolling rectangular structure [J]. Ocean Engineering,2004, 32(1): 1-20.
[15] IRKAL M A R, NALLAYARASU S, BHATTACHARYYAS K. CFD approach to roll damping ofship with bilge keel with experimental validation [J].Applied Ocean Research, 2016, 55: 1-17.
[16] JUNG K H, CHANG K A, JO H J. Viscous effect onthe roll motion of a rectangular structure [J]. Journalof Engineering Mechanics, 2006, 132(2): 190-200.
[17] WANG X Q, LIU H X, MA S, GUO C. Investigationof the hydrodynamic model test of forced rolling for abarge using PIV [J]. Chinese Journal of Ship Research,2017, 12(2): 49-56 (in Chinese).
[18] ZHANG X H, BAI J L, GU X C, et al. Large eddy simulationof flows around a free surface piercing fixed 2Drectangle using a novel ghost-cell immersed boundarymethod [C]// Proceedings of the Twenty-Eighth (2018)International Ocean and Polar Engineering Conference.Sapporo, Japan: International Society of Offshoreand Polar Engineers, 2018: 614-621.
[19] ZHU D J. Study on ship maneuvering and rolling prediction and course-keeping control in waves [D]. Shanghai,China: Shanghai Jiao Tong University, 2015 (inChinese).
