3-dimensional motion simulation of a ship in waves using composite grid method
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- Βακχος Αξιώτης
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1 1 E dimensional motion simulation of a ship in waves using composite grid method matsuo@triton.naoe.t.u-tokyo.ac.jp, park@triton.naoe.t.u-tokyo.ac.jp, sato@triton.naoe.t.u-tokyo.ac.jp, miyata@triton.naoe.t.u-tokyo.ac.jp, 7-3-1, Hiroshi Matsuo, J.C.Park, Toru Sato, and Hideaki Miyata Dept. of Environmental and Ocean Engineering, Univ. of Tokyo, Hongo Bunkyo-ku Tokyo Japan In this study, a computational fluid dynamics simulation technique has been developed for unsteady motion of a ship advancing in waves. Composite grid system is employed in order to deal with large amplitude motions of ship and wave generation separately. The governing equations, Navier-Stokes (N-S) and continuity equations, are discretized by a finite volume method, in the framework of inner grid (O-H type) and outer grid(rectangular) systems. The present method is applied to simulate flow around ship heading on calm water and in forced motions. Wave maker is also tested. The results show that composite grid can cope with 6 D.O.F motion of ship and wave maker. CFD Yaw Navier-Stokes N S (1) (1) 1 (1) K (2) (3) (2) (3) MAC O-H Fig SOR 1 Table Fig.2 Copyright 21 by JSCFD
2 Table.2 Series 6 model Block Coefficient Cb.6 Midship Section Coefficient Cm.9775 Length-breadth ratio Lpp/ B 7.5 Length between pp L [m] 1 Breadth B [m].1333 Draught T [m].533 Wetted surface S [m2].1699 Volume of displacement [m3] Table.3 Condition of calculation for steadily heading ship Grid Points Inner = Fig 1 composite grid system Table.1 Simulation Methods Governing Eq.. -S & Continuity Eqs. Algorism MAC Differencing Time Euler Differencing Space 3rd order upstream(advection term), 2nd order centered (others) Variables Arrangement Staggered Mesh Turbulent Model Dynamic SGS model Free surface condition Marker Density Function (DFM) method Inner grid FluidBody fixed coordinate system Ship motionground fixed coordinate Outer grid FluidOuter grid is fixed on the center of gravity without any rotating motionsno Rotate Minimum grid space.1 Reynolds Number Froude number.316 Dt.1 Time of acceleration 3. Frame 1 4 Dec E-5 Friction Pressure tim e Fig.3 Time history of resistance ().2 ζ.1 Mono grid Experiment Overset grid N1= ( 1 - a1 ) ( 1 - a2 ) N2= a1 ( ( 1 - a2 ) N3= a1 a2 N4= ( 1 - a1 ) a Fig.4 Wave elevation on Series6 hull Fig2 Interpolation Coefficient Series6 Table.2 Table.3 Fig.3 Fig.4 Fig.4 Fig.5 Pressure contour at section=1.5 2 Copyright 21 by JSCFD
3 6 Roll Roll, Yaw Surge, Sway Heave, Pitch RollPitchYaw Roll Roll2 Roll Table.4 Fig.6 Fig.11 Fig.7 Grid distribution at section=1.5. Roll amplitude is 2 degree. Table.4 Condition of calculation for enforced roll motion simulation Grid Points Inner = Minimum grid space.1 Reynolds Number Froude number.316 Dt.1 Time of acceleration 3. Roll angle 2 Period of Rolling 2. Fig.7 Pressure contour at section=1.5. Fn=.316 Frame 1 13 Dec 21.4 Total resistance Pressure Friction Fig.6 Time history of resistance. Fn=.316 Fig.1 Grid distribution on horizontal plane. Frame 1 11 Dec 21.2 Mx My Mz Fig.7 Time history of moment. Fn=.316 Fig.11 Instantaneous wave height contour map 3 Copyright 21 by JSCFD
4 Yaw Roll Roll Roll Roll Yaw Roll Yaw Roll 1Yaw 5 Table.5 Roll Yaw Fig.12 Fig.1316 Table.5 Condition of calculation for enforced roll and yaw motion Grid Points Inner = Frame 1 11 Dec Mx My Mz Fig.14 Time history of moment. Fn=.24 Roll amplitude is 1 degree. Yaw amplitude is 5. Minimum grid space.1 Reynolds Number Froude number.24 Dt.1 Time of acceleration 3. Roll angle 1 Yaw angle 5. Period of Rotation 2. Frame 1 11 Dec Degree Roll angle Yaw angle Fig15 Pressure contour at Section=1.. Fn=.24 Roll amplitude is 1 degree. Yaw amplitude is 5 degree Fig.12 Time history of Roll and Yaw angle. Fn=.24 Frame 1 11 Dec Fx(pressure) Fy(pressure) Fig.16 Pressure contour at section=6.. Fn=.24 Roll amplitude is 1 degree. Yaw amplitude is 5 degree 5 1 Fig.13 Time history of Fx Fy. Fn=.24. Roll amplitude is 1 degree. Pitch amplitude is 5. 4 Copyright 21 by JSCFD
5 Surge Sway Surge Sway 2 Surge 1Sway 12 Table.6 Fig.17 X Sway Fig.182 Table.6 Condition of calculation for forced Surge and Sway simulation Grid Points Inner = Minimum grid space.1 Reynolds Number Froude number.24 Dt.1 Time of acceleration 3. Amplitude of Surge.1 Amplitude of Sway.12 Period of oscillation 2. Frame 1 11 Dec 21 Mx My.2 Mz Fig.19 Time history of moment. Fn=.24 Roll amplitude is 1 degree. Pitch amplitude is 5. Frame 1 11 Dec21.2 Surge Sway Fig.2 Pressure contour at section= Fig.17 Time history of enforced surge and sway velocity. Fn=.24 Frame 1 11 Dec 21.6 Fx (pressure) Fy (pressure) Fig.18 Time history of Fx and Fy. (Pressure) Fig.21 Instantaneous wave height contour map 5 Copyright 21 by JSCFD
6 Heave Pitch Heave Pitch Table. Fig.2224 Table.7 Condition of calculation for heave and pitch motion Grid Points Inner = Minimum grid space.1 Reynolds Number Froude number.24 Dt.1 Time of acceleration 3 Amplitude of Heave.6 Amplitude of Pitch 1.5degree Period of oscillation 1 Frame 1 14 Dec 21 Park et al (11) (12) Table. Fig.25,26 Fig Table.8 Condition of calculation for mechanical wave generating simulation Grid Points Inner = Minimum grid space.1 Reynolds Number Dt.1 Wave Length 1.1 Wave Height Fig.22 Time history of resistance due to pressure. A B Frame 1 14 Dec Fig.25 Instantaneous wave height contour Fig.23 Time history of My(pitching) moment. Fram e 1 9 Nov Fig.24 Pressure contour on hull surface. Pitch= tim e Fig.26 Time history of wave height at point A and B in Fig.25 Copyright 21 by JSCFD
7 CFD 1) Aerodynamics of High Speed Trains Passing by Each other Kozo Fujii and Takanobu OGAWA 2) ) Chimera RANS Simulation of Nonlinear Waves Induced by a Heaving Cylinder PRAHORO YULIJANTO NURTJAHYO, TEXAS A&M University 4) B-Spline Method and Zonal Grids for Simulations of Complex Turbulent Flows Journal of Computational Physics 1999 G.Kravchenko, Parvis Moin and Karim Shariff 5) 3 CFD ) CFD 2 7) CFD ) ) ) 14 11) Jong-Chun Park, Ming Zhu, Hideaki Miyata : On the Accuracy of Numerical Wave Making Techniques, J. Soc. Naval Arch. Japan, Vol. 173, pp (1993) 12) Jong-Chun Park, Hideaki Miyata, : Numerical Simulation of the 2D and 3D Breaking Waves by Finite-Difference Method., J. Soc. Naval Arch. Japan, Vol. 175, pp (1994) 7 Copyright 21 by JSCFD
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