dynamic analysis of multiple floating bodies

8/4/2019 Dynamic Analysis of Multiple Floating Bodies

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DYNAMIC ANALYSIS

OF MULTIPLEFLOATING BODIES

G vinod Kumar

M100420CE

Guided by

Dr A.P Shashikala


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OBJECTIVE:-

Finding out the hydrodynamic coefficients and

wave excitation force on two ships close to each

other by linear 3D panel method.

Response of the two ships in regular and multi

directional seas.

Estimation of optimum distance between thetwo ships by optimisation algorithm.

.


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Methodology:-


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Work in Progress:-


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Modelling:-


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Meshing:-


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Comparing ANSYS results with standard solution-


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Hydrodynamic Cofficents- (ship1)

PERIOD FREQ M11 M22 M33 M44 M55 M66 M13 M15 M24 M26 M35 M46

(SEC) (RAD/SEC) kg kg kg Kgm2 Kgm2 kgm2 kg kgm kgm kgm kgm kgm2

20 0.314 1.97E+05 1.68E+06 9.76E+06 2.72E+07 1.55E+09 3.04E+08 1.45E+05 1.38E+07 -3.08E+06 2.51E+06 2.36E+07 3.08E+0619 0.331 1.99E+05 1.69E+06 9.67E+06 2.72E+07 1.56E+09 3.05E+08 1.45E+05 1.39E+07 -3.11E+06 2.52E+06 2.34E+07 3.09E+0618 0.349 2.01E+05 1.71E+06 9.57E+06 2.73E+07 1.58E+09 3.06E+08 1.45E+05 1.41E+07 -3.13E+06 2.52E+06 2.32E+07 3.11E+0617 0.37 2.03E+05 1.73E+06 9.44E+06 2.74E+07 1.59E+09 3.08E+08 1.46E+05 1.43E+07 -3.17E+06 2.53E+06 2.30E+07 3.14E+0616 0.393 2.06E+05 1.75E+06 9.29E+06 2.75E+07 1.61E+09 3.10E+08 1.46E+05 1.45E+07 -3.21E+06 2.54E+06 2.27E+07 3.17E+0615 0.419 2.10E+05 1.78E+06 9.11E+06 2.76E+07 1.63E+09 3.12E+08 1.47E+05 1.47E+07 -3.26E+06 2.56E+06 2.24E+07 3.21E+0614 0.449 2.14E+05 1.81E+06 8.90E+06 2.77E+07 1.65E+09 3.16E+08 1.47E+05 1.50E+07 -3.32E+06 2.58E+06 2.20E+07 3.26E+0613 0.483 2.18E+05 1.85E+06 8.65E+06 2.79E+07 1.67E+09 3.20E+08 1.49E+05 1.54E+07 -3.40E+06 2.60E+06 2.15E+07 3.34E+0612 0.524 2.23E+05 1.91E+06 8.35E+06 2.81E+07 1.69E+09 3.26E+08 1.51E+05 1.57E+07 -3.50E+06 2.63E+06 2.09E+07 3.45E+0611 0.571 2.26E+05 1.99E+06 7.97E+06 2.84E+07 1.71E+09 3.35E+08 1.54E+05 1.59E+07 -3.64E+06 2.68E+06 2.02E+07 3.62E+0610 0.628 2.27E+05 2.10E+06 7.49E+06 2.87E+07 1.71E+09 3.48E+08 1.60E+05 1.59E+07 -3.83E+06 2.74E+06 1.92E+07 3.88E+069 0.698 2.23E+05 2.29E+06 6.86E+06 2.93E+07 1.67E+09 3.68E+08 1.68E+05 1.55E+07 -4.15E+06 2.84E+06 1.78E+07 4.29E+068 0.785 2.08E+05 2.69E+06 5.88E+06 3.06E+07 1.57E+09 4.03E+08 1.84E+05 1.43E+07 -4.83E+06 2.96E+06 1.57E+07 4.99E+067 0.898 1.75E+05 2.78E+06 1.74E+06 2.96E+07 1.37E+09 4.68E+08 2.09E+05 1.16E+07 -4.61E+06 1.93E+06 7.65E+06 8.44E+066 1.047 1.08E+05 5.17E+05 3.17E+06 2.17E+07 8.84E+08 4.41E+08 9.59E+04 5.45E+06 -3.18E+05 3.03E+06 8.31E+06 1.38E+065 1.257 1.43E+05 1.08E+06 4.12E+06 2.38E+07 9.48E+08 2.18E+08 1.40E+05 8.07E+06 -1.40E+06 3.23E+06 1.10E+07 -7.78E+054 1.571 6.33E+04 -8.14E+05 3.30E+06 2.26E+07 4.75E+08 -2.38E+08 1.45E+05 1.94E+06 3.12E+05 1.74E+06 9.07E+06 -6.44E+063 2.094 7.00E+04 -2.28E+05 4.11E+06 2.13E+07 8.47E+08 -3.05E+07 1.59E+05 5.40E+06 -4.47E+05 2.57E+06 1.02E+07 4.46E+052 3.142 6.46E+04 6.38E+05 4.76E+06 2.31E+07 9.46E+08 1.15E+08 1.51E+05 5.90E+06 -1.12E+06 1.89E+05 1.14E+07 1.54E+06


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Hydrodynamic Cofficents- (ship2)

PERIOD FREQ M11 M22 M33 M44 M55 M66 M13 M15 M24 M26 M35 M46

(SEC) (RAD/SEC) kg kg kg Kgm2 Kgm2 kgm2 kg kgm kgm kgm kgm kgm2

20 0.314 1.97E+05 1.68E+06 9.76E+06 2.72E+07 1.55E+09 3.04E+08 1.45E+05 1.38E+07 -3.08E+06 2.51E+06 2.36E+07 3.08E+0619 0.331 1.99E+05 1.69E+06 9.67E+06 2.72E+07 1.56E+09 3.05E+08 1.45E+05 1.39E+07 -3.11E+06 2.52E+06 2.34E+07 3.09E+0618 0.349 2.01E+05 1.71E+06 9.57E+06 2.73E+07 1.58E+09 3.06E+08 1.45E+05 1.41E+07 -3.13E+06 2.52E+06 2.32E+07 3.11E+0617 0.37 2.03E+05 1.73E+06 9.44E+06 2.74E+07 1.59E+09 3.08E+08 1.46E+05 1.43E+07 -3.17E+06 2.53E+06 2.30E+07 3.14E+0616 0.393 2.06E+05 1.75E+06 9.29E+06 2.75E+07 1.61E+09 3.10E+08 1.46E+05 1.45E+07 -3.21E+06 2.54E+06 2.27E+07 3.17E+0615 0.419 2.10E+05 1.78E+06 9.11E+06 2.76E+07 1.63E+09 3.12E+08 1.47E+05 1.47E+07 -3.26E+06 2.56E+06 2.24E+07 3.21E+0614 0.449 2.14E+05 1.81E+06 8.90E+06 2.77E+07 1.65E+09 3.16E+08 1.47E+05 1.50E+07 -3.32E+06 2.58E+06 2.20E+07 3.26E+0613 0.483 2.18E+05 1.85E+06 8.65E+06 2.79E+07 1.67E+09 3.20E+08 1.49E+05 1.54E+07 -3.40E+06 2.60E+06 2.15E+07 3.34E+0612 0.524 2.23E+05 1.91E+06 8.35E+06 2.81E+07 1.69E+09 3.26E+08 1.51E+05 1.57E+07 -3.50E+06 2.63E+06 2.09E+07 3.45E+0611 0.571 2.26E+05 1.99E+06 7.97E+06 2.84E+07 1.71E+09 3.35E+08 1.54E+05 1.59E+07 -3.64E+06 2.68E+06 2.02E+07 3.62E+0610 0.628 2.27E+05 2.10E+06 7.49E+06 2.87E+07 1.71E+09 3.48E+08 1.60E+05 1.59E+07 -3.83E+06 2.74E+06 1.92E+07 3.88E+069 0.698 2.23E+05 2.29E+06 6.86E+06 2.93E+07 1.67E+09 3.68E+08 1.68E+05 1.55E+07 -4.15E+06 2.84E+06 1.78E+07 4.29E+068 0.785 2.08E+05 2.69E+06 5.88E+06 3.06E+07 1.57E+09 4.03E+08 1.84E+05 1.43E+07 -4.83E+06 2.96E+06 1.57E+07 4.99E+067 0.898 1.75E+05 2.78E+06 1.74E+06 2.96E+07 1.37E+09 4.68E+08 2.09E+05 1.16E+07 -4.61E+06 1.91E+06 7.66E+06 8.47E+066 1.047 1.08E+05 5.17E+05 3.17E+06 2.18E+07 8.84E+08 4.41E+08 9.59E+04 5.45E+06 -3.17E+05 3.03E+06 8.31E+06 1.37E+065 1.257 1.43E+05 1.08E+06 4.12E+06 2.38E+07 9.48E+08 2.18E+08 1.40E+05 8.08E+06 -1.40E+06 3.23E+06 1.10E+07 -7.78E+054 1.571 6.33E+04 -8.14E+05 3.30E+06 2.26E+07 4.75E+08 -2.38E+08 1.45E+05 1.94E+06 3.11E+05 1.74E+06 9.07E+06 -6.42E+063 2.094 7.00E+04 -2.28E+05 4.11E+06 2.13E+07 8.47E+08 -3.06E+07 1.59E+05 5.40E+06 -4.47E+05 2.57E+06 1.02E+07 4.35E+052 3.142 6.46E+04 6.38E+05 4.76E+06 2.32E+07 9.46E+08 1.15E+08 1.51E+05 5.90E+06 -1.12E+06 1.97E+05 1.14E+07 1.54E+06


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Pressure


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Response :-


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References:-

B.J.Koo, Hydrodynamic interactions and relative motions of two floating

platforms, Applied Ocean Research, pp 292-310, 2005.

Y.Gou&B.Teng, On Research on Hydrodynamic interaction between Multiple

Floating Bodies, 2006.

ZHU Ren-chuan, The Radiation problem of Multiple Structures with small

gaps in between, 2005.

S.K Chakrabarti, Response due to moored multiple structure interaction,

Marine Structures, pp 231-258.


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J.N Newman., Efficient hydrodynamic analysis of very large floating

structures, Marine Structures, pp 169-180, 2005.

Gung-Rong Chen & Ming-Chung Fang; Hydrodynamic interactions

between two ships advancing in waves, Ocean Engineering, pp 1053-

1078, 2000.

dynamic analysis of multiple floating bodies

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