Comparative Test of Characteristics of Vortex-Induced Motion and Galloping of Classic Spar Platform

doi:10.16183/j.cnki.jsjtu.2020.206

Abstract

Abstract:

In order to study the characteristics of vortex-induced motion and galloping of the classic Spar platform, a model test with a mooring system is conducted in basin. The sway motion characteristics of the Spar platform at different current velocities are analyzed. By comparing the results in currents, waves, and wave-current coupled conditions, the coupling effects of current and wave on vortex-induced motion and galloping of the Spar platform are also studied. The results show that galloping is induced by the currents with high reduced velocities. Compared with the vortex-induced motion, the galloping phenomenon has a longer period, larger amplitude, and randomness. The coupling of current and wave would not change the mode of flow-induced motion, but it significantly affects the motion amplitude.

Key words: Spar platform, vortex-induced motion, galloping, model test, hydrodynamics of marine engineering

CLC Number:

P751

ZHANG Chenya, KOU Yufeng, LÜ Haining, XIAO Longfei, LIU Mingyue. Comparative Test of Characteristics of Vortex-Induced Motion and Galloping of Classic Spar Platform[J]. Journal of Shanghai Jiao Tong University, 2021, 55(5): 497-504.

Figures/Tables 13

Fig.1

Tab.1

Fig.2

Fig.3

Tab.2

Fig.4

Fig.5

Tab.3

Response amplitudes of Spar platform in currents

U_r	横荡		纵荡
U_r	$A D max$	$A D nom$	$A D max$	$A D nom$
9.3	0.0948	0.0490	0.0749	0.0291
22.8	0.4914	0.2526	0.2535	0.1224
25.6	0.5109	0.2783	0.2089	0.0899

Tab.3

Fig.6

Tab.4

Sway amplitudes in 1-year current, wave, and wave-current coupled condition

工况	横荡
工况	$A D max$	$A D nom$
流(V_c=0.73 m/s)	0.0948	0.0490
波浪(H_s=8.7 m)	0.0760	0.0365
波流耦合(H_s=8.7 m, V_c=0.73 m/s)	0.2071	0.1124

Tab.4

Fig.7

Tab.5

Sway amplitudes in current, wave, and wave-current coupled condition of rough sea state

工况		横荡
工况		$A D max$	$A D nom$
百年一遇	流(V_c=1.79 m/s)	0.4914	0.2526
	波浪(H_s=15 m)	0.1156	0.0568
	波流耦合(H_s=15 m, V_c=1.79 m/s)	1.1292	0.6111
千年一遇	流(V_c=2.01 m/s)	0.5109	0.2783
	波浪(H_s=18 m)	0.1518	0.0608
	波流耦合(H_s=18 m, V_c=2.01 m/s)	1.5295	0.6089

Tab.5

Fig.8

References 14

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参数	实际值	模型值
直径/m	34.1	0.568
中央井尺寸/m	12.8	0.213
螺旋侧板高度/m	4.44	0.074
吃水/m	198.1	3.302
干舷/m	16.8	0.280
立柱总高度/m	214.9	3.582
总排水量/t	174598	0.7886
垂向重心高度/m	87.78	1.463
横摇惯性半径/m	75.1	1.252
纵摇惯性半径/m	75.2	1.253
首摇惯性半径/m	16.8	0.280

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