Maneuvering Motion Modeling of Unconventional Ship Based on Numerical Calculation

doi:10.16183/j.cnki.jsjtu.2024.053

Abstract

Abstract:

To develop a maneuvering model for a typical unconventional ship, a decoupled modeling approach was adopted as the foundation to construct a numerical calculation based maneuvering model framework. To determine the hydrodynamic derivatives for the maneuvering model, static oblique towing test (OTT) and dynamic circular motion test (CMT) were performed by using numerical simulations to obtain the forces on ship body. To improve the accuracy of nonlinear hydrodynamic derivatives, a hybrid method combining cubic spline interpolation with least squares fitting was proposed. The zigzag and rotation tests of the scaled ship model verified the accuracy of the maneuvering model. The results show that the maneuvering motion model established by numerical calculation and the hybrid method has good accuracy and can be used for modeling unconventional ship maneuvering motion.

Key words: unconventional ship, ship maneuvering model, computational fluid dynamics (CFD), free running model test

CLC Number:

U663

ZHENG Mao, DING Shigan, LAN Jiafen. Maneuvering Motion Modeling of Unconventional Ship Based on Numerical Calculation[J]. Journal of Shanghai Jiao Tong University, 2025, 59(12): 1824-1836.

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参数	取值
参数	实船	船模
缩尺比, λ	50	1
L_PP/m	106.200	2.1240
B/m	16.600	0.332
d/m	3.100	0.062
菱形系数, C_P	0.675 8	0.675 8
C_b	0.654 5	0.654 5
排水体积, Δ/m³	3 595.6	0.028 8
S_R/m²	5.375	0.002 2
螺旋桨直径, D_P/m	2.16(4叶)	0.043 2(4叶)

试验	Fr	β/(°)	r'
OTT	0.195	±16,±8,±4,±2, ±1,±0.5,0	0
CMT	0.195	0	±0.2,±0.4,±0.6
CMT	0.195	-12,-8,-2,2,4,8,12	0.2,0.4,0.6

网格尺寸	网格数量×10^-6
网格尺寸	OTT	CMT
G₁	2.17	3.86
G₂	1.22	1.93
G₃	0.699	1.06

方法	T₁/s	T₂/s	T₃/s
OTT	0.01	0.02	0.04
CMT	0.01	0.02	0.04

参数	X'		Y'		N'
参数	压力	切应力	压力	切应力	压力	切应力
${S}_{{G}_{1}}$	-0.007 218	-0.023 95	0.027 91	0.001 876	0.016 23	-0.000 102 3
${S}_{{G}_{2}}$	-0.007 6	-0.023 87	0.027 86	0.001 849	0.017 34	-0.000 119 1
${S}_{{G}_{3}}$	-0.008 091	-0.023 78	0.028 98	0.001 724	0.017 82	-0.000 127 6
ε₂₁	5.289 1	-0.335 4	-0.185 4	-1.436 2	0.063 2	-0.843 6
ε₃₂	6.808 3	-0.409 1	3.999 4	-6.675 4	2.787	7.109 2
R_G	0.776 9	0.819 7	-0.046 36	0.215 1	0.022 68	-0.118 7
收敛性	Mon.	Mon.	Osc.	Mon.	Mon.	Osc.
P_G	0.728 5	0.573 5	0	4.433 2	10.925 3	0
${\delta }_{REG}^{*}$	18.415 9	-1.525 2	0	-0.393 7	0.001 5	0
${\delta }_{G}^{*}$	5.282	-0.335 4	0	-1.436 2	0.063 2	0
C_G	0.287 2	0.219 9	0	3.648	43.098 3	0
U_G	44.669 3	3.904 9	1.999 7	2.478 7	0.124 9	3.554 6