Calm Water Resistance Prediction and Navigation Posture Optimization of a New Unmanned Survey Catamaran

doi:10.16183/j.cnki.jsjtu.2022.452

Abstract

Abstract:

In order to obtain the resistance performance and economic navigation posture of a new unmanned survey catamaran, a calm water resistance simulation of this catamaran is conducted by model tests, the empirical formula method, and the computational fluid dynamics (CFD) method. Further, the CFD method is used to explore the influence of different longitudinal positions of the center of gravity on the hull and perimeter waveform, and a suitable installation position is selected for the multi-beam acoustic equipment. The results show that the CFD method can accurately predict the navigation posture and resistance at all speeds, while the empirical formula method is mainly suitable when the speed is low (Fr_Δ<1.5). At the speed of 4 and 6 kn, the economic navigation posture is at a tail tilt of 1.4°. At this time, there is a relatively stable high water level area between the pieces of about 0.3 to 0.5 times of vessel length from the stern, which can be used as a suitable installation position for multi-beam acoustic equipment.

Key words: resistance forecast, unmanned ship, catamaran, computational fluid dynamics(CFD), navigation posture

CLC Number:

CAI Junlei, YAO Tiancheng, LIU Hong, WAN Lijian, WAN Jun, FAN Xiang, ZHAO Yongsheng. Calm Water Resistance Prediction and Navigation Posture Optimization of a New Unmanned Survey Catamaran[J]. Journal of Shanghai Jiao Tong University, 2024, 58(2): 166-174.

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参数	实船值	船模值
船长,L/m	8	2
船宽,B/m	2.8	0.7
型深,D/m	1.1	0.275
吃水,d/m	0.51	0.127 5
排水质量,M/kg	4 441.6	69.4
长度缩尺比,λ	4∶1
速度缩尺比,λ_v	2∶1

类别	网格数×10^-4	阻力/N	与试验值的误差/%
粗糙网格	48.5	27.067 4	11.23
中等网格	112.6	28.080 0	7.90
细化网格	320.8	28.361 9	6.98
水池试验	—	30.490 0	—

工况	重心纵向位置 (距船尾)/m	航速/kn	备注
1	2.8	6	尾倾
2	3.2	6	尾倾
3	3.5	6	尾倾
4	3.6	6	尾倾
5	3.848	6	初始位置
6	4.0	6	首倾
7	4.4	6	首倾
8	4.7	6	首倾
9	4.8	6	首倾
10	5.2	6	首倾