Numerical Analysis of Wave Motion of Rigid Seals of Partial Air Cushion Support Catamaran

doi:10.12141/j.issn.1000-565X.210532

Abstract

Abstract:

Partial air cushion support catamaran (PACSCAT) is a new type of high-performance ship based on slender catamaran and supplemented by partial air-cushion support. Its bottom is flat and wide, and the air-cushion displacement volume accounts for about 30% of the whole ship. Due to the air cushion, the ship will have many nonlinear characteristics when sailing in the waves, influencing the motion performance of the hull heavily. The three-dimensional potential flow theory considers the three-dimensional effect of the flow field and it has been widely used in the field of ship hydrodynamics, so it can be effectively applied to the study of strong nonlinear motion characteristics of ships, which coincides with the study of nonlinear mechanics of hovercraft. The research was based on the rigid air seal form of the cushion system, and took into account the nonlinear characteristics of the air cushion. Therefore, in order to verify the form of numerical calculation method of PACSCAT with rigid seals, and study its movement characteristics in waves, this paper adopted the free surface method, and used overlapping grids and slip grids to analyze its performance in clam water. Furthermore, based on the best grid form, its navigation performance in regular waves was numerically simulated and compared with the experimental values, and then the calculation accuracy of the total hull resistance and the characteristics of the motion parameters under different wavelengths were studied. The results show that: overlapping grids have a higher hydrostatic resistance calculation accuracy than sliding grids, up to 5.2% when v=5.0 m/s. In the numerical calculation, the amplitude and average value of wave resistance are greater than the experimental value, and the error is the largest at the wavelength of 7.0 m. From the study of various wave motion parameters, it can be seen that there is no obvious difference between the duration curve of each motion parameter and the test value, and the calculated value of amplitude response is generally smaller than the experimental value, but the calculated value is obviously greater than the experimental value when λ/L is 2.33.

Key words: partial air cushion support catamaran, rigid seals, motion characteristics, overlapping grid, numerical analysis

CLC Number:

U661.3

YANG Jinglei, SUN Hanbing, LI Xiaowen, et al. Numerical Analysis of Wave Motion of Rigid Seals of Partial Air Cushion Support Catamaran[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(9): 69-77.

Figures/Tables 21

Fig.1

Table 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Table 2

Table 3

Table 4

Clam water performance calculation result at v=3.6 m/s"

序号	网格形式	R_exp/N	R_cal/N	$e = R c a l - R e x p R e x p / %$
C1	重叠网格	135.24	125.36	7.31
C2		135.24	126.49	6.47
C3		135.24	126.56	6.42
C4	滑移网格	135.24	124.34	8.06
C5		135.24	124.53	7.92
C6		135.24	124.72	7.78

Table 4

Table 5

Clam water performance calculation result at v=5.0 m/s"

序号	网格形式	R_exp/N	R_cal/N	$e = R c a l - R e x p R e x p / %$
D1	重叠网格	198.94	186.16	6.42
D2		198.94	188.34	5.33
D3		198.94	188.59	5.20
D4	滑移网格	198.94	183.31	7.86
D5		198.94	185.08	6.97
D6		198.94	185.86	6.58

Table 5

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

Fig. 14

Fig. 15

Fig. 16

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参数	数值
船长L/m	3
船宽B/m	0.7
垫升舱长L_C /m	2.6
片体宽B₁ /m	0.22
垫升舱宽B_C /m	0.26
连接桥高度H_C/m	0.16
排水量Δ/kg	145

序号	网格形式	第一层网格尺寸/m	y⁺	网格数量/万
C1	重叠网格	0.000 94	127.2	145.11
C2		0.001 17	158.3	137.53
C3		0.001 40	189.9	117.32
C4	滑移网格	0.000 94	127.2	137.72
C5		0.001 17	158.3	124.46
C6		0.001 40	189.9	105.21

序号	网格形式	第一层网格尺寸/m	y⁺	网格数量/万
D1	重叠网格	0.000 94	127.2	145.11
D2		0.001 17	158.3	137.53
D3		0.001 40	189.9	117.32
D4	滑移网格	0.000 94	127.2	137.72
D5		0.001 17	158.3	124.46
D6		0.001 40	189.9	105.21

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