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In order to investigate the hydrodynamic performance of ships in restricted channel of polar regions, a hybrid Green’s function method based on three-dimensional potential flow theory was established, in which, the free-surface Green’s function was taken as the kernel function in the fluid domain of channel. The ice sheet on both sides of the channel was modeled as a thin elastic plate. The ice-surface Green’s function, which automatically satisfies the ice-covered water surface, seabed and radiation conditions, was adopted in the fluid domain below the ice. The boundary integral equations were established with the two kernel functions above respectively. To improve the efficiency of computation, the influence coefficients related to the wave component of the ice-surface Green’s function were obtained based on its analytical integral over vertical line segment. On the basis of above method, a computer program was developed. By taking a barge with available computational data as the research object, the effects of control surface length and mesh density on the convergence of calculation were first discussed, and the reliability of the method and program was verified. Then further calculations and analysis were conducted on the hydrodynamic coefficients under different channel widths and ice thicknesses. From the numerical results the oscillatory phenomenon was observed in the hydrodynamic forces of the ship in water channel confined by ice sheets. And with the decrease of channel width and increase of ice thickness, the oscillation becomes stronger.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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