关键词: 船舶工程； 丁坝；水动力特性；数值模拟；限制水域；浅水

Abstract: Spur dike is a common hydraulic structure, which will affect the flow of river and the hydrodynamic characteristics of passing ships. Based on the RANS equation, VOF method was used to process free surface, and Realizable k-ε turbulence model was combined to numerically simulate the hydrodynamic characteristics of ships passing through spur dike. Firstly, the hydrodynamic characteristics of the spur dike and the ship were numerically simulated and compared with the experimental data, which proved the rationality of the numerical simulation method. Then, the flow velocity and the relative position of the ship spur dike were used as the variation parameters to calculate the hydrodynamic characteristics of the ship and the channel flow field domain, and the force characteristics of the ship and the variation pattern of the navigation attitude were obtained. The results show that the presence of ships makes the flow field behind the spur dike oscillate unsteadily. When the ship passes through the spur dike, the peak value of transverse force appears at about 0.25 times of the ship length in front of the spur dike (X/Lpp=-0.25), the peak value of longitudinal force appears at the position of the axis of the spur dike. The positive peak value of heading turning moment appears at the position of 0.5 times of the ship length behind the spur dike (=0.5), and the negative peak value appears at the position of 0.5 times of the ship length in front of spur dike (X/Lpp=-0.5). With the increase of water flow velocity, the increment of force and moment of ship is the most significant in the range of one ship length in front and rear of the spur dike (-1

Key words: ship engineering; spur dike; hydrodynamic characteristics; numerical simulation; confined water; shallow water