Abstract:Currently,there is no unified standard for the design of intermediate channels and the canals connecting major water systems in high dam navigation.The navigation of vessels within these channels is significantly different from that in open water areas.This paper takes the representative ship type of 3,000-ton-class bulk carrier in inland waterway class I as the research object.The method of three-dimensional numerical simulation of fluid-solid coupling combined with the experimental validation of the resistance test of circulating flume ship model is used to study the influence of shallow water effect on the navigational parameters of the ship under static water conditions in a channel of twice the width of the ship,with h/T（water depth to draft ratio)=1.2,1.3,1.5,2.0 and 2.5,and speeds ranging from 1.0 to 3.0 m/s,with a step size of 0.5 m/s for combined working conditions.The research results show that when h/T is less than 1.5 times and speed is greater than 2.0 m/s,the water level difference between the bow and stern of the ship increases significantly,the specific drop of water surface increases,and the longitudinal force increases significantly,resulting in an increase in the total resistance of the ship’s navigation.In addition,as the speed increases,the flow velocity around the ship increases,the water level and hydrostatic pressure around the ship decreases,and the hydrostatic pressure at the transom is lower than that in the bow area.The degree of sinking and longitudinal inclination of the ship intensifies,ultimately leading to a further increase in the total resistance of the ship.The results of this research can provide important references for the design of water depth of intermediate channels or canal channels and the determination of safe navigation speed of ships.
