A numerical study on the flow characteristics around a horn rudder operating in the wake of ship hull and propeller

초록

Many unsolved problems may occur in building large vessels. A typical issue at present is that a low speed ship has difficulty in keeping proper control ability during navigation because its rudder may not generate enough lifting force. For this reason, the necessity of high lifting rudder has increased to ensure the control ability needed for efficient navigation. The studies of rudder performance in the past are mostly performed only for rudders based on numerical simulations. Therefore, it is difficult to utilize the flow data around the rudder obtained from earlier studies, since a rudder is subjected to be positioned behind a hull with propeller. The present study investigates the variation of flow characteristics around the rudder located in a more realistic situation of hull-propeller-rudder combination. In this research, numerical simulations are performed using the model of a real ship. Numerical results are compared with some experimental results. The experimental results are obtained from the tests under the same condition of hull-propeller-rudder combination. In addition, the cavitation phenomenon on the rudder surface is simulated. The numerical simulations introduced in the present research are expected to be used effectively in designing high lifting rudders for low speed ships.