This study seeks to explore the influence of water depth on the drag reduction effect and optimal drag reduction height of an interceptor. Based on the numerical solution approach of the RANS equations, the flow field around a high-speed monohull ship with various height interceptors is numerically simulated.

First, the validity of the numerical method is verified by a DTMB 5415 high-speed ship. Next, the flow field around a high-speed monohull ship is numerically simulated under different interceptor heights and water depths. Based on the numerical results, the resistance, navigation state and flow field characteristics under different working conditions are analyzed.

The results show that the drag reduction effect of the interceptor has an obvious shallow water effect. The optimal drag reduction height and reduction of trim angle of the interceptor is unchanged with the change in water depth. The interceptor has a certain effect on reducing wave-making behind the ship, but the effect decreases with the decrease in water depth.

This study has certain practical reference value for the application of interceptors in shallow water.