Numerical Prediction of Pressure Fluctuation Included by Propeller on Hull Surface

Abstract

In this paper, the DDES delayed separated vortex model is used to simulate the propeller excitation force of a pod, and the three-dimensional vortex structure characteristics and the propeller induced excitation force characteristics under the coupling effect of the hull pod are obtained. The calculation results show that the main characteristic frequencies of the pressure fluctuation on the surface of the pod are axial frequency and blade frequency, and there are four times of axial frequency at some measuring points. The leading edge of the davit and the propeller jet will have a strong interference effect, resulting in high blade frequency amplitude at the blade radius of the leading edge of the davit. The optimization of the davit structure is an effective way to reduce the induced excitation force of the pod propeller.