Comparative analysis of the hydrodynamic performance of untwisted and twisted rudders using a hybrid RANSE/BEM model

摘要

Results of a computational study on the hydrodynamic performancernof twisted and untwisted rudders for a single screw vesselrnare presented. Ship flow simulations are performed by using arnhybrid RANSE/BEM model. Numerical predictions by RANSErnand BEM solvers are validated through comparisons against experimentalrndata for the ship considered in the study. The comparativernanalysis of untwisted and twisted rudders is carried outrnby fully–appended ship flow simulations at uniform ship speedrnand rudder angles between 0 and 20 degrees. Numerical resultsrnpredict comparable manoeuvring capabilities for the alternativernlayouts, whereas the twisted design allows to mitigate negativernpressure peaks observed on the untwisted rudder surface over arnrange of helm angles.