Numerical Simulation of the effect of hull FIN on stern flow and the improvement of propulsion performance

Abstract

　In this study, the applicability of CFD to the design of the optimal arrangement of hull FIN, which is one of the energy-saving devices, was investigated. Considering the calculation environment at the design site of a shipyard, CFD with overset grid approach was applied because it is possible to maintain the accuracy for estimating the energy-saving effect with a small number of grids. The hull FIN is attached to the JBC hull form, and the effect of the installation position in the front/rear and vertical directions on the energy-saving effect was investigated. As a result, it was found that the main reason for the performance improvement by the hull FIN was the wake gain by moving the position of the stern vortex to the outer circumference of the propeller circle. From this, it was also shown that this method is effective for understanding the performance improvement mechanism of energy-saving devices.