Author/Authors :
Budiartoa, U Department of Naval Architecture - Faculty of Engineering - University of Diponegoro, Semarang, Indonesia , Samuel, S Department of Naval Architecture - Faculty of Engineering - University of Diponegoro, Semarang, Indonesia , Wijayaa, A. A Department of Naval Architecture - Faculty of Engineering - University of Diponegoro, Semarang, Indonesia , Yuliantia, S Department of Naval Architecture - Faculty of Engineering - University of Diponegoro, Semarang, Indonesia , Kiryantoa, K Department of Naval Architecture - Faculty of Engineering - University of Diponegoro, Semarang, Indonesia , Iqbalb, M Department of Naval Architecture - Ocean and Marine Engineering - University of Strathclyde, Glasgow, UK
Abstract :
Drag is one of the main factors in improving fuel efficiency. Various study in regards to improve drag
performance of a planing hull amongst them is a stern flap. The main parameters to design a stern flap
are span length and angle of stern flap. The stern flap works by changing pressure distribution over the
ship's bottom and creating a lift force on the stern transom part. This study aims to analyze the
behavior of stern flap in variations of span length and angle of stern flap towards drag performance of
Fridsma hull form. Finite Volume Method (FVM) and Reynolds-Averaged Navier - Stokes (RANS)
are used to predict the hull resistance during simulations. Results show that shear drag is very sensitive
towards the total drag value, proving that shear drag valued at least 60% of the total drag in each
planing hull multi-phase characteristics phase. Stern flap with 58% of hull breadth span length installed
at 0° is considered the most optimal, reducing 10.2% of total drag, followed by 18% displacement
reduction. In conclusion, the stern flap effectively improves the Fridsma hull’s total drag and its
components on 0.89 < Fr < 1.89.
Keywords :
Drag , Stern Flap , Planing Hull , Finite Volume , Shear Force , Lift Force
