ABSTRACT
Keywords: Manoeuvring; PMM; CFD; BDR; Flat bottom vessel
International Maritime Organisation (IMO) has a stringent measure and policies to reduces the ship’s emission by 2050. For a flat bottom vessel, Bubble Drag Reduction (BDR) is an efficient method for achieving the emissions reduction by decreasing the frictional resistance of the vessel and it has a substantial effect on the hydrodynamic characteristics of the vessel also. There is a possibility of an adverse effect on the vessel’s performance in the event of incorrect prediction of the hydrodynamic forces and moments. While the subject has been researched extensively and many researchers are tackling the challenges of manoeuvring characteristics of the vessel, however it is being undertaken independently and the influence of BDR on the ship frictional resistance portion is being tackled separately. Therefore, it is prudent to explore the manoeuvrability of a flat bottom ship fitted with BDR technology by varying size of the hole 0.8mm, 1mm and 2mm and flow rates of 0.5 CFM to 3.0 CFD which forms the crux of this study and would include experimental as well as RANS equation based computational (CFD) methods. Quantifying the vessel's turning circle and zig-zag manoeuvring helps determine its manoeuvring characteristics through Planar Motion Mechanism (PMM) or a free running model test, which must also meet IMO standards. It is imperative that the sway force and yaw moment dependent hydrodynamic derivatives are projected and their affect by the way of BDR. Surge/drag force-dependent derivatives will be reduced by the BDR.