CFD Analysis of Resistance Characteristics of High-Speed Displacement Hull Forms fitted with Hull Vane®
Avala, Venkata Karthik
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Improving the performance and resistance of a high-speed monohull forms has been of interest to Naval Architects for several decades. A considerable amount of research has been carried out in this area by using stern flaps and other appendages. This research thesis investigates the resistance characteristics of high-speed round bilge hull forms fitted with a Hull Vane® in the stern region of the vessel. The Hull Vane® is a fixed foil located below the waterline at the aft of the stern of the vessel. The Hull Vane® reduces the generation of waves at the aft and improves the vessel's motions. This thesis investigates the drag reduction by fitting a Hull Vane® in the stern region of a select few of Australian Maritime Engineering Cooperative Research Center (AMECRC) systematic series hull forms, originally developed as High-Speed Displacement Hull Forms (HSDHF) series at MARIN, The Netherlands. The aim of this research is to: - Validate the total resistance of AMECRC series models #3, #4, #8, #11, #13 for the Froude numbers 0.5, 0.6, 0.7 in CFD against the experimental data available. - Attach a Hull Vane® of NACA 4412 profile at the aft region of the above hull forms at the same Froude numbers and determine reduction in resistance if any. Hull Vane® used for this analysis has a profile similar to NACA 4412 and principal dimensions such as span has been varied according to the breadth of the models tested. The flap angle and chord length have been kept constant. The CFD research is carried out on STAR CCM+, a CFD package used to simulate the drag characteristics. Models #8, #11 and #13 have shown a significant reduction in the total resistance varying from 7% to 29% with an average reduction of 17.3% when fitted with a Hull Vane® . Model #3 and #4 did not show any significant improvement in the resistance. In fact, model #4 has shown an increase in resistance when fitted with a Hull Vane® . It is expected that the results of this research would hopefully lay the ground work for further studies and comparative analysis. The conclusions would be beneficial for anyone interested in the Hull Vane® research.