The Effect Of Interceptor And Stern Flap On The Resistance Of Planning Boat

To human being, the exploitation of ocean in21th century will be further development.In the ocean, there is plenty of resource which has become less day by day on land. Ship andocean engineering will be much more important than ever before. Planing boat is a maturetype of ship and is being widely used in both military and civil engineering. Researchers arealways searching for better optimized ship types and techniques to reduce the resistance andobtain better hydrodynamic performance. Interceptor and stern flap can effectively improvethe hydrodynamic performance of Planing boat. Making reasonable utilization of these twoappendages can improve the flow field around the ship and improve performance of resistance,propulsion and sea-keeping of the planing boat.The size of interceptor and stern flap is relatively small compared to the hull. Numericalsimulation by CFD method requires the mesh suitable to planing boat. Thereby, the Numericalsimulation can reflect the change of resistance before and after installing the appendages. Themethod of mesh discretization needs to be investigated, which is done in this paper. Theheight of the first layer mesh and the transition between the two layers of mesh are tested andanalyzed. Several griddings are formed on which the calculation of resistance are formed. Bycomparing of the results of numerical simulation and experiment, the relevant method ofgridding division is determined.Turbulence model is one of the principal factors in viscous CFD. In this paper, sevendifferent turbulence models are investigated and their influence on resistance calculation isanalyzed. By comparing with the experiment result, the most suitable turbulence model forplanning boat is determined. The type of turbulence model is selected in subsequentcalculations and the results of calculated drag for different speeds appear satisfactory. Thereliability of turbulence model and the research method is verified.The hydrodynamic mechanisms of Interceptor and stern flap are utterly different. In thispaper, the Interceptor is simplified and a two dimensional plate with Interceptor is assumed inthe preliminary numerical investigation. Then, the resistances of planing boat with andwithout Interceptor are compared in detail. The research on hydrodynamic mechanism ofstern flap start was developed earlier and has become somewhat mature. By comparing the results from numerical simulation and experiment, the size of Interceptor and stern flap whichcan effectively reduce resistance are determined, which might provide reference for laterresearch. In the whole work, a variety of resistance of planing boat is calculated. Bycomparing the calculation result and experiment data, the result is persuasive.