Development a optimization based methodology for high speed craft series

The way in which a marine vehicle can fulfill its expected functions is in case it has an underwater hull form compatible with its objective function. Providing this requires meticulous and complex analysis. Stability, resistance and maritime characteristics of a ship can only be achieved at a desired level as a result of a good ship design process. New alternatives have emerged in the design of ships, with the ever-present and often used conventional methods, along with developing digital systems. Keeping up with today's digital technology and benefit from this system can make the ship design much more efficient. Traditional methods are basically aimed at creating a ship form and evaluating it by analysis or experiments and providing the desired characteristics. Achieving the best is not the main objective. This is why experimental methods do not allow too much iteration in terms of cost and time. Also, there is no certainty of accuracy of analysis by empirical formulations for each hull type. The aim of this study is to develop a more efficient design methodology by keeping up with today's technological developments. By means of computer based simulations and analysis methods, an automated algorithm has been introduced to reach the best solution. In the application part of the methodology, high speed craft form characteristics have been studied. In this context, firstly the flow chart of the methodology is presented and a parametric model is created within the boundaries resulting from the preliminary design phase so that the system can operate automatically. With the help of determined design variables, 120 hull forms were derived by systematic variation and each of alternative hull forms was examined in terms of stability, seakeeping and resistance. Computational fluid dynamics software are used for seakeeping and resistance analysis. As a result of the analyses, the effect of the active parameters of the geometries with high speed form characteristics on performance was evaluated. Using an optimization method, an optimum form series has been demonstrated from 120 alternative hull forms for different displacement groups. Additionally, a formula was created by regression analysis of the results of hydrodynamic analyses made at different speeds in order to compare similar type hull forms in terms of resistance. In this study, an automatically operated methodology is presented. Optimization has been applied by using this methodology and as a result, an optimal series for planing hulls with a certain length and different displacement groups has been introduced. Keywords: Computational fluid Dynamics, multi-objective optimization, parametric modeling, systematic variation, hull series.