On the fluid dynamic design and optimization of sailing yachts hull and appendages using a complete open source framework

Naval Architecture preserves both the sketching conceptualism and the engi- neering pragmatism. As a matter of fact, the heuristic approach behind a sailing yacht technology comes from a tangible amount of experience and knowledge. In this respect, Design and Analysis of Computer Experiments (DACE) represents an efficient tool for improving the overall knowledge on parameter dependency, while a Multi Objective Op- timization easily reveal the best choice according to specific project constraints. In this work we propose a fully automated and parametric simulation framework, entirely based on Open Source technology. From an engineering and practical point of view, it is im- portant to understand the real applicability of these tools on complex engineering tasks, such as evaluating the aero- and hydro-dynamic performance of sailing yachts. Due to its reliability, scalability and cost effectiveness, the use of a simulation and optimization framework based on Open Source software represents an attractive option for engineers and designers looking for the best return-of-investment. In order to create the parametric geometry we use SALOME and OpenVSP, while mesh generation and fluid dynamics simulation are based on OpenFOAM technology. The DACE optimization loop and the meta-models construction is done using DAKOTA. Finally, data analytics is done us- ing Python and JavaScript languages, allowing an interactive selections of data regions and/or single point in the design space. Results are shown in terms of Matrix Scatter Plot, Pearson’s Coefficient Correlation, Coordinates Plot and Pareto Frontier. As examples of possible applications, we present the optimization framework applied to a dagger-board, a bulb keel, a rigid sail and a sailing yacht hull