A genetic algorithm (GA) based optimization technique is used in combination with boundary element method. Firstly, the boundary element method is applied to analyze the hydrofoil for a wide range of angles of attack, aspect ratios, and maximum camber and thickness ratios assuming that the thickness and camber distributions of hydrofoil section are given. Then the lift, drag and other parameters involved in the imposed constraints are approximated by the second-degree polynomial functions of angle of attack, aspect ratio and maximum camber and thickness ratios. The coefficients of these polynomials are solved by the method of least squares using the information provided by the analysis method. The optimization algorithm is then used to search for an improved geometry of the hydrofoil of minimum drag satisfying all of the specified requirements.

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The efficient and effective design of complex engineering structures, such as marine vessels, presents the designer with a considerable challenge. This challenge is due to a large number of coupled decisions, which are required to be made concurrently. To assist designers in making better decisions, we call for a shift from the traditional sequential design spiral and basis-ship philosophy towards a concurrent approach to design.

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