20 CAD/CFD統合型高効率最適化システムの構築とその検証 : 2次元翼型の最適化による最適化システムの検証

概要

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The present study developed a CFD based hydrodynamic shape optimization system which contains CAD based shape representation module and high performance optimization module. The sequential quadratic programming (SQP) is employed for the optimization algorism and the adjoint variable method adopted for the sensitivity analysis. The sensitivity analysis with the adjoint variable method shortens the much amount of computation time for the optimization compared with finite difference based sensitivity analysis; additionally the results of the sensitivity analysis with adjoint variable method have less grid dependency than that with finite difference based sensitivity analysis. This optimization system is applied for the optimization problem to maximize the lift-drag ratio of a two-dimensional foil shape which is represented with 12 control points under the constrained condition that foil sectional area is constant. The lift-drag ratio of the optimal foil shape is more than 50% larger than initial foil shape and all the constrained conditions are maintained. The influence of the initial shape on the optimal shape is also investigated. The initial value dependency is not so heavy and similar solutions are obtained. By this means the present optimization system is considered useful for the hydrodynamic shape design.
社団法人日本船舶海洋工学会の論文