ABSTRACT

A CFD-based adjoint solver tool is presented to modify the hullform of a trimaran ship. Cost function of optimization process is considered total for resistance of trimaran at cruise speed. Mesh sensitivity gives sensitivity of the cost function associated with mesh deformation. Mesh morphing tool is implemented to alter the geometry without the need to revisit the CAD environment. The position of mesh morphing's control points are the design variables used in the optimization process. The aim of this optimization is to demonstrate the limitations and capabilities of the mesh morphing adjoint-based method for hydrodynamic complex geometries. Based on the numerical findings, a 6.67% reduction in total resistance of the trimaran is observed in a limited number of iterations. Meanwhile, major modification is observed on the side hull. Development of a CFD-based optimization platform with less computational time and effort (five optimization loops) is the result of the present study.

摘要

提出了一种基于 CFD 的伴随求解器工具来修改三体船的船体形状。优化过程的成本函数被认为是三体船在巡航速度下阻力的总和。网格灵敏度给出了与网格变形相关的成本函数的灵敏度。网格变形工具用于更改几何形状，而无需重新访问 CAD 环境。网格变形控制点的位置是优化过程中使用的设计变量。这种优化的目的是展示基于网格变形伴随方法的流体动力学复杂几何形状的局限性和能力。根据数值结果，在有限的迭代次数中观察到三体船的总阻力降低了 6.67%。同时，在舷侧船体上观察到重大修改。