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arXiv 2004.11201math.NAcs.NA
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借助数据驱动降阶建模技术解决船舶形状设计与优化问题的高效计算框架

An efficient computational framework for naval shape design and optimization problems by means of data-driven reduced order modeling techniques

Nicola Demo, Giulio Ortali, Gianluca Gustin, Gianluigi Rozza, Gianpiero Lavini

AI总结:

本文提出面向船舶外形优化的数据驱动ROM框架,结合FFD、DMD与POD-GPR实现阻力快速评估,使遗传算法可高效完成邮轮船体优化。

摘要:

本成果描述了数据驱动形状优化流程在船舶工程应用中的实现。我们采用降阶模型(ROM)来提高整体优化效率,同时保持模块化和无方程特性,以满足工业需求。我们将上述流程应用于一艘真实的邮轮,以降低总阻力。首先,我们利用自由形式变形(FFD)对初始形状进行参数化变形,从而定义设计空间。每个新船体的性能评估通过有限体积离散化模拟两相(水和空气)流体的流动来确定。由于流体动力学模型可能代价高昂——尤其是处理复杂工业几何结构时——我们还提出了动态模态分解(DMD)增强方法,以降低单次数值模拟的计算成本。最终,借助结合高斯过程回归的本征正交分解(POD-GPR)技术实现实时计算。得益于这种快速近似,遗传优化算法得以可行地收敛至最优形状。

英文摘要:

This contribution describes the implementation of a data--driven shape optimization pipeline in a naval architecture application. We adopt reduced order models (ROMs) in order to improve the efficiency of the overall optimization, keeping a modular and equation-free nature to target the industrial demand. We applied the above mentioned pipeline to a realistic cruise ship in order to reduce the total drag. We begin by defining the design space, generated by deforming an initial shape in a parametric way using free form deformation (FFD). The evaluation of the performance of each new hull is determined by simulating the flux via finite volume discretization of a two-phase (water and air) fluid. Since the fluid dynamics model can result very expensive -- especially dealing with complex industrial geometries -- we propose also a dynamic mode decomposition (DMD) enhancement to reduce the computational cost of a single numerical simulation. The real--time computation is finally achieved by means of proper orthogonal decomposition with Gaussian process regression (POD-GPR) technique. Thanks to the quick approximation, a genetic optimization algorithm becomes feasible to converge towards the optimal shape.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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