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arXiv 2005.07405math.NAcs.NA
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基于多指标随机配置和径向基函数代理的船舶阻力不确定性量化比较

Uncertainty Quantification of Ship Resistance via Multi-Index Stochastic Collocation and Radial Basis Function Surrogates: A Comparison

Chiara Piazzola, Lorenzo Tamellini, Riccardo Pellegrini, Riccardo Broglia, Andrea Serani, Matteo Diez

摘要:

本文介绍了两种方法的前向不确定度量化(UQ)的复杂工业问题的比较。具体而言,多指标随机配置(MISC)和自适应多保真度随机径向基函数(SRBF)代理人的性能进行评估的UQ的滚装/滚装乘客渡轮在平静的水推进,并受到两个操作的不确定性,即船速和吃水。提出并讨论了(模型尺度)阻力的期望值、标准差和概率密度函数的估计;通过内部非定常多网格雷诺平均纳维尔-斯托克斯(RANS)求解器$χ$ navis获得所需的模拟。MISC和SRBF都将RANS求解器用于多网格加速的不同网格级别的评估用作多保真度级别;这里使用四个网格级别,作为初始最细网格的各向同性粗化。结果表明,MISC可能是首选时,只有有限的数据集。对于较大的数据集,MISC和SRBF都是一个有效的选择,由于SRBF对噪声的鲁棒性,它略受青睐。

英文摘要:

This paper presents a comparison of two methods for the forward uncertainty quantification (UQ) of complex industrial problems. Specifically, the performance of Multi-Index Stochastic Collocation (MISC) and adaptive multi-fidelity Stochastic Radial Basis Functions (SRBF) surrogates is assessed for the UQ of a roll-on/roll-off passengers ferry advancing in calm water and subject to two operational uncertainties, namely the ship speed and draught. The estimation of expected value, standard deviation, and probability density function of the (model-scale) resistance is presented and discussed; the required simulations are obtained by the in-house unsteady multi-grid Reynolds Averaged Navier-Stokes (RANS) solver $χ$navis. Both MISC and SRBF use as multi-fidelity levels the evaluations on the different grid levels intrinsically employed by the RANS solver for multi-grid acceleration; four grid levels are used here, obtained as isotropic coarsening of the initial finest mesh. The results suggest that MISC could be preferred when only limited data sets are available. For larger data sets both MISC and SRBF represent a valid option, with a slight preference for SRBF, due to its robustness to noise.

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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