A Study on Flow Noise Simulation Using the SUBOFF Model Based on Bayesian Sparse Grids
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摘要: 本文提出了一种基于贝叶斯的稀疏网格修正方法, 旨在解决大尺度稀疏网格下有限元模型因网格尺寸与湍流边界层压力空间相关尺度不匹配, 而造成的流激噪声预测精度下降问题。以 DARPA SUBOFF 5470 潜艇模型为研究对象, 采用数值仿真方法探究了其在潜艇模型附体远场声辐射预测中的适用性。研究基于 Corcos 自谱与归一化互功率谱密度函数计算模型, 通过虚拟网格细化补偿低频湍流脉动压力的空间相关特征; 并结合工程特性与运动环境, 提取脉动压力影响因素的关联性, 最终构建了流激噪声激励力的贝叶斯网络模型。数值研究中采用增壁面解析 LES(WRLES-Wall-Resolved LES) 结合Ffowcs Williams-Hawkings(FW-H) 声类比方法, 通过修正后仿真计算得到的流激噪声与精细化网格流固耦合仿真计算结果, 及附体 SUBOFF 5470 构型与无附体模型在声学特性上进行对比, 仿真实验对比证明贝叶斯稀疏网格修正方法能弥补因网格尺度与湍流相关尺度不匹配引起的预测偏差, 验证该方法的合理性与适用性。Abstract: This paper proposes a Bayesian-based sparse grid correction method to address the degradation in flow-induced noise prediction accuracy arising from mismatched spatial scales between finite element model grid dimensions and turbulent boundary layer pressure in large-scale sparse grids. Using the DARPA SUBOFF 5470 submarine model as a case study, numerical simulations were conducted to investigate its applicability in predicting far-field acoustic radiation from submarine appendages. The study employs Corcos's self-spectrum and normalised cross-power spectral density function computational model, utilising virtual mesh refinement to compensate for the spatial correlation characteristics of low-frequency turbulent pulsation pressures. By integrating engineering characteristics and operational environments, the correlation between pulsation pressure influencing factors is extracted, ultimately constructing a Bayesian network model for flow-induced noise excitation forces. Employing wall-resolved LES (WRLES) coupled with the Ffowcs Williams-Hawkings (FW-H) acoustic analogy method, the flow-induced noise obtained from the modified simulation calculations and the results of the refined mesh fluid-structure interaction simulation. Acoustic characteristics are contrasted between the SUBOFF 5470 configuration with appendages and the bare hull. Simulation experiments demonstrate that the Bayesian sparse grid correction method effectively compensates for prediction errors arising from mismatches between grid scales and turbulence-relevant scales, validating the method's validity and applicability.
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Key words:
- SUBOFF model /
- Bayesian /
- hydrodynamic noise /
- spatial correlation
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表 1 贝叶斯网络节点划分
Table 1. Bayesian Network Node Partitioning t
类别 物理信息 变量状态 输入节点 $ \omega $ 连续变化 $ \Delta x $ 不变化 $ {\rho }_{0} $ 离散变化 $ L $ 不变化 $ v $ 离散变化 $ {U}_{0} $ 不变化 连续变化 $ \beta $ 连续变化 $ {a}^{+} $ 连续变化 $ \gamma $ 连续变化 中间节点 变化 连续变化 输出节点 变化 表 2 带附体和无附体SUBOFF 5470潜艇模型主要几何参数
Table 2. Primary geometric parameters of SUBOFF 5470 submarine model with and without appendages
参数 符号 数值 带附体模型 无附体模型 总长 L/m 4.356 4.356 最大船体直径 D/m 0.254 0.254 表面积 S/m2 6.338 5.988 表 3 不同方法计算时间对比
Table 3. Comparison of calculation time for different methods
计算模型 计算步骤 计算时长/h 总计算时长/h 贝叶斯修正计算模型 网格划分 0.5 146.5~147.5 激励修正 1~2 耦合计算 145 精细网格流固
耦合计算模型网格划分 6 977 耦合计算 971 -
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