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首页> 外文期刊>International Journal of Heat and Fluid Flow >Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach
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Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach

机译：使用RANS / LES混合方法进行的串联汽缸流量和噪声预测

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摘要

The performance of a novel hybrid RANS/LES methodology for accurate flow and noise predictions of the NASA Tandem Cylinder Experiment is investigated. The proposed approach, the modified Flow Simulation Methodology (FSM), is based on scaling the turbulence viscosity and the turbulence kinetic energy dissipation rate with a damping function. This damping function consists of three individual components, a function based on the Kolmogorov length-scale ensuring correct behaviour in the direct numerical simulation (DNS) limit, a function ensuring that FSM provides the correct damping in large-eddy simulation (LES) mode, and a shielding function that forces the switch from Reynolds-Averaged Navier-Stokes (RANS) to LES to occur outside the boundary layer. The FSM is proposed for the kω-SST two-equation model (FSM-SST) and for an Explicit-Algebraic-Stress-Model (FSM-EASM), which is better suited to resolve anisotropy and non-equilibrium of the unresolved scales and the strain and rotation-rate dependent coefficients introduce a dynamic response of the model to the resolved flow field. Simulations are performed on a relatively coarse grid and the FSM data are compared with results obtained from the Scale-Adaptive-Simulation (SAS) and IDDES approaches. Acoustic predictions are obtained using an acoustic analogy approach based on Curie's theory. The FSM-SST approach was found to predict the hydrodynamic field in very good agreement with reference data, whereas the FSM-EASM did not improve the predictions. The acoustic spectra predicted show good agreement with experimental results at various microphone positions, with some deficiencies in capturing the broadband noise levels at high Strouhal numbers.
机译：研究了新颖的RANS / LES混合方法在NASA串联气缸实验中对流量和噪声的准确预测的性能。所提出的方法是改进的“流体模拟方法”（FSM），它基于利用阻尼函数缩放湍流粘度和湍动能耗散率。此阻尼功能由三个独立的组件组成，一个基于Kolmogorov长度尺度的功能，可确保在直接数值模拟（DNS）限制下具有正确的行为，该功能可确保FSM在大涡流仿真（LES）模式下提供正确的阻尼，并具有屏蔽功能，该功能迫使从雷诺平均Navier-Stokes（RANS）切换到LES发生在边界层之外。提出了针对kω-SST两方程模型（FSM-SST）和显式代数-应力模型（FSM-EASM）的FSM，它更适合解决各向异性和非平衡尺度和非平衡尺度的不平衡问题。应变和旋转速率相关系数将模型对解析的流场引入动态响应。在相对粗略的网格上执行模拟，并将FSM数据与从比例自适应模拟（SAS）和IDDES方法获得的结果进行比较。使用基于居里理论的声学类比方法获得声学预测。发现FSM-SST方法可以与参考数据很好地预测水动力场，而FSM-EASM不能改善预测结果。预测的声谱与在不同麦克风位置的实验结果显示出良好的一致性，但在捕获高Strouhal数时的宽带噪声水平上存在一些缺陷。

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