标题： 涡轮机械高保真模拟的模态分析 显示英文标题

标题： Modal analysis of high-fidelity simulations in turbomachinery

摘要： 我们重新审视最近发表的高保真隐式大涡模拟数据集，这些数据集是使用高阶不连续伽辽金谱元方法获得的，并利用本征正交分解（POD）以及谱本征正交分解（SPOD）对其进行分析。 第一个配置是MTU T161低压涡轮叶栅，在干净版本中解析了端壁边界层，并有一个带有来流湍流尾涡的版本。 我们关注层流分离泡和二次流系统的 behaviour 以及这些现象如何受到来流尾涡的影响。 第二个配置是一个跨音速压缩机叶栅，在其中分析激波边界层相互作用的非定常行为。 在整篇论文中，我们试图不仅讨论流动物理现象，还探讨模态分解技术如何有助于理解流动以及它们的局限性在哪里。 显示英文摘要

摘要： We revisit recently published high-fidelity implicit large eddy simulation datasets obtained with a high-order discontinuous Galerkin spectral element method and analyse them using Proper Orthogonal Decomposition (POD) as well as Spectral Proper Orthogonal Decomposition (SPOD). The first configuration is the MTU T161 low-pressure turbine cascade with resolved end wall boundary layers in a clean version and one with incoming turbulent wakes. We focus on the behaviour of the laminar separation bubble and the secondary flow system and how these phenomena are affected by incoming wakes. The second configuration is a transonic compressor cascade in which we analyse the unsteady behaviour of the shock wave boundary layer interaction. Throughout the paper, we try to discuss not only the flow physics but also insights into how the modal decomposition techniques can help facilitate understanding and where their limitations are.