Shape Optimization and Sensitivity Analysis of a Liner under Grazing Flow

掠流作用下衬管形状优化及敏感性分析

基本信息

项目摘要

Acoustic Liners play a key role as silencers in many technical applications. The aim of the project is to gain a better understanding of the mechanism that governs the noise reduction. We will closely monitor the coupling between the sound field and the turbulent flow of a Liner.First we want to maximize the sound attenuation of various Liners, each working at a different frequency. For this purpose we plan to apply an Optimal Shape Design (OSD) tool. To be precise, a Gradient method with the adjoint Navier-Stokes equations will be used. Based on this shape optimization we would like to compare the flow field and the acoustic field of the various optimization runs. In particular, the modifications of the characteristic fluid structures and their respective frequencies / attenuations shall be analyzed with a Dynamic Mode Decomposition (DMD). These modifications of the DMD-modes /-eigenvalues after optimizing certain frequencies, indicate the related damping mechanism. Furthermore, an approximate Sensitivity analyses adapted from DMD-modes shall be carried out in order to determine the sensitivity of the attenuation.In our preliminary work the DMD as well as the OSD tool could already be applied successfully. In case of a Liner such methods are new.
声学衬里在许多技术应用中起着消声器的关键作用。该项目的目的是更好地了解降噪的机制。我们将密切监测声场和内衬湍流之间的耦合。首先,我们希望最大限度地提高各种内衬的声音衰减,每种内衬都工作在不同的频率。为此,我们计划应用最佳形状设计(OSD)工具。准确地说,将使用伴随Navier-Stokes方程的梯度法。基于这种形状优化,我们想比较各种优化运行的流场和声场。特别是,应使用动态模式分解(DMD)分析特征流体结构的修改及其各自的频率/衰减。在优化某些频率之后DMD模式/特征值的这些修改指示相关的阻尼机制。此外,应进行适用于DMD模式的近似灵敏度分析,以确定衰减的灵敏度。在我们的初步工作中,DMD和OSD工具已经成功应用。在内衬的情况下,这种方法是新的。

项目成果

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Professor Dr. Jörn Lothar Sesterhenn其他文献

Professor Dr. Jörn Lothar Sesterhenn的其他文献

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{{ truncateString('Professor Dr. Jörn Lothar Sesterhenn', 18)}}的其他基金

Identification of transport-dominated large-scale structures in turbulent wall-bounded flows using a Characteristic DMD
使用特征 DMD 识别湍流壁面流动中以输运为主的大型结构
  • 批准号:
    429461620
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Acoustic investigation of a hollow chamber in turbulent flow
湍流中空腔的声学研究
  • 批准号:
    378373148
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Analysis and Control of Shock-Oszillation with Adjoint Methods
伴随方法的冲击振动分析与控制
  • 批准号:
    160555789
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Instabilitäten und Transition der kompressiblen Vorderkantenströmung an einem schiebenden Tragflügel unendlicher Spannweite
无限翼展推力翼上可压缩前缘流的不稳定性和转变
  • 批准号:
    5454501
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Shock-induced noise in supersonic jets
超音速喷气机中的冲击引起的噪声
  • 批准号:
    5405925
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Research Units
Towards Experimental Inflow Conditions for Direct Numerical Simulations from Data Assimilation
数据同化直接数值模拟的实验流入条件
  • 批准号:
    542503842
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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