A second-generation URANS model (STRUCT- $$\epsilon $$ ) applied to a generic side mirror and its impact on sound generation

IF 8.7 2区 工程技术 Q1 Mathematics
J. Munoz-Paniagua, J. García, E. Latorre-Iglesias
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引用次数: 0

Abstract

A generic side mirror can be approximated to the combination of a half cylinder topped with a quarter of sphere. The flow structure in the wake of the side mirror is highly transient and the turbulence plays an important role affecting aeroacoustics through pressure fluctuation. Thus, this geometry is one of the test cases object of several numerical studies in recent years to assess the aerodynamic and aeroacoustic capabilities of the turbulence models. In this context, this study presents how the second-generation URANS closure STRUCT-\(\epsilon \) is able to properly predict the expected stagnation, flow separation and vortex shedding phenomena. Besides, the predictive accuracy for the noise generation mechanism is evaluated by comparing the spectra of the sound pressure level measured at several static pressure sensors with the numerical results obtained with the STRUCT-\(\epsilon \). The response of this turbulence model has exceeded that from other hybrid methods and is in good agreement with the results from Large-Eddy Simulations or the experiments. To conclude the paper, the applicability of STRUCT-\(\epsilon \) to construct a Spectral Proper Orthogonal Decomposition method that helps identifying the most energetic modes to appropriately capture the dominant flow structures is also introduced.

Abstract Image

应用于通用侧后视镜的第二代 URANS 模型(STRUCT- $$\epsilon $$ )及其对声音产生的影响
一般的侧后视镜可近似为顶部为半圆柱体、顶部为四分之一球体的组合。侧反射镜尾流中的流动结构是高度瞬态的,湍流通过压力波动对气动声学产生重要影响。因此,这种几何形状是近年来一些数值研究的测试案例之一,以评估湍流模型的空气动力学和气动声学能力。在此背景下,本研究介绍了第二代 URANS 闭合 STRUCT-\(\epsilon \)如何能够正确预测预期的停滞、流动分离和涡流脱落现象。此外,通过比较几个静压传感器测得的声压级频谱与 STRUCT-\(\epsilon\) 数值结果,对噪声产生机制的预测精度进行了评估。该湍流模型的响应超过了其他混合方法的响应,与大型埃迪模拟或实验的结果非常一致。最后,本文还介绍了 STRUCT-\(\epsilon \)在构建频谱适当正交分解方法中的应用,该方法有助于识别最有能量的模式,以适当捕捉主要流动结构。
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来源期刊
Engineering with Computers
Engineering with Computers 工程技术-工程:机械
CiteScore
16.50
自引率
2.30%
发文量
203
审稿时长
9 months
期刊介绍: Engineering with Computers is an international journal dedicated to simulation-based engineering. It features original papers and comprehensive reviews on technologies supporting simulation-based engineering, along with demonstrations of operational simulation-based engineering systems. The journal covers various technical areas such as adaptive simulation techniques, engineering databases, CAD geometry integration, mesh generation, parallel simulation methods, simulation frameworks, user interface technologies, and visualization techniques. It also encompasses a wide range of application areas where engineering technologies are applied, spanning from automotive industry applications to medical device design.
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