从剪应力到壁面压力谱:紊流边界层中平均压力梯度的半解析方法

IF 1 3区 物理与天体物理 Q4 ACOUSTICS
S. Prigent, C. Bailly
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引用次数: 1

摘要

本研究提供了一种半解析方法来计算湍流边界层下的壁面压力谱,仅依赖于后者的Kármán数和无因次压力梯度。通过在混合长度模型中加入总平均剪切剖面,可以在不利压力梯度、零压力梯度和有利压力梯度下重建速度剖面。这些剖面作为壁面压力谱现有模型的输入,从而消除了对实验或数值数据的需要。所建立的频谱能较好地估计实测频谱的水平。虽然重叠谱比实验数据短,但恢复了三个典型谱区,并观察了压力梯度效应的变化趋势。波数表示显示了压力梯度对对流脊结构的影响,其宽高比由不利向有利增加。在实验数据中观察到同样的变化,尽管纵横比的绝对值不匹配,但可以进行定性观察。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
From shear stress to wall pressure spectra: a semi-analytical approach to account for mean pressure gradients in turbulent boundary layers
This study offers a semi-analytical means to compute the wall pressure spectra beneath a turbulent boundary layer depending only on the latter’s Kármán number and dimensionless pressure gradient. By inclusion of the total mean shear profiles in a mixing length model, the velocity profiles can be reconstructed under adverse, zero- and favourable pressure gradients. These profiles serve as input to existing models of the wall pressure spectra and thus remove the need for experimental or numerical data. The modelled frequency spectra fairly estimate the level of the measured ones. The three typical regions of those spectra are recovered, although the overlap one is shorter than with experimental data, and the trends of pressure gradients effects are also observed. The wavenumber representation shows the effect of pressure gradients on the convective ridge structure as its aspect ratio increases from adverse to favourable ones. The same variation is observed in experimental data, and although the absolute values of the aspect ratios do not match, qualitative observations can be made.
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来源期刊
Acta Acustica
Acta Acustica ACOUSTICS-
CiteScore
2.80
自引率
21.40%
发文量
0
审稿时长
12 weeks
期刊介绍: Acta Acustica, the Journal of the European Acoustics Association (EAA). After the publication of its Journal Acta Acustica from 1993 to 1995, the EAA published Acta Acustica united with Acustica from 1996 to 2019. From 2020, the EAA decided to publish a journal in full Open Access. See Article Processing charges. Acta Acustica reports on original scientific research in acoustics and on engineering applications. The journal considers review papers, scientific papers, technical and applied papers, short communications, letters to the editor. From time to time, special issues and review articles are also published. For book reviews or doctoral thesis abstracts, please contact the Editor in Chief.
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