Numerical tripping of high-speed turbulent boundary layers

IF 2.2 3区 工程技术 Q2 MECHANICS
Alessandro Ceci, Andrea Palumbo, Johan Larsson, Sergio Pirozzoli
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引用次数: 8

Abstract

The influence of turbulence inflow generation on direct numerical simulations (DNS) of high-speed turbulent boundary layers at Mach numbers of 2 and 5.84 is investigated. Two main classes of inflow conditions are considered, based on the recycling/rescaling (RR) and the digital filtering (DF) approach, along with suitably modified versions. A series of DNS using very long streamwise domains is first carried out to provide reliable data for the subsequent investigation. A set of diagnostic parameters is then selected to verify achievement of an equilibrium state, and correlation laws for those quantities are obtained based on benchmark cases. Simulations using shorter domains, with extent comparable with that used in the current literature, are then carried out and compared with the benchmark data. Significant deviations from equilibrium conditions are found, to a different extent for the various flow properties, and depending on the inflow turbulence seeding. We find that the RR method yields superior performance in the evaluation of the inner-scaled wall pressure fluctuations and the turbulent shear stress. DF methods instead yield quicker adjustment and better accuracy in the prediction of wall friction and of the streamwise Reynolds stress in supersonic cases. Unrealistically high values of the wall pressure variance are obtained by the baseline DF method, while the proposed DF alternatives recover a closer agreement with respect to the benchmark. The hypersonic test case highlights that similar distribution of wall friction and heat transfer are obtained by both RR and DF baseline methods.

Abstract Image

高速湍流边界层的数值脱扣
研究了在马赫数为2和5.84时,湍流流入产生对高速湍流边界层直接数值模拟的影响。考虑了两类主要的流入条件,基于循环/重新缩放(RR)和数字滤波(DF)方法,以及适当修改的版本。为了为后续的调查提供可靠的数据,首先进行了一系列使用超长流域的DNS。然后选择一组诊断参数来验证平衡状态的实现,并根据基准案例获得这些量的相关规律。然后使用较短的域进行模拟,其程度可与当前文献中使用的模拟相媲美,并与基准数据进行比较。发现与平衡条件的显著偏差,在不同的流动性质下,取决于流入湍流的播种。研究发现,RR方法在计算内尺度壁面压力波动和湍流剪应力方面具有较好的性能。相反,DF方法在预测壁面摩擦和超音速情况下的流向雷诺应力方面具有更快的调整和更好的准确性。通过基线DF方法获得了不切实际的高壁压差值,而所提出的DF替代方案则恢复了与基准的更接近的一致性。高超声速试验用例表明,RR基线法和DF基线法得到的壁面摩擦和换热分布相似。
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来源期刊
CiteScore
5.80
自引率
2.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.
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