Measurements for Characteristics of Turbulence over a Streamwise Preferential Porous Substrate

IF 2 3区 工程技术 Q3 MECHANICS
Mahiro Morimoto, Ryoma Aoki, Yusuke Kuwata, Kazuhiko Suga
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Abstract

To investigate the turbulence characteristics over a streamwise-preferential porous substrate, we design a layered porous medium that satisfies the turbulent drag-reducing conditions suggested by the direct numerical simulation (DNS) of Gómez-de Segura and García-Mayoral (J Fluid Mech 875:124–172, 2019). Planar particle image velocimetry (PIV) measurements are carried out for fully developed turbulent flows over substrates made of the layered porous medium. Two (square duct and two-dimensional channel) flow cases are considered. Streamwise-wall-normal plane measurements are performed at the bulk Reynolds numbers \(Re_b=\)5000–15000 for the square duct flows. The measurement data indicate that with the drag-reducing conditions, which are suggested by the DNS, turbulence over the porous substrate is suppressed to a similar level to that near a solid smooth wall. For further discussion, we then carry out another PIV campaign for channel flows. With streamwise-wall-normal and streamwise-spanwise plane measurements of channel flows at \(Re_b=\)3000–15000, it is observed that the turbulence level near the porous medium is more significant than that near the solid wall. To investigate why turbulence over the layered porous medium behaves unlike in the DNS, we analyse the data comparing with our previously studied porous medium turbulence. With the spanwise streak distributions and quadrant analyses, their similarity and dissimilarity of turbulence structures are discussed.

Abstract Image

Abstract Image

测量流向优选多孔基质上的湍流特性
为了研究流向优选多孔基底上的湍流特性,我们设计了一种分层多孔介质,该介质满足 Gómez-de Segura 和 García-Mayoral 的直接数值模拟 (DNS) 提出的减少湍流阻力条件(J Fluid Mech 875:124-172, 2019)。平面粒子图像测速仪(PIV)测量了由层状多孔介质构成的基底上完全发展的湍流。考虑了两种(方形管道和二维通道)流动情况。对于方形管道流,在体积雷诺数(Re_b=\)5000-15000 时进行了流线-壁面-法向平面测量。测量数据表明,在 DNS 建议的减阻条件下,多孔基底上的湍流被抑制到与实心光滑壁附近的湍流相似的水平。为了进一步讨论,我们随后对通道流进行了另一次 PIV 试验。通过在 \(Re_b=\)3000-15000 条件下对通道流进行流向-壁面-法线和流向-跨度平面测量,可以观察到多孔介质附近的湍流水平比实体壁面附近的湍流水平更为显著。为了研究分层多孔介质上的湍流与 DNS 中的湍流表现不同的原因,我们将数据与之前研究的多孔介质湍流进行了对比分析。通过跨度条纹分布和象限分析,讨论了湍流结构的异同。
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来源期刊
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion 工程技术-力学
CiteScore
5.70
自引率
8.30%
发文量
72
审稿时长
2 months
期刊介绍: Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.
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