Reynolds Number Dependency of Wall-Bounded Turbulence Over a Surface Partially Covered by Barnacle Clusters

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2023-10-25 DOI:10.1007/s10494-023-00495-2

Sotirios Sarakinos, Angela Busse

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Abstract

Abstract The settlement of barnacles on a ship hull is a common form of marine biofouling. In this study, the Reynolds number dependency of turbulent flow over a surface partially covered by barnacle clusters is investigated using direct numerical simulations of turbulent channel flow at friction Reynolds numbers ranging from 180 to 720. Mean flow, Reynolds and dispersive stress statistics are evaluated and compared to the corresponding results for a generic irregular rough surface with a Gaussian height distribution. For the barnacle surface, distinctive features emerge in the velocity statistics due to the interplay between the barnacle clusters and the large, connected smooth-wall sections surrounding them. This aspect is further investigated by applying a rough-smooth decomposition to the local time-averaged flow statistics for the barnacle surface. Using this decomposition, the partial recovery of smooth-wall behaviour over the smooth sections of the barnacle surface can be observed in the Reynolds stress statistics with the streamwise Reynolds stresses exhibiting a similar behaviour as previously found for boundary layers over surfaces with a rough to smooth transition.

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部分被藤壶簇覆盖表面壁面湍流的雷诺数依赖性

摘要藤壶在船体上的沉降是一种常见的海洋生物污染形式。在本研究中，采用直接数值模拟的方法研究了部分被藤壶簇覆盖的表面上湍流的雷诺数依赖关系，其摩擦雷诺数范围为180至720。对具有高斯高度分布的一般不规则粗糙表面的平均流量、雷诺数和色散应力统计量进行了评估，并与相应的结果进行了比较。对于藤壶表面，由于藤壶簇与周围大的、连接的光滑壁段之间的相互作用，在速度统计中出现了独特的特征。通过对藤壶表面的局部时间平均流量统计数据应用粗糙光滑分解，进一步研究了这方面。利用这种分解，可以在雷诺数应力统计中观察到藤壶表面光滑部分上光滑壁面行为的部分恢复，其中沿流的雷诺数应力表现出与先前发现的粗糙到光滑过渡表面上的边界层相似的行为。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

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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