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

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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部分被藤壶群覆盖表面上的壁界湍流的雷诺数依赖性

藤壶在船体上的沉降是一种常见的海洋生物污损形式。在本研究中，通过对摩擦雷诺数在 180 到 720 之间的湍流通道流进行直接数值模拟，研究了部分被藤壶集群覆盖的表面上湍流的雷诺数相关性。对平均流、雷诺数和分散应力统计进行了评估，并与具有高斯高度分布的一般不规则粗糙表面的相应结果进行了比较。对于藤壶表面，由于藤壶集群和其周围大面积相连的光滑壁面之间的相互作用，速度统计中出现了明显的特征。通过对藤壶表面的局部时间平均流量统计进行粗糙-光滑分解，进一步研究了这一方面。利用这种分解方法，可以在雷诺应力统计中观察到藤壶表面光滑部分部分恢复光滑壁面的行为，流向雷诺应力表现出类似于以前在粗糙向光滑过渡表面的边界层中发现的行为。

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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.