On the impact of frontal solidity on turbulent boundary layers over irregular bio-inspired surfaces

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-09-08 DOI:10.1016/j.ijheatfluidflow.2025.109991

Ioannis K. Kaminaris , Elias Balaras , Vidya Vishwanathan , Michael P. Schultz

{"title":"On the impact of frontal solidity on turbulent boundary layers over irregular bio-inspired surfaces","authors":"Ioannis K. Kaminaris , Elias Balaras , Vidya Vishwanathan , Michael P. Schultz","doi":"10.1016/j.ijheatfluidflow.2025.109991","DOIUrl":null,"url":null,"abstract":"<div><div>The impact of bio-inspired topographies on the mean flow statistics is studied via direct numerical simulations of spatially developing turbulent boundary layers with zero pressure gradient and validated against a peer experimental study. Calcareous biofouling topographies similar to those found on the hull of naval vessels are selected as study cases comprising barnacle- and tubeworm-type organisms both at one fixed planar solidity and two different frontal solidities. Topographies are synthesized via an in-house surface synthesis algorithm in order to mimic actual biofouled topographies. Focus is given on the effect of the frontal solidity, which is investigated by performing a parametric study where only the latter is altered while the rest of the main topographical statistics are kept the same. Strong correlation is observed between the frontal solidity and the roughness function, <span><math><mrow><mi>Δ</mi><msup><mrow><mi>U</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span>, the boundary layer growth rate and the pressure forces exerted on the surfaces. However, that correlation was found to be more dominant in the barnacle-type topographies. All surfaces induce strong near-wall flow separation, while its characteristics are investigated through a histogram-based analysis of the surface forces.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"117 ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Fluid Flow","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0142727X25002498","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The impact of bio-inspired topographies on the mean flow statistics is studied via direct numerical simulations of spatially developing turbulent boundary layers with zero pressure gradient and validated against a peer experimental study. Calcareous biofouling topographies similar to those found on the hull of naval vessels are selected as study cases comprising barnacle- and tubeworm-type organisms both at one fixed planar solidity and two different frontal solidities. Topographies are synthesized via an in-house surface synthesis algorithm in order to mimic actual biofouled topographies. Focus is given on the effect of the frontal solidity, which is investigated by performing a parametric study where only the latter is altered while the rest of the main topographical statistics are kept the same. Strong correlation is observed between the frontal solidity and the roughness function,

Δ U^{+}

, the boundary layer growth rate and the pressure forces exerted on the surfaces. However, that correlation was found to be more dominant in the barnacle-type topographies. All surfaces induce strong near-wall flow separation, while its characteristics are investigated through a histogram-based analysis of the surface forces.

查看原文本刊更多论文

锋面固体度对不规则生物表面湍流边界层的影响

通过直接数值模拟空间发展的零压力梯度湍流边界层，研究了仿生地形对平均流动统计数据的影响，并通过同行实验研究进行了验证。与海军舰艇船体相似的钙质生物污垢地形被选择作为研究案例，其中包括一种固定的平面固体和两种不同的正面固体的藤壶和管虫型生物。地形是通过内部表面合成算法合成的，以模拟实际的生物污染地形。重点放在正面坚固性的影响上，这是通过执行参数研究来调查的，其中只有后者被改变，而其余的主要地形统计数据保持不变。锋面固体度与粗糙度函数ΔU+、边界层生长速率和施加在表面上的压力有很强的相关性。然而，这种相关性在藤壶型地形中更为明显。所有表面都诱发了强烈的近壁流动分离，而其特征是通过基于直方图的表面力分析来研究的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.