2022
DOI: 10.1017/jfm.2022.823
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Impact of spanwise effective slope upon rough-wall turbulent channel flow

Abstract: Whereas streamwise effective slope ( $ES_{x}$ ) is accepted as a key topographical parameter in the context of rough-wall turbulent flows, the significance of its spanwise counterpart ( $ES_{y}$ ) remains largely unexplored. Here, the response of turbulent channel flow over irregular, three-dimensional rough walls with systematically varied values of $ES_{y}$ is studied using direct numerical simulation. All simulations were perfor… Show more

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Cited by 19 publications
(8 citation statements)
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“…For the positively skewed cases, which result all in approximately in the same value for the roughness function, a higher scatter can be seen in the relationship between U + and F p /F tot . An approximately linear dependency between the fractional contribution of the pressure drag and the roughness function has previously been observed for irregular rough surfaces with different streamwise and spanwise effective slopes and approximately Gaussian height distributions [47].…”
Section: Surface Pressure Fieldsmentioning
confidence: 56%
See 1 more Smart Citation
“…For the positively skewed cases, which result all in approximately in the same value for the roughness function, a higher scatter can be seen in the relationship between U + and F p /F tot . An approximately linear dependency between the fractional contribution of the pressure drag and the roughness function has previously been observed for irregular rough surfaces with different streamwise and spanwise effective slopes and approximately Gaussian height distributions [47].…”
Section: Surface Pressure Fieldsmentioning
confidence: 56%
“…To associate physical mechanisms to changes in the Hama roughness function (Figure 5(a)), the total drag force was partitioned into its pressure and viscous components. After some manipulation, the mean pressure and viscous forces per unit area acting on the surface can be expressed as [47]…”
Section: Surface Pressure Fieldsmentioning
confidence: 99%
“…(2021) and Jelly et al. (2022), the diameter and the strength of the secondary flows is sensitive to the spanwise length scale of the roughness in proportion to the outer scale of the problem, say . Specifically, Chung et al.…”
Section: Results For Rough Pipesmentioning
confidence: 99%
“…2021; Jelly et al. 2022) and reviews (Flack & Schultz 2014; Chung et al. 2021) have explored the effects of wall roughness in (pipe or channel) turbulence.…”
Section: Introductionmentioning
confidence: 99%
“…Nikuradse (1933) was the first to study how local wall roughness (sand glued to the wall) affects global transport properties in pipe flow. Since then, numerous studies (Chan et al 2018;Rouhi, Chung & Hutchins 2019;Ma et al 2020;Modesti et al 2021;Jelly et al 2022) and reviews (Flack & Schultz 2014;Chung et al 2021) have explored the effects of wall roughness in (pipe or channel) turbulence. Instead of using open-channel or pipe flow with rough walls, we employ a Taylor-Couette (TC) apparatus, which is a closed system with an exact balance between energy input and dissipation.…”
Section: Introductionmentioning
confidence: 99%