Turbulent boundary layer flow over a three-dimensional sinusoidal surface

Simple item page
dc.contributor.authorChan, C.I.
dc.contributor.authorChin, R.C.
dc.date.issued2023
dc.description.abstractThe sinusoidal roughness effect is investigated using a direct numerical simulation (DNS) of a spatially developing turbulent boundary layer (TBL) over three-dimensional sinusoidal roughness. The validity of Townsend’s outer-layer similarity hypothesis is assessed based on comparisons of mean and second-order flow statistics, with a DNS of smooth-wall TBL data set at a similar Reynolds number. The total, Reynolds and dispersive stress tensors are calculated using the double-averaging procedure. The mean and second-order statistical similarities in the outer layer between rough-wall and smooth-wall TBLs are generally observed. The transport between total, turbulent and dispersive kinetic energy is investigated utilising triple-decomposed kinetic energy transports equations. The transport behaviour of turbulent kinetic energy (TKE) is significantly affected by the local mean shear induced by the surface roughness. However, the TKE transport shows good collapse with the smooth-wall case in the outer region of the flow. On the other hand, the transport of dispersive kinetic energy, including local production, redistribution and dissipation, are confined within the roughness sublayer. The intercomponent transfer between TKE and dispersive kinetic energy is quantified from the triple-decomposed kinetic energy transport equations. The intercomponent energy transfer is associated with the local spatial gradients of the turbulent momentum fluxes generated near the roughness canopy.
dc.description.statementofresponsibilityC.I. Chan, and R.C. Chin
dc.identifier.citationJournal of Fluid Mechanics, 2023; 975:A19-1-A19-32
dc.identifier.doi10.1017/jfm.2023.818
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.orcidChan, C.I. [0000-0002-0707-6265]
dc.identifier.orcidChin, R.C. [0000-0002-2709-4321]
dc.identifier.urihttps://hdl.handle.net/2440/140117
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.rights© The Author(s), 2023. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
dc.source.urihttps://doi.org/10.1017/jfm.2023.818
dc.subjectturbulent boundary layers; turbulence simulation
dc.titleTurbulent boundary layer flow over a three-dimensional sinusoidal surface
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Electrical and Electronic Engineering publications