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dc.contributor.authorAtoufi, Amir
dc.contributor.authorScott, K. Andrea
dc.contributor.authorWaite, Michael L 19:45:37 (GMT) 19:45:37 (GMT)
dc.descriptionThe author has the right to post and update the article on a free-access e-print server using files prepared and formatted by the author. Any such posting made or updated after acceptance of the article for publication by APS should include a link to the online APS journal article abstract. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included.en
dc.description.abstractCharacteristics of near-wall turbulence at quasistationarity under strong wall cooling are studied using direct numerical simulation of open-channel flow. It is shown that if turbulence reaches quasistationarity, then the characteristics of quasistationary near-wall turbulence, even with the strongest wall cooling rate, are generally similar to the weakly stratified case. The effects of strong stable stratification on the characteristics of near-wall turbulence are transient. The effect of stratification on several characteristics of stratified near-wall turbulence, including first-, second-, and higher-order statistics, turbulent kinetic energy budget, and mechanisms involved in the evolution of turbulence producing eddies, are discussed. It is shown that among mechanisms that contribute to the budget of turbulent kinetic energy, transfer and pressure-work are more dependent on the stratification if turbulence reaches quasistationarity. The buoyancy destruction term influences the budget for the tangential Reynolds stress more than the budget for the turbulent kinetic energy. Relevant length scales are also discussed in detail. The Corrsin and Ellison scales are smaller than the Ozmidov scales and are sensitive to stratification in the upper logarithmic layer and in the outer layer. The Corrsin scales in the lower half of the buffer layer and fine-scale structures of wall-normal velocity in the viscous sublayer are smaller than the Kolmogorov scale. Finally, the effect of heat entrainment from the upper boundary and computational domain size are also examined. In summary, it is found that the behavior of near-wall turbulence at quasistationarity is approximately similar to weakly stratified cases, regardless of the choice of upper boundary condition.en
dc.description.sponsorshipThis research was enabled in part by support provided by the Shared Hierarchical Academic Research Computing Network (SHARCNET), Compute/Calcul Canada, the Natural Sciences and Engineering Research Council of Canada (KAS: Grant No. RGPIN-418344-2012; and MLW: Grant No. RGPIN-386456-2015), and the Canadian Foundation for Innovation.en
dc.publisherAmerican Physical Societyen
dc.subjectatmospheric fluid dynamicsen
dc.subjectboundary layersen
dc.subjectshear layer turbulenceen
dc.subjectstratified geophysical flowsen
dc.subjectstructure and turbulence of boundary layersen
dc.subjectturbulent mixingen
dc.titleCharacteristics of quasistationary near-wall turbulence subjected to strong stable stratification in open-channel flowsen
dcterms.bibliographicCitationAtoufi, A., Scott, K. A., Waite, M. L. (2020, June 5). Characteristics of quasistationary near-wall turbulence subjected to strong stable stratification in open-channel flows. Physical Review Fluids, 5(6), 064-603.
uws.contributor.affiliation1Faculty of Engineeringen
uws.contributor.affiliation1Faculty of Mathematicsen
uws.contributor.affiliation2Applied Mathematicsen
uws.contributor.affiliation2Systems Design Engineeringen

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