Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/8355
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dc.contributor.authorWissink, JG-
dc.contributor.authorRodi, W-
dc.date.accessioned2014-04-29T13:53:01Z-
dc.date.available2014-04-29T13:53:01Z-
dc.date.issued2011-
dc.identifier.citationJournal of Fluid Mechanics, 669, 64 - 89, 2011en_US
dc.identifier.issn0022-1120-
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/8355-
dc.descriptionCopyright © 2011 Cambridge University Press.en_US
dc.description.abstractThe effect of an incoming wake on the flow around and heat transfer from the stagnation region of a circular cylinder was studied using direct numerical simulations (DNSs). Four simulations were carried out at a Reynolds number (based on free-stream velocity and cylinder diameter D) of Re = 13200: one two-dimensional (baseline) simulation and three three-dimensional simulations. The three-dimensional simulations comprised a baseline simulation with a uniform incoming velocity field, a simulation in which realistic wake data - generated in a separate precursor DNS - were introduced at the inflow plane and, finally, a simulation in which the turbulent fluctuations were removed from the incoming wake in order to study the effect of the mean velocity deficit on the heat transfer in the stagnation region. In the simulation with realistic wake data, the incoming wake still exhibited the characteristic meandering behaviour of a near-wake. When approaching the regions immediately above and below the stagnation line of the cylinder, the vortical structures from the wake were found to be significantly stretched by the strongly accelerating wall-parallel (circumferential) flow into elongated vortex tubes that became increasingly aligned with the direction of flow. As the elongated streamwise vortical structures impinge on the stagnation region, on one side they transport cool fluid towards the heated cylinder, while on the other side hot fluid is transported away from the cylinder towards the free stream, thereby increasing the heat transfer. The DNS results are compared with various semi-empirical correlations for predicting the augmentation of heat transfer due to free-stream turbulence.en_US
dc.description.sponsorshipGerman Research Foundationen_US
dc.language.isoenen_US
dc.publisherCambridge University Pressen_US
dc.subjectBuoyant boundary layersen_US
dc.subjectTurbulence simulationen_US
dc.subjectVortex interactionsen_US
dc.titleDirect numerical simulation of heat transfer from the stagnation region of a heated cylinder affected by an impinging wakeen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1017/S0022112010004866-
dc.identifier.doihttp://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8093642-
pubs.organisational-data/Brunel-
pubs.organisational-data/Brunel/Brunel Active Staff-
pubs.organisational-data/Brunel/Brunel Active Staff/School of Engineering & Design-
pubs.organisational-data/Brunel/Brunel Active Staff/School of Engineering & Design/Mechanical Engineering-
Appears in Collections:Publications
Mechanical and Aerospace Engineering
Dept of Mechanical and Aerospace Engineering Research Papers

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