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• W314059222 abstract "The structure of turbulent natural convection boundary layers in differentgeometries and the effect of the buoyancy on a mixed convection boundarylayer are investigated. These geometries comprise a vertical finitecylinder, a vertical infinite channel, a cavity and a vertical finite channel.In the three cases of vertical cylinder, cavity and finite channel, the boundary layer is in the state of development whereas in the case of the infinite channel,the boundary layer has a fully developed condition. In the vertical cylinderthe natural convection is the dominant phenomenon although a small air-flowenters the geometry to reduce flow recirculations. In the case of the vertical infinitechannel and cavity there exist only a pure natural convection boundarylayer. In the vertical finite channel, however, the boundary layer is of mixed convection typeand radiation heat transfer affects its development owing to high wall temperatures.The Grashof numbers based on the cylinder height, channel width, cavityand finite channel widths reach to Gr=5*10^11, Gr=9.6*10^5,Gr=3.9*10^8 and Gr=9.4*10^7, respectively.The boundary layers are studied using two powerful numerical methods namelyDirect Numerical Simulation or DNS and Large Eddy Simulation orLES. Due to high Reynolds numbers, DNS is only used in the case of the vertical infinitechannel. Three different sub-grid scale models are used in the case of the cavityand it is shown that the dynamic SGS model is the only model that is capable of predictingthe location of the transition from laminar to turbulent flow correctly.Mean flow parameters as well as turbulence parameters in all cases are studiedand the results are compared with the existing experimental results. Comparisonsare also made between the results of the vertical cylinder and experimentalresults obtained from a vertical flat plate." @default.
• W314059222 created "2016-06-24" @default.
• W314059222 creator A5038276990 @default.
• W314059222 date "2007-01-01" @default.
• W314059222 modified "2023-09-26" @default.
• W314059222 title "A Study of Turbulent Natural Convection Boundary Layers Using Large-Eddy Simulation" @default.
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• W314059222 hasPublicationYear "2007" @default.
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