Direct numerical simulation of boundary layer start-up on semi-infinite vertical flat plates for buoyant and non-buoyant flows

Morgan, P.L.;Armfield, S.W.;Lin, Wenxian;Patterson, J.C.

Abstract

Direct numerical simulation for the start-up of an incompressible forced boundary layer on a semi-infinite vertical flat plate was carried out to obtain the basic features and velocity scales associated with this flow. These results were compared with those obtained for a natural convection boundary layer impulsively started on a semi-infinite vertical plane plate. A major difference between the two flows is that in the forced boundary layer the maximum velocity scale is that of the advection velocity, whereas in the natural convection boundary layer the flow development shows a velocity scale 50% greater than the advection velocity. Additionally the natural convection boundary layer exhibits an unstable traveling wave packet which is not present in the forced boundary layer. the results obtained in this paper provide strong support for the hypothesis that the dominant features of the natural convection boundary layer are a result of the stability features of that flow.

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0918-6654

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International Society of Computational Fluid Dynamics

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