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DTSTART;TZID=America/New_York:20251003T140000
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SUMMARY:PICS Colloquium: Flow and heat transfer over rough walls: fundamental physics\, numerical simulations\, and bulk parametrizations with Elie Bou-Zeid
DESCRIPTION:Understanding the physical processes modulating the transport of scalars\, such as heat\, over very rough surfaces is essential for understanding the thermal environment of\ncities\, how wind and solar farms modify heat and water exchanges between the\natmosphere and Earth surface\, and parameterizing surface physics in coarser Earth\nsystems models. This talk examines this problem in the urban context. Since passive\nscalars such as water vapor are advected with the flow\, broad similarity is expected\nbetween the widely-studied momentum transfer problem and its scalar counterpart.\nHowever\, unlike momentum that is dominated by form drag over very rough walls\,\nscalar transport must occur through the viscous exchanges at the solid-fluid interface.\nThis results in transport dissimilarity\, as well as in a continuous dependence on the\nReynolds number. In addition\, the spatial variability of the geometry gives rise to the so-\ncalled dispersive fluxes that can be larger than conventional turbulent fluxes in the\nroughness layer. In this talk we will use large eddy simulations to examine the role of\nsurface topography\, the resulting transport dissimilarity\, and novel approaches for\nparametrizing scalar exchanges using the surface renewal theory.
URL:https://seasevents.nmsdev7.com/event/pics-colloquium-flow-and-heat-transfer-over-rough-walls-fundamental-physics-numerical-simulations-and-bulk-parametrizations-with-elie-bou-zeid/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
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