000206721 001__ 206721
000206721 005__ 20190118052840.0
000206721 037__ $$aPOST_TALK
000206721 245__ $$aThe vertical structure of eddy diffusivity in pure slope flows over smooth surfaces
000206721 269__ $$a2014
000206721 260__ $$c2014
000206721 336__ $$aTalks
000206721 520__ $$aThermally driven slope flows are ubiquitous in nature and play a major role in regulating local microclimates in valleys, glaciers and ice-sheets. They control in large part surface momentum, heat and moisture fluxes, and their effects must therefore be accounted for in weather prediction and climate models. Due to the interplay between shear and buoyancy in generating and destroying turbulence, the thermal and hydrodynamic boundary layers that characterizes slope flows are very shallow, with turbulent motions of reduced size, when compared to those populating neutral and convective boundary layers, posing serious difficulties in terms of computational resolution and modeling requirements. Not surprisingly, therefore, considerable effort has been devoted in designing parameterizations, for use in larger scale models. In this direction goes the current work, where we use direct numerical simulations (DNS) to determine the vertical profiles of momentum and buoyancy eddy diffusivities, for pure slope flows over smooth surfaces. Mean flow profiles from one-dimensional models are then compared against DNS results at various sloping angles and results will be discussed.
000206721 6531_ $$aDNS
000206721 6531_ $$aSlope flows
000206721 6531_ $$aTurbulence
000206721 700__ $$0246172$$g218957$$aGiometto, Marco Giovanni
000206721 700__ $$0240839$$g133327$$aFang, Jiannong
000206721 700__ $$aParlange, Marc$$g155043$$0242902
000206721 7112_ $$cSan Francisco$$a67th Annual Meeting of the APS Division of Fluid Dynamics
000206721 909C0 $$xU11028$$0252105$$pEFLUM
000206721 909C0 $$xU12172$$0252260$$pWIRE
000206721 909CO $$ppresentation$$pENAC$$ooai:infoscience.tind.io:206721
000206721 917Z8 $$x218957
000206721 937__ $$aEPFL-TALK-206721
000206721 973__ $$aEPFL
000206721 980__ $$aTALK