Topographical effects of roughness on turbulence statistics in roughness sublayer

the effects of changing roughness on the flow structure in the bends

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

Abstract to Turbulence and Scalar Transport in Roughness Sub-layers SPATIAL HOMOGENEITY IN THE FOREST ROUGHNESS SUBLAYER?

to Turbulence and Scalar Transport in Roughness Sub-layers SPATIAL HOMOGENEITY IN THE FOREST ROUGHNESS SUBLAYER? Ebba Dellwik, Sven-Erik Gryning, Ferhat Bingöl & Jakob Mann Risø National Laboratory For forested surfaces, the roughness sublayer is defined as a layer with enhanced eddy diffusivity compared to inertial sublayer scaling (e.g. Cellier and Brunet, 1992). In urban areas, the roughness...

Unsteady Turbulence in Tidal Bores: Effects of Bed Roughness

A tidal bore is a wave propagating upstream as the tidal flow turns to rising. It forms during spring tide conditions when the flood tide is confined to a narrow funneled channel. To date, theoretical and numerical studies rely upon physical experiments to validate the developments, but the experimental data are limited mostly to visual observations and sometimes free-surface measurements. Here...

Influence of surface heterogeneity on scalar dissimilarity in the roughness sublayer

While it is generally known that surface heterogeneityweakens the application ofMonin–Obukhov similarity (MOS), few studies have investigated how seasonal changes in the degree of surface heterogeneity at a particular site may influence the validity of the similarity application. Exploiting seasonal changes in forest function associated with senescence, we conduct a unique evaluation of the eff...

Wind Loads on Multiple Cylinders Arranged in Tandem with Effects of Turbulence and Surface Roughness