Roughness effects on the Reynolds stress budgets in near-wall turbulence

The physics of the roughness sublayer are studied by direct numerical simulations (DNS) of an open-channel flow with sandgrain roughness. A double-averaging (DA) approach is used to separate the spatial variations of the time-averaged quantities and the turbulent fluctuations. The spatial inhomogene...

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Veröffentlicht in:	Journal of fluid mechanics 2014-12, Vol.760, Article R1
Hauptverfasser:	Yuan, Junlin, Piomelli, Ugo
Format:	Artikel
Sprache:	eng
Schlagworte:	Boundary layer Budgets Channel flow Computational fluid dynamics Computer simulation Drag Dynamics Fluctuations Fluid mechanics Fluids Form drag Homogeneous turbulence Inhomogeneity Interactions Kinetic energy Open channel flow Physics Rapids Reynolds stress Reynolds stresses Roughness Shear stress Simulation Spacetime Spatial variations Studies Turbulence Velocity
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