CUED Publications database

Geometry-induced fluctuations in the transitionally rough regime

Abderrahaman-Elena, N and García-Mayoral, R (2017) Geometry-induced fluctuations in the transitionally rough regime. In: UNSPECIFIED.

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Direct numerical simulations of turbulent flows over rough surfaces are conducted to investigate the physics of the transitionally rough regime. Different roughness sizes are analysed within the transitional regime, for a given roughness shape. We decompose the flow into a turbulent, geometry-independent contribution, and a geometry-induced contribution, whose intensity is modulated by the overlying turbulence. In the onset of the transitionally rough regime, the turbulent component remains essentially unmodified compared to smooth-wall turbulence, and the roughness effects can be attributed entirely to the geometry-induced fluctuations. As the roughness size increases further, the turbulent component is also modified, and the effect of the surface on the flow becomes more complex.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 28 Nov 2017 01:44
Last Modified: 10 Apr 2021 22:40