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.

Full text not available from this repository.

Abstract

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)
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 28 Nov 2017 01:44
Last Modified: 10 Apr 2021 22:40
DOI: