Reynolds number dependence of Reynolds and dispersive stresses in turbulent channel flow past irregular near-Gaussian roughness
TO Jelly, A Busse
International Journal of Heat and Fluid Flow | Elsevier | Published : 2019
Direct numerical simulations of fully-developed turbulent channel flow with irregular rough walls have been performed at four friction Reynolds numbers, namely, 180, 240, 360 and 540, yielding data in both the transitionally- and fully-rough regime. The same roughness topography, which was synthesised with an irregular, isotropic and near-Gaussian height distribution, is used in each simulation. Particular attention is directed towards the wall-normal variation of flow statistics in the near-roughness region and the fluid-occupied region beneath the crests, i.e. within the roughness canopy itself. The goal of this study is twofold. (i) Provide a detailed account of first- and second-order do..View full abstract
Awarded by EPSRC
This work was funded by EPSRC grants EP/P004687/1 and EP/P009875/1. Compute time on the ARCHER supercomputing facility (http://www.archer.ac.uk) via the UK Turbulence Consortium (EPSRC grant EP/L000261/1) and ARCHIE-WeSt High Performance Computer (www.archie-west.ac.uk) (EPSRC grant EP/K000586/1) are both acknowledged. T. O. J. acknowledges his Honorary Fellowship at the University of Glasgow and the financial support of the University of Melbourne Early Career Researcher grant.