Small-scale entrainment in inclined gravity currents

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Title: Small-scale entrainment in inclined gravity currents
Author(s): Van Reeuwijk, M
Krug, D
Holzner, M
Item Type: Journal Article
Abstract: We investigate the effect of buoyancy on the small-scale aspe cts of turbulent entrainment by performing direct numerical simu lation of a gravity cur- rent and a wall jet. In both flows, we detect the turbulent/non turbulent interface separating turbulent from irrotational ambient flow region s using a range of en- strophy iso-levels spanning many orders of magnitude. Conf orm to expectation, the relative enstrophy isosurface velocity v n in the viscous superlayer scales with the Kolmogorov velocity for both flow cases. We connect the in tegral entrainment coefficient E to the small-scale entrainment and observe excellent agree ment be- tween the two estimates throughout the viscous superlayer. The contribution of baroclinic torque to v n is negligible, and we show that the primary reason for reduced entrainment in the gravity current as compared to th e wall-jet is the reduction in the surface area of the isosurfaces.
Date of Acceptance: 8-Feb-2017
ISSN: 1573-1510
Publisher: Springer Verlag (Germany)
Journal / Book Title: Environmental Fluid Mechanics
Copyright Statement: This paper is embargoed until publication. Once published will be available fully open access.
Keywords: Meteorology & Atmospheric Sciences
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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