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Interaction between waves and gravity currents: description of turbulence in a simple numerical model

Environmental fluid mechanics (Dordrecht, Netherlands : 2001), 2018-02, Vol.18 (1), p.117-148

Springer Science+Business Media Dordrecht 2017 ;Environmental Fluid Mechanics is a copyright of Springer, (2017). All Rights Reserved. ;ISSN: 1567-7419 ;EISSN: 1573-1510 ;DOI: 10.1007/s10652-017-9527-y

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Title:
Interaction between waves and gravity currents: description of turbulence in a simple numerical model
Author: Viviano, Antonino ; Musumeci, Rosaria E. ; Foti, Enrico
Subjects: Boussinesq approximation ; Boussinesq equations ; Classical Mechanics ; Computational fluid dynamics ; Earth and Environmental Science ; Earth Sciences ; Eddy currents ; Eddy viscosity ; Entrainment ; Environmental Physics ; Evolution ; Fluid flow ; Fluids ; Gravitation ; Gravity ; Gravity currents ; Hydrogeology ; Hydrology/Water Resources ; Mathematical models ; Modelling ; Numerical models ; Oceanography ; Original Article ; Propagation ; Surface waves ; Turbulence ; Turbulence parameters ; Velocity distribution ; Viscosity ; Vorticity ; Wave propagation
Is Part Of: Environmental fluid mechanics (Dordrecht, Netherlands : 2001), 2018-02, Vol.18 (1), p.117-148
Description: Effects of surface waves on gravity current propagation are studied by means of a numerical model. The adopted modeling approach couples a Boussinesq-type of model for surface waves and a gravity current model for stratified flows. In particular two different turbulence closure models are introduced which take into account subgrid turbulence and an additional depth-constant eddy-viscosity. The turbulence parameters are calibrated by means of experimental data on the time evolution of the heavy front, obtained both in the absence and in the presence of regular surface waves. Velocity fields, heavy and light front position, shear stresses, vorticity and entrainment calculated by the model are analyzed. The turbulence closure which includes both uniform and Smagorinsky type eddy viscosity allows a better description of the actual gravity current propagation. In particular, the results highlight the fact that the presence of the oscillatory motion causes, simultaneously, a reduction in turbulence and an increase in the mixing of heavy and light fluids. Such a result is in agreement with the experimental observations.
Publisher: Dordrecht: Springer Netherlands
Language: English
Identifier: ISSN: 1567-7419
EISSN: 1573-1510
DOI: 10.1007/s10652-017-9527-y
Source: ProQuest Central

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Interaction between waves and gravity currents: description of turbulence in a simple numerical model

Springer Science+Business Media Dordrecht 2017 ;Environmental Fluid Mechanics is a copyright of Springer, (2017). All Rights Reserved. ;ISSN: 1567-7419 ;EISSN: 1573-1510 ;DOI: 10.1007/s10652-017-9527-y

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