Abstract
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.
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Acknowledgements
This work has been partly funded by the Italian Ministry of Education, Universities and Research MIUR through the Research projects of significant national interest—PRIN 2010–2011—project name HYDROCAR (cod. \(20104J2Y8M\_003\)) and the PRIN 2012 Project ”Hydro-morphodynamics modelling of coastal processes for engineering purposes” (cod. 2012BYTPR5), through the PO FESR SICILIA 2007–2013 Axis IV Operational Objective 4.1.2 Intervention lines 4.1.2.A project MedNETNA and through the EU funded project HYDRALAB PLUS (Proposal Number 64110).
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Viviano, A., Musumeci, R.E. & Foti, E. Interaction between waves and gravity currents: description of turbulence in a simple numerical model. Environ Fluid Mech 18, 117–148 (2018). https://doi.org/10.1007/s10652-017-9527-y
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DOI: https://doi.org/10.1007/s10652-017-9527-y