EPTT 2020

12th Spring School on Transition and Turbulence

Direct numerical simulation of bi-disperse particle-laden gravity currents on lock-exchange configuration with different Schmidt number

Submission Author: Guilherme Torres Marques Vidal , RS
Co-Authors: Guilherme Torres Marques Vidal, Gabriel Fernando Narváez Campo, Jorge Silvestrini
Presenter: Guilherme Torres Marques Vidal

doi://10.26678/ABCM.EPTT2020.EPT20-0109

 

Abstract

We performed direct numerical simulations (DNS) of bi-disperse particle-laden gravity currents on a lock-exchange configuration with different values of Schmidt number for each particle fraction, to investigate the impact of double mass diffusivity on flow dynamics and deposition. We used the high-order code Incompact3d to solve the incompressible Navier-Stokes equations and the scalar transport equation. We compared our results with previous physical and numerical experiments available in the bibliography, obtaining a good agreement. Comparing our simulations we found that the impact of double mass diffusivity is a reduction of the front velocity of current in the deceleration current regime, for the simulation with bigger Schmidt number, for coarser particle fraction. This impact in the temporal evolution of the flow caused a difference in the configuration of the final deposit profile for each simulation, specially in the position of peaks.

Keywords

Bi-disperse current, Numerical direct simulation, particle-laden gravity currents, High order numerical methods, Particle Deposition

 

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