In this paper we study the motion of a fluid with several dispersed particles whose concentration is very small (smaller than 10−3), with possible applications to problems coming from geophysics, meteorology, and oceanography. We consider a very dilute suspension of heavy particles in a quasi-incompressible fluid (low Mach number). In our case the Stokes number is small and --as pointed out in the theory of multiphase turbulence-- we can use an Eulerian model instead of a Lagrangian one. The assumption of low concentration allows us to disregard particle--particle interactions, but we take into account the effect of particles on the fluid (two-way coupling). In this way we can study the physical effect of particle inertia (and not only passive tracers), with a model similar to the Boussinesq equations. The resulting model is used in both direct numerical simulations and large eddy simulations of a dam-break (lock-exchange) problem, which is a well-known academic test case. Keywords: Dilute suspensions, Eulerian models, direct and large eddy simulations, slightly compressible flows, dam-break (lock-exchange) problem.
|Autori:||Berselli L.C.; Cerminara M.; Iliescu T.|
|Titolo:||Disperse two-phase flows, with applications to geophysical problems|
|Anno del prodotto:||2015|
|Digital Object Identifier (DOI):||10.1007/s00024-014-0889-5|
|Appare nelle tipologie:||1.1 Articolo in rivista|