Study of Local Turbulence Profiles Relative to the Particle Surface in Particle Laden Turbulent Flows

Abstract

As particleresolved simulations (PRSs) of turbulent flows laden with finitesize solid particles become feasible, methods are needed to analyze the simulated flows in order to convert the simulation data to a form useful for model development. In this paper, the focus is on turbulence statistics at the moving fluid–solid interfaces. An averaged governing equation is developed to quantify the radial transport of turbulent kinetic energy when viewed in a frame moving with a solid particle. Using an interfaceresolved flow field solved by the lattice Boltzmann method (LBM), we computed each term in the transport equation for a forced, particleladen, homogeneous isotropic turbulence. The results illustrate the distributions and relative importance of volumetric source and sink terms, as well as pressure work, viscous stress work, and turbulence transport. In a decaying particleladen flow, the dissipation rate and kinetic energy profiles are found to be selfsimilar.