Large Eddy Simulation of particle-laden turbulent channel flows with isotropic or non-isotropic wall roughness

Darko Radenkovic (1) , Pascal Fede (2) , Olivier Simonin (2) , Cvetko Crnojevic (1)

1 University of Belgrade [Belgrade]
2 IMFT - Institut de mécanique des fluides de Toulouse

In particle-laden flows, particles rebound from rough wall can influence significantly properties of particle and fluid phase which can be important in number of industry processes. 2D stochastic procedures for such a rebound have been developed for representing the effect of wall roughness although such mechanism is generally 3D due to the particle incident velocity and roughness geometry. Therefore we have developed a general approach allowing to represent the 3D particle bouncing on isotropic or non-isotropic rough wall. Thus effect of the isotropic and non-isotropic roughness is evaluated using DPS/LES in horizontal channel flow. Inter-particle collisions are calculated using soft sphere model. Different LES subgrid models of pure fluid flow are examined and influence of subgrid turbulent fluid velocity on particle statistics is evaluated. Detailed information regarding particle velocity statistics are discussed with respect to wall roughness characteristics.

Mots clés: Large eddy simulations; Particle-laden flows; Particle-wall interaction; Rough wall; Stochastic models

Domaines: Mécanique des fluides [physics.class-ph]

Darko Radenkovic, Pascal Fede, Olivier Simonin, Cvetko Crnojevic. Large Eddy Simulation of particle-laden turbulent channel flows with isotropic or non-isotropic wall roughness. 10th International Conference on Multiphase Flow (ICMF 2019), May 2019, Rio de Janeiro, Brazil. pp.0. ⟨hal-03624054⟩