We use direct numerical simulations to study the fluid-solid interaction of non-dilute suspensions of spherical particles in homogeneous isotropic turbulence. I will discuss how finite-size inertial spherical particles modulate turbulence, and how they preferentially accumulate in specific regions of the flow. In particular, we observe that particles of different size and density modulate the flow in a different way. For small and heavy particles, the classical energy cascade is inhibited, and the energy transfer across scales is essentially driven by the fluid-solid interaction. We also find that particles of different size and density have a different level of clustering. I will discuss their collective motion and preferential location in relation with properties of the carrier flow.
|
 |