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Direct numerical simulations two-way coupled with inertial particles are usedto investigate the particle distribution and two-way coupling effect oflow-inertia ($St_{LSM}=0.0625$, $St_{VLSM}=0.009$) and high-inertia($St_{LSM}=0.475$, $St_{VLSM}=0.069$) particles associated with the large-scalemotions (LSMs) and very-large-scale motions (VLSMs) in an open channel flow ata Reynolds number of $Re_\tau = 550$. One method of filtering the VLSMs fromthe flow is via artificial domain truncation, which alters the mean particleconcentration profile and particle clustering due to the removal of VLSMs froma large domain simulation. In order to exclude possible correlation of theturbulence introduced by a small domain size with periodic boundary conditions,low- and high-pass filtering is performed during the simulation to isolate theparticle interaction with different spatial scales. The results show thatparticle accumulation and turbophoresis are under-predicted without VLSMs,whereas the particle clustering and two-way coupling effects are mainlydetermined by particle coupling with LSMs. In the inner layer, the elongatedstreamwise anisotropic particle clustering can be reproduced by particlescoupling solely with LSMs for low Stokes number ($St_{LSM}=0.0625$) particles.However, we do not observe similar particle clustering behavior in the outerlayer as seen in the full simulation by coupling particles with either LSMs orVLSMs for high Stokes number ($St_{VLSM}=0.069$) particles. This indicates thatthe organized particle structures are formed by the joint action of LSMs andVLSMs, especially for high Stokes number particles in the outer layer.

Transport and two-way coupling effect of inertial particles by large-scale and very-large-scale motions in turbulence