In a typical complex particle flow with turbulence, particles can directly interact with small turbulent eddies. The presence of particles changes the turbulence field, and at the same time, the turbulent eddies also influence the particle motion and coagulation. The problem for this computational study is modeled as a turbulent flow passing over a solid spherical particle. The background turbulence field is first generated using an LES turbulence simulation in a large domain. An improved direct-forcing immersed-boundary method is then used to place a particle in a truncated smaller domain to start the simulation for particle/turbulence interaction. The results show that turbulence causes different patterns of vortex shedding in the wake that appears as turbulent fluctuations. The effect of the particle on the background turbulence is detected in the spectral analysis where the particle removes some turbulent energy at the low frequency range and returns the energy to the frequency range corresponding to vortex shedding.

Volume Subject Area:
Fluids Engineering
Topics:
Particulate matter, Turbulence, Eddies (Fluid dynamics), Simulation, Vortex shedding, Emission spectroscopy, Fluctuations (Physics), Particle flow, Spectroscopy, Wakes
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