Particle resuspension by a periodically-forced impinging jet

Abstract eng:
In this work, we investigate numerically the mechanisms of the dust cloud formation that occurs when a helicopter hovers near the ground. We use a numerical approach that combines Large-eddy simulation of the flow field with Lagrangian particle tracking. The wake generated by the helicopter is modeled as a round impinging jet perturbed by a sequence of periodically forced azimuthal vortices. Particles are initially placed on a thin layer just above the ground. Particle resuspension occurs as the large-scale vortices strike the ground. We characterize statistically the local interaction between the particles and turbulence, as well as the tendency of particles to segregate and concentrate preferentially in specific flow regions. We also clarify the role of the periodic and stochastic fluctuating velocity and vorticity on the inception of particle resuspension.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket