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Journal Article

Acceleration statistics of tracer particles in filtered turbulent fields

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Lalescu,  Christian C.
Max Planck Research Group Theory of Turbulent Flows, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Wilczek,  Michael
Max Planck Research Group Theory of Turbulent Flows, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Lalescu, C. C., & Wilczek, M. (2018). Acceleration statistics of tracer particles in filtered turbulent fields. Journal of Fluid Mechanics, 847: R2. doi:10.1017/jfm.2018.381.


Cite as: https://hdl.handle.net/21.11116/0000-0001-94FE-A
Abstract
We present results from direct numerical simulations of tracer particles advected in filtered velocity fields to quantify the impact of the scales of turbulence on Lagrangian acceleration statistics. Systematically removing spatial scales reduces the frequency of extreme acceleration events, consistent with the notion that they are rooted in the small-scale structure of turbulence. We also find that acceleration variance and flatness as a function of filter scale closely resemble experimental results of neutrally buoyant, finite-sized particles, corroborating the picture that particle size determines the scale on which turbulent fluctuations are sampled.