How tracer particles sample the complexity of turbulence
| Autor: | Michael Wilczek, Cristian Lalescu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Particle statistics Field (physics) Turbulence Fluid Dynamics (physics.flu-dyn) General Physics and Astronomy Reynolds number FOS: Physical sciences Mechanics Physics - Fluid Dynamics 01 natural sciences 010305 fluids & plasmas law.invention Physics::Fluid Dynamics symbols.namesake law Intermittency 0103 physical sciences Range (statistics) symbols Particle Vector field 010306 general physics |
| Popis: | On their roller coaster ride through turbulence, tracer particles sample the fluctuations of the underlying fields in space and time. Quantitatively relating particle and field statistics remains a fundamental challenge in a large variety of turbulent flows. We quantify how tracer particles sample turbulence by expressing their temporal velocity fluctuations in terms of an effective probabilistic sampling of spatial velocity field fluctuations. To corroborate our theory, we investigate an extensive suite of direct numerical simulations of hydrodynamic turbulence covering a Taylor-scale Reynolds number range from 150 to 430. Our approach allows the assessment of particle statistics from the knowledge of flow field statistics only, therefore opening avenues to a new generation of models for transport in complex flows. |
| Databáze: | OpenAIRE |
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