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Acceleration statistics of tracer and light particles in compressible homogeneous isotropic turbulence
Published online by Cambridge University Press: 03 February 2022
Abstract
The accelerations of tracer and light particles (bubbles) in compressible homogeneous isotropic turbulence are investigated by using data from direct numerical simulations up to turbulent Mach number $M_t =1$. For tracer particles, the flatness factor of acceleration components,
$F_a$, increases gradually for
$M_t \in [0.3, 1]$. On the contrary,
$F_a$ for bubbles develops a maximum around
$M_t \sim 0.6$. The probability density function of longitudinal acceleration of tracers is increasingly skewed towards the negative value as
$M_t$ increases. By contrast, for light particles, the skewness factor of longitudinal acceleration,
$S_a$, first becomes more negative with the increase of
$M_t$, and then goes back to
$0$ when
$M_t$ is larger than
$0.6$. Similarly, differences among tracers and bubbles appear also in the zero-crossing time of acceleration correlation. It is argued that all these phenomena are intimately linked to the flow structures in the compression regions close to shocklets.
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- © The Author(s), 2022. Published by Cambridge University Press
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