Strouhal numbers associated with the drag crisis
Year: 2025
Type: article
Abstract: The supercritical Strouhal and critical Reynolds numbers associated with the drag crisis of circular cylinders in cross-flow are known to be dependent on surface roughness and turbulence levels. To better understand the role of free-stream turbulence, we consider the traditional model of oscillating lift forcing together with a randomly fluctuating disturbance associated with fluid turbulence. To the extent that these two components are additive, statistically independent, and Gaussian, we are able to derive a closed-form expression describing the relationship between the effective shedding rate and free-stream turbulence. A semi-empirical model of the critical Reynolds number accounting for fluid turbulence is also presented.
DOI: 10.1063/5.0250747
Author: Dave Bartran
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409905797