Effect of sharp edges on the unsteady flow and aerodynamic performances of a Boxfish, towards bio-inspired low-drag bluff bodies
Résumé
Several studies have revealed that boxfishes, tropical
fishes living in shallow waters, show exceptional aerodynamic
performances despite their large volume and crosssectional
area. These characteristics make the boxfish
shape an interesting topic of study for drag optimisation
of bluff bodies. This study focuses on the aerodynamic
analysis of several mathematical shape representations of
the boxfish. The effect of the edges is studied since they
are responsible for the generation of vortices, which play
a role in potentially manipulating the wake, resulting in
an overall decrease in the drag coefficient. The effect of
the sharpness or roundness of the edges on the aerodynamic
performance is investigated. Aerodynamic coefficients
are obtained numerically and experimentally for
a range of Reynolds numbers between 3000 and 300000
and at pitch angle from −16◦ to +20◦.
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