Projects per year
Abstract
This article examines numerically the twodimensional fluidstructure interaction problem of a circular cylinder rolling under gravity along an inclined surface under the assumption of a fixed but small gap. The motion of the cylinder is governed by the ratio of cylinder and fluid densities and the Reynolds number based on a velocity scale derived from the momentum balance in the asymptotic regime. For increasing Reynolds number, the cylinder wake undergoes a transition from steady to periodic flow, causing oscillations of the cylinder motion. The critical Reynolds number increases for light cylinders. Whereas the timeaveraged characteristics of the asymptotic rolling states depend only on the Reynolds number, the density ratio has an additional influence on the vibration amplitude and on the cylinder motion during a startup transient from rest. Light cylinders reach their final state quickly after the initial acceleration; heavier cylinders traverse a series of quasisteady states, including a temporary velocity overshoot, before settling in the asymptotic regime. The amplitudes of the flowinduced vibrations remain small over the entire parameter range, which can be attributed to the value of the addedmass force associated with a rolling cylinder. Special attention is paid to the influence of the small but finite gap between cylinder and wall, since lubrication theory predicts a diverging pressure drag for a vanishing gap. The variations with gap size of the forces, torque and added mass are explored. The gap also influences the characteristics of the cylinder vibrations in the unsteady wake regime, in particular their amplitude.
Original language  English 

Article number  A48 
Number of pages  33 
Journal  Journal of Fluid Mechanics 
Volume  903 
DOIs  
Publication status  Published  25 Nov 2020 
Keywords
 Flowstructure interactions
 Wakes
Projects
 2 Finished

The Mechanisms determining the Rolling Motions of Bodies
Hourigan, K., Thompson, M. & Leweke, T.
19/12/20 → 19/12/23
Project: Research

Wake Transitions and FluidStructure Interactions of Rotating Bluff Bodies
Hourigan, K., Lo Jacono, D., Sheridan, J., Thompson, M. & Leweke, T.
Australian Research Council (ARC), Monash University, CNRS  Centre National de la Recherche Scientifique (French National Centre for Scientific Research), Université PaulSabatier (Paul Sabatier University)
1/01/15 → 6/11/18
Project: Research