Quasi-static approach of damping forces exerted upon a long cylinder oscillating in an axial flow

Lise Divaret (1, 2) , Julien Berland (1) , Hassan Berro (1) , Olivier Cadot (2) , Olivier Doaré (2) , Pierre Moussou (1)

1 LAMSID - UMR 8193 - Laboratoire de Mécanique des Structures Industrielles Durables
2 UME - Unité de Mécanique

This study investigates the flow around a cylinder in a near-axial flow at a Reynolds number of 27000. Both CFD calculations and experiments are performed. Time-mean values of lift force coefficient are investigated against the inclination of the cylinder in the domain of low inclinations (< 15°). Pressure distribution and flow profiles are also measured and extracted from the CFD calculation results for a characteristic inclination α = 5°. Numerical results for force and pressure show fair agreement with experiments for inclination below 5° and reveal that at low angles, the lift force is proportional to the angle. In the framework of a quasi-static approach, the instantaneous damping force exerted on a cylinder oscillating in axial flow is equivalent to the normal force exerted on a cylinder placed in an oblique flow.

Mots clés: Damping; Axial flow; Cylinders

Domaines: Mécanique [physics]; Mécanique des fluides [physics.class-ph]; Mécanique des structures [physics.class-ph]; Vibrations [physics.class-ph]

Lise Divaret, Julien Berland, Hassan Berro, Olivier Cadot, Olivier Doaré, et al.. Quasi-static approach of damping forces exerted upon a long cylinder oscillating in an axial flow. 2013 ASME Pressure Vessels and Piping Conference, ASME, Jul 2013, Paris, France. ⟨10.1115/PVP2013-97241⟩. ⟨hal-01140849⟩