Hydrodynamic forces acting on a rigid fixed sphere in early transitional regimes

G. Bouchet 1 M. Mebarek 2 J. Dušek 2
1 GEP
IUSTI - Institut universitaire des systèmes thermiques industriels
Abstract : A spectral – spectral-element code is used to investigate the hydrodynamic forces acting on a fixed sphere placed in a uniform flow in the Reynolds number interval [10–320] covering the early stages of transition, i.e. the steady axisymmetric regime with detached flow, the steady non-axisymmetric and the unsteady periodic regimes of the sphere wake. The mentioned changes of regimes, shown by several authors to be related to a regular and a Hopf bifurcations in the wake, result in significant changes of hydrodynamic action of the flow on the sphere. In the present paper, we show that the loss of axisymmetry is accompanied not only by an onset of lift but also of a torque and we give accurate values of drag, lift and torque in the whole interval of investigated Reynolds numbers. Among other results show, moreover, that each bifurcation is accompanied also by a change of the trend of the drag versus Reynolds number dependence, the overall qualitative effect of instabilities being an increase of drag.
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-01447007
Contributor : Gilles Bouchet <>
Submitted on : Thursday, January 26, 2017 - 3:09:49 PM
Last modification on : Saturday, October 27, 2018 - 1:21:04 AM

Identifiers

Citation

G. Bouchet, M. Mebarek, J. Dušek. Hydrodynamic forces acting on a rigid fixed sphere in early transitional regimes. European Journal of Mechanics - B/Fluids, Elsevier, 2006, 25 (3), pp.321 - 336. ⟨10.1016/j.euromechflu.2005.10.001⟩. ⟨hal-01447007⟩

Share

Metrics

Record views

74