Regular Article
HYDRODYNAMIC DAMPING OF A CYLINDER AT β≈106

https://doi.org/10.1006/jfls.2000.0318Get rights and content

Abstract

This paper describes delicate, but large-scale, experiments aimed at measuring the hydrodynamic damping of a circular cylinder oscillating in still water and transversely in a current. Attention is concentrated on the regime of very small Keulegan–Carpenter numbers, in which the drag coefficient is inversely proportional to the Keulegan–Carpenter number. Measurements in still water at β=650 000 and 1250 000 point to drag coefficients about twice those appropriate to two-dimensional laminar flow, in common with earlier measurements at β≈105. In the presence of a slowly varying transverse current (generated by placing the cylinder at the node of standing waves of long period), the damping increased with the reduced velocity of the ambient flow at a rate that increased with the Reynolds number.

References (13)

There are more references available in the full text version of this article.

Cited by (26)

  • Towards a model of hydrodynamic damping for a circular cylinder with helical strakes at low KC

    2021, Marine Structures
    Citation Excerpt :

    Therefore, an accurate prediction of the hydrodynamic damping is essential for the fatigue design of WIRs. The hydrodynamic damping applied to risers has been widely investigated, such as [5–7]. However, it remains unclear what kind of model can best represent the nature of the hydrodynamic damping at low KC (KC = 2πA/D [8], where A is motion amplitude and D is the riser diameter) flow regime, which is of most concern for the fatigue analysis of WIRs.

View all citing articles on Scopus
View full text