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 beta = 650 000 and 1 250 000 point to drag coefficients about twice those appropriate to two-dimensional laminar flow, in common with earlier measurements at beta nearly equal 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.
Hydrodynamic damping of a cylinder at beta nearly equal 106
Hydrodynamische Schwingungsdämpfung eines Zylinders bei Stokes-Parametern in der Größenordnung von 10<sup>6</sup>
Journal of Fluids and Structures ; 14 , 8 ; 1101-1117
2000
17 Seiten, 10 Bilder, 3 Tabellen, 12 Quellen
Article (Journal)
English
Kreiszylinderumströmung , instationäre Strömung , mechanische Schwingung , Schwingungsdämpfung , Hydrodynamik , Widerstandskoeffizient , ortsfeste Plattform , strömungstechnische Kennzahl , Schwingungsanregung , Welle (Meer) , Querströmung , experimentelle Untersuchung , stehende Welle , Wasserkanal
Hydrodynamic Damping of a Circular Cylinder Oscillating At Small Amplitudes
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