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.


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    Title :

    Hydrodynamic damping of a cylinder at beta nearly equal 106


    Additional title:

    Hydrodynamische Schwingungsdämpfung eines Zylinders bei Stokes-Parametern in der Größenordnung von 10<sup>6</sup>


    Contributors:

    Published in:

    Publication date :

    2000


    Size :

    17 Seiten, 10 Bilder, 3 Tabellen, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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