Scale effects when investigating wave-induced in-line forces on a cylinder horizontally placed near the bottom
Conference
·
OSTI ID:237928
- Univ. of Hannover (Germany). Franzius Inst.
- Univ. of La Rochelle (France). Lab. d`Etude des Phenomenes de Transfert Appliques au Batiment
The aim of this study is to understand the influence of scale effects on in-line forces exerted on a smooth cylinder in waves for a number of different gaps between the cylinder and the bottom of the test facility. On one hand, tests were made in the Laboratoire de Mecanique des Fluide in the University of Le Havre. The wave flume has the dimensions 11 m x 0.8m x 1m, and the cylinder had a diameter D = 0.02 m; the Reynolds numbers (Re) and the Keulegan-Carpenter numbers (KC) came to 1,800 and 4.9 respectively. On the other hand, tests were carried out in the Franzius-Institut, University of Hanover. The Large Wave Flume (GWK) in Hannover is 325 m long, 7 m deep and 5 m wide. The measurements of in-line forces were performed with a cylinder of a diameter D = 0.8 m. The Reynolds numbers (Re) and the Keulegan-Carpenter numbers (KC) were 0.68 10{sup 6} and 4.25 respectively. In this paper the results of both the investigations made in Le Havre and in Hannover are compared with each other. The drag coefficient C{sub D} and the inertia coefficient C{sub M} were calculated from the forces recorded.
- OSTI ID:
- 237928
- Report Number(s):
- CONF-950604--; ISBN 1-880653-18-4
- Country of Publication:
- United States
- Language:
- English
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