期刊
OCEAN ENGINEERING
卷 263, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2022.112194
关键词
Cable; Marine growth; Roughness; Drag coefficient; Coral; Mussel
资金
- French National Research Agency under the Investments for the Future program [ANR-10-IEED-0006-28]
- European Union (FEDER)
- French government
- IFREMER [CPER 2015-2020 MARCO]
The presence of marine growth increases the diameter and roughness of submarine structures, resulting in increased hydrodynamic loading. Experimental studies on two types of hard roughness (mussels and corals) were conducted and it was found that the hydrodynamic coefficients of the colonized structures were up to 4 times higher than those of a reference cylinder. Standardizing the inertia and drag coefficients using different specific diameters can simplify the estimation of forces applied on the system.
The presence of marine growth increases submarine structures diameter and roughness and thus the hydrody-namic loading due to wave and current excitation. In this paper, two kinds of hard roughness (mussels and corals) are studied experimentally. In order to cover a wide range of the dimensionless numbers (Reynolds number, Keulegan-Carpenter number and reduced speed), three kind of trials are carried out: current only, forced motions and a combination of forced motions and current. Two equivalent diameters are used for the calculation of the hydrodynamic coefficients: an equivalent diameter corresponding to the closed volume of the system, where no fluid is permitted, and an equivalent diameter based on the projected area of the colonized structure for the drag coefficient, and on the total volume for inertia coefficients. Results show that these coefficients are up to 4 times higher than those obtained for a reference cylinder. The use of a different specific diameter for inertia and drag coefficient leads to fit all results with the reference cylinder results. This standardization prove that the knowledge of the volume and the projected surface of the cylindrical structure could simplify the forces estimation applied on the system just by knowing the corresponding smooth one.
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