FN Archimer Export Format
PT J
TI Experimental study of coherent flow structures past a wall-mounted square cylinder
BT 
AF Ikhennicheu, Maria
   Germain, Gregory
   Druault, Philippe
   Gaurier, Benoit
AS 1:1;2:1;3:2;4:1;
FF 1:PDG-REM-RDT-LCSM;2:PDG-REM-RDT-LCSM;3:;4:PDG-REM-RDT-LCSM;
C1 Ifremer, Marine Structure Laboratory, 150 Quai Gambetta 62200 Boulogne sur Mer, France
   Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 7190, Institut Jean Le Rond d’Alembert, F-75005, Paris, France
C2 IFREMER, FRANCE
   UNIV PARIS 06, FRANCE
SI BOULOGNE
SE PDG-REM-RDT-LCSM
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 3.068
TC 26
UR https://archimer.ifremer.fr/doc/00494/60527/64189.pdf
LA English
DT Article
DE ;Turbulence;Experimental trials;Wall-mounted cylinder;PIV;LDV;POD;Lamb-Oseen
AB In high flow velocity areas like those suitable for tidal applications, turbulence intensity is high and flow variations may have a major impact on tidal turbines behaviour. Large boils that can be observed at the sea surface are emitted from the sea floor and may interact with the tidal turbines. These boils have then to be characterized. The Reynolds number, based on the rugosity height and the mean flow velocity, is rather high in this context: Re ¼ 2:5 107. For that purpose, experiments are carried out in a flume tank with Re as high as achievable in Froude similitude (in the tank: Re ¼ 2:5  105 and Fr ¼ 0:23) in order to study coherent flow structures emitted behind seabed obstacles. The obstacle is here a canonical square wall-mounted cylinder chosen to be representative of specific in-situ bathymetric variations. Using PIV and LDV measurements, the flow past the cylinder is investigated. Using a POD filter, large coherent structures are identified and their trajectories are analysed. By means of a Lamb-Oseen profile approximation, properties of these structures are determined. The formation mechanism of such structures is discussed in this paper and their behaviour is characterized. It is assumed that vortices periodically shed from the obstacle interact and generate hairpin structures. 
PY 2019
PD JUL
SO Ocean Engineering
SN 0029-8018
PU Elsevier BV
VL 182
UT 000474678700013
BP 137
EP 146
DI 10.1016/j.oceaneng.2019.04.043
ID 60527
ER

EF