FN Archimer Export Format
PT J
TI Experimental analysis of a strong fluid–structure interaction on a soft membrane—Application to the flapping of a yacht downwind sail
BT 
AF DEPARDAY, Julien
   AUGIER, Benoit
   BOT, Patrick
AS 1:1;2:2;3:3;
FF 1:;2:PDG-REM-RDT-LCSM;3:;
C1 Ecole Polytech Federale Lausanne, Inst Mech Engn, UNFoLD, CH-1015 Lausanne, Switzerland.
   IFREMER, Marine Struct Lab, ZI Pointe Diable CS 10070, F-29280 Plouzane, France.
   Naval Acad Res Inst, IRENAV CC600, F-29240 Brest 9, France.
C2 EPFL, SWITZERLAND
   IFREMER, FRANCE
   IRENAV, FRANCE
SI BREST
SE PDG-REM-RDT-LCSM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-int-hors-europe
IF 3.07
TC 9
UR https://archimer.ifremer.fr/doc/00444/55561/60479.pdf
LA English
DT Article
DE ;Fluid structure interaction;Full-scale experiment;Modal decomposition;Pressure measurements;Soft membrane
AB In the present study we investigate the flapping instability of a light, soft, highly cambered membrane subject to wind loading. An original in-situ experiment is developed where time-resolved pressures and forces are measured on a full-scale yacht downwind sail called a spinnaker. Particular features of this aero-elastic problem are that the membrane is weakly constrained – held only at three corners –, has a free leading edge, and has no proper shape in the absence of wind loading. In usual operating conditions, the soft structure is subject to a flapping instability giving rise to almost periodic folding and unfolding of the fore part of the sail, associated to strong variations of pressures and forces. This dynamic behavior is analyzed in detail and the space–time evolution of pressures on the membrane is linked to the flapping phenomenon. A peak in forces is observed when the membrane recovers its full shape. Thanks to the Bi-Orthogonal Decomposition (BOD) applied to the pressure fields, the dynamic behavior is reasonably well represented by the two first modes where mode 1 mostly carries the global aerodynamic force behavior and mode 2 mostly represents the effects of the membrane flapping. A physical mechanism of the flapping process is proposed based on the discussion of aerodynamic pressures and strains in the membrane. 
PY 2018
PD AUG
SO Journal Of Fluids And Structures
SN 0889-9746
PU Academic Press Ltd- Elsevier Science Ltd
VL 81
UT 000440771500029
BP 547
EP 564
DI 10.1016/j.jfluidstructs.2018.06.003
ID 55561
ER

EF