TY - JOUR
T1 - Flapping dynamics of an inverted flag in a uniform flow
AU - Ryu, Jaeha
AU - Park, Sung Goon
AU - Kim, Boyoung
AU - Sung, Hyung Jin
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - The flapping motions of an inverted flag in a uniform flow were simulated using the immersed boundary method. The strain energy of the inverted flag was used as an indicator of the energy harvesting system efficiency. The flapping dynamics of and vortical structures around the inverted flag were examined in terms of the bending rigidity (γ) and the Reynolds number (Re). Three flapping motion modes were observed: a deflected mode, a flapping mode, and a straight mode. A mode intermediate between the flapping mode and the straight mode was identified, the biased mode. The vortical structures in the wake were characterized by three modes: a vortex pair; a vortex pair with a single vortex, and two vortex pairs, during half of the flapping period. The maximum mean strain energy (ES) was obtained when the vortical structures behind the inverted flag formed a vortex pair during the flapping mode.
AB - The flapping motions of an inverted flag in a uniform flow were simulated using the immersed boundary method. The strain energy of the inverted flag was used as an indicator of the energy harvesting system efficiency. The flapping dynamics of and vortical structures around the inverted flag were examined in terms of the bending rigidity (γ) and the Reynolds number (Re). Three flapping motion modes were observed: a deflected mode, a flapping mode, and a straight mode. A mode intermediate between the flapping mode and the straight mode was identified, the biased mode. The vortical structures in the wake were characterized by three modes: a vortex pair; a vortex pair with a single vortex, and two vortex pairs, during half of the flapping period. The maximum mean strain energy (ES) was obtained when the vortical structures behind the inverted flag formed a vortex pair during the flapping mode.
KW - Energy harvesting system
KW - Immersed boundary method
KW - Inverted flag
KW - Vortical structures
UR - http://www.scopus.com/inward/record.url?scp=84939793611&partnerID=8YFLogxK
U2 - 10.1016/j.jfluidstructs.2015.06.006
DO - 10.1016/j.jfluidstructs.2015.06.006
M3 - Article
AN - SCOPUS:84939793611
SN - 0889-9746
VL - 57
SP - 159
EP - 169
JO - Journal of Fluids and Structures
JF - Journal of Fluids and Structures
ER -