Flow instability in obstructed channel flow

Title
Flow instability in obstructed channel flow
Authors
양경수
Keywords
Obstructed channel flow Flow-induced force Primary instability Floquet stability analysis Three-dimensional instability
Issue Date
2013
Publisher
COMPUTERS & FLUIDS
Series/Report no.
COMPUTERS & FLUIDS; vol.84 startpage 301 endpage 314
Abstract
Flow instability in a channel obstructed by an infinite array of equi-spaced circular cylinders has been numerically studied. An immersed boundary method was employed to facilitate the placement of the cylinders within a Cartesian grid system. This flow configuration is relevant to a heat exchanger in which vortex generators play an important role in enhancing its heat-transfer capacity. The presence of the circular cylinders arranged periodically in the streamwise direction causes a significant topological change of the flow, leading to increasing susceptibility to flow instability. A parametric study has been carried out to investigate the effects of Reynolds number (Re) and the gap (G) between the cylinders and the channel wall not only on the primary instability for Hopf bifurcation, but also on the secondary instability leading to three-dimensional flow. The blockage ratio (d/H) and the distance between two neighboring cylinder centers were fixed as 0.2 and 3.333H, respectively, w
URI
http://dx.doi.org/10.1016/j.compfluid.2013.06.003
http://dspace.inha.ac.kr/handle/10505/31406
ISSN
0045-7930
Appears in Collections:
College of Engineering(공과대학) > Mechanical Engineering(기계공학) > Journal Papers, Reports(기계공학 논문, 보고서)
Files in This Item:
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