Abstract
Flow around a square cylinder in oscillatory flow was studied by a numerical simulation using a finite-volume method. The computations were carried out by assuming 3-dimensional (3-d), unsteady, incompressible and viscous flow through Keulegan-Carpenter number (KC) in the range of 2.5 ? KC ? 25 at Stokes number (β) = 95. The region in KC ? 4, “longitudinal vortex pairs” periodically arranged in span-direction were found out as well as in the case of circular cylinder. On the other hand, KC ? 5, the flow patterns called “transverse-vortex street”, “double-pair” which appeared in the case of the circuler cylinder at KC =12 and KC =16, respectively, were not formed. The drag and inertia coefficients of the Morison equation CD and CM, were estimated and it was found that decreasing of CD as KC increases in the region 2.5 ? KC ? 12 is caused by the change in the position of rolling up of the flow in the wake. By calculating spanwise correlation, the effect of 3-D flow structures on the transvers force were investigated. The effect remarkably appears in the range of 2.5 ? KC ? 8 in which the “longitudinal vortex pairs” are formed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.