Laminar separation bubble formation using a circular cylinder rotating adjacent to a flat plate

A new method for the formation of a laminar separation bubble (LSB) on a flat plate was investigated whereby an adverse pressure gradient (APG) was induced by the presence of a rotating cylinder. A parametric study was performed where the rotation rate and gap height (G) was changed to vary the strength of APG which affects the nature and extent of the LSB. Results showed that the height (H), length (L) and the separation point (S) of the LSB varied in conjunction with the strength of the APG and the Re. Time-Resolved Digital Particle Image Velocimetry (TR-DPIV) was used to document the LSB in this water tunnel study. Results captured the effects of changing flow speed, cylinder location and rotation rate on the development of the LSB.