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Oweis GF, Ceccio SL (2005) Instantaneous and time averaged flow fields of multiple vortices in the tip region of a ducted propulsor. Niklas KJ, Molina-Freaner F, Tinoco-Ojanguren C (1999) Biomechanics of the columnar cactus pachycereus pringlei. Morgenthal G, Walther JH (2007) An immersed interface method for the vortex-in-cell algorithm. Liu YZ, Shi LL, Yu J (2011) TR-PIV measurements of the wake behind a grooved cylinder at low Reynolds number. Lim HC, Lee SJ (2002) Flow control of circular cylinders with longitudinal grooved surfaces. Kwon K, Choi H (1996) Control of laminar vortex shedding behind a circular cylinder using splitter plates. ASME 2008 International Mechanical Engineering Congress and Exposition (IMECE2008), Boston, Massachusetts, USA, PIV Measurements in the Wake of a Cactus Shaped Cylinder. Karaki W, Abboud J, Daher N, Osman M, Oweis G (2008). In: Proceedings AMSE 29th International Conference Ocean, Offshore & Arctic Eng OMAE2010, June 2010, Shanghai, China Model test on drag of cylinders with helical grooves at high Reynolds numbers. Hodge C (1991) All about saguaros, Arizona Highways Publisher: Phoenix. Han D, Mungal MG (2003) Simultaneous measurements of velocity and CH distributions. Geller GN, Nobel PS (1984) Cactus ribs: influence on PAR interception and CO2 uptake. Theory and design of mechanical measurements. J Fluid Mech 136:321–374ĭjeridi H, Braza M, Perrin R, Harran G, Cid E, Cazin S (2003) Near-wake turbulence properties around a circular cylinder at high Reynolds number. Ann Rev Fluid Mech 23:65–79Ĭantwell B, Coles D (1983) An experimental study of entrainment and transport in the turbulent near wake of a circular cylinder. 035112 doi: 10.1063/1.2887982īearman PW, Harvey JK (1993) Control of circular cylinder flow by the use of dimples. Aerodynamic loads on cactus-shaped cylinders at low Reynolds numbers. 12–15Īpelt CJ, West GS, Szewczyk AA (1973) The effects of wake splitter plates on the flow past a circular cylinder in the range 10 4 < R < 5 × 10 4. 36th Aerospace Sciences Meeting and Exhibit, Reno, Nevada, Jan. 094502Īmitay M, Smith BL, Glezer A (1998) Aerodynamic flow control using synthetic jet technology. Particle image velocimetry measurements in the wake of a cactus-shaped cylinder. Lastly, a simplistic analysis is described to recover, qualitatively, certain time-dependent flow features from the randomly acquired PIV realizations.Ībboud JE, Karaki WS, Oweis GF (2011). The flow within the surface grooves reveals counter rotating rollers, while the geometrical ridges act as vortex generators known to help with the surface flow attachment. At higher Re, the cactus wake exhibits superior behavior as seen from the mean and turbulent velocities, suggesting that the flow mechanisms are Re dependent. At the lowest Re tested, the wakes from the two geometries are similar. The wake flow is analyzed and compared to a similarly sized circular cylinder. Particle image velocimetry is used to investigate the flow details within the surface grooves and in the immediate wake of a cactus-inspired model cylinder with eight longitudinal grooves, at biologically relevant Reynolds numbers between 50 × 10 3 and 170 × 10 3. The star-shaped cross section of giant cylindrical cactus plants is thought to be aerodynamically favorable for protection against toppling by strong winds.