It is well known that drag reduction occurs when the flow is passing by a grooved circular cylinder at certain Reynolds numbers, which has been used as a powerful energy saving method in a broad ra...

https://www.tandfonline.com/doi/pdf/10.1080/19942060.2018.1562382

Application and optimization of drag reduction characteristics on the flow around a partial grooved cylinder by using the response surface method

The star-shaped cross section of giant cylindrical cactus plants is thought to be aerodynamically favorable for protection against toppling by strong winds 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 × 103 and 170 × 103 The wake flow is analyzed and compared to a similarly sized circular cylinder At the lowest Re tested, the wakes from the two geometries are similar 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 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 Lastly, a simplistic analysis is described to recover, qualitatively, certain time-dependent flow features from the randomly acquired PIV realizations

The flow past a cactus-inspired grooved cylinder

The flow field past a cylindrical model with a cactus-shaped cross section is investigated in a wind tunnel. The velocity field in the immediate wake just aft of the cylinder and the surface pressure distribution are measured. The data from the cactus model are compared to a similar model with a circular section. The mean flow patterns have generally a similar form for the two geometries. However, there are differences in the surface pressure distribution and the turbulent velocity levels in the wake.Copyright © 2008 by ASME

PIV measurements in the wake of a cactus shaped cylinder

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PIV measurements in the wake of a cactus shaped cylinder