Dol, S.S.; Wee, S.K.; Yong, T.H.; Sulaiman, S.A. The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence. Fluids2023, 8, 270.
Dol, S.S.; Wee, S.K.; Yong, T.H.; Sulaiman, S.A. The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence. Fluids 2023, 8, 270.
Dol, S.S.; Wee, S.K.; Yong, T.H.; Sulaiman, S.A. The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence. Fluids2023, 8, 270.
Dol, S.S.; Wee, S.K.; Yong, T.H.; Sulaiman, S.A. The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence. Fluids 2023, 8, 270.
Abstract
A rigid protruding surface, agitator and vortex generator often dissipate more energy than to produce a satisfied turbulence production. In contrast, a passively-oscillating flexible protruding surface has the ability in generating greater turbulence level. In the current study, a circular finite cylinder (cantilever) was used as the geometry of the rigid and protruding surface. They were varied through the aspect ratio (AR) and materials. Also, a local Reynolds number within the subcritical flow range (102<ReD<105) was considered. The results from the rigid protruding surface (finite cylinder) is served as a validation to the published results and benchmark to the improve-ment of the turbulence generated by the flexible protruding surface. It was mentioned in the pre-vious work that the increment of turbulence production by the flexible cylinder is speculated to be oscillation, this work investigates the validity of the speculation through manipulating the struc-tural stiffness of the flexible cylinder by employing different materials. The results have further demonstrated that the flexible cylinder is capable of generating a greater turbulence through the examination of turbulence intensity, turbulence production term and Reynolds stress. All the flex-ible cylinders that oscillate show increment in turbulence production but at a different percentage. The cylinders studied in this work ranged from the least structural stiffness (EVA), moderate (al-uminium) to the highest structural stiffness (carbon steel). Through studying the normalized am-plitude responses graph of the flexible cylinder, it is identified that the oscillating motion does in-deed contribute to increment. A further investigation into the results, it is found that the factor which governs the increment is the structural velocity instead of just oscillating motion alone.
Copyright:
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