Laminar flow structures from a rotating sphere: Effect of rotating axis angle

The flow structures of a transversely rotating sphere at high rotation rates

“…where c 0 ¼ À0:6; c 1 ¼ 0:5ðÀx min þ 2c 0 þ 3Þ; c 2 ¼ 0:5ðx min À 2c 0 À 1Þ and x min ¼ 0:2 which is consistent with other recent studies [11,17,18]. In the azimuthal direction, the collocation points were evenly distributed.…”

“…The table shows that there is good agreement between the present results and the published findings. The accuracy of the present grid stretching (12) was also verified against the original stretching (11) employed by co-workers [11,17] at Re ¼ 300 and X Ã ¼ 1:20 in Fig. 3.…”

“…Furthermore, in the code used by Poon et al [17,18] this node spacing is then clustered according to…”

“…3. Comparison of the flow structures, time history of lift coefficients, CLy, and velocity-defect in the near wake between the present grid stretching (12) and the original stretching (11) used by co-workers [11,17].…”

“…Kim [10] has expanded the understanding of this topic to rotations of X Ã ¼ 1:20 and has also found shear layer instability mechanisms at this rotation rate. The study by Poon et al [17,18] revealed that the orientation of the rotation axis also has a significant effect on the flow structure and hydrodynamic forces. In particular, the shear layer instability mechanism reported by Giacobello et al [11] was found at Re ¼ 300 not only for transverse rotation but also for a limited number of oblique rotation axis angles.…”