Aerodynamic Characteristics of Low-Fineness-Ratio Freestream-Aligned Cylinders with Magnetic Suspension and Balance System

Unsteady three-dimensional wake structure behind magnetically levitated freestream-aligned circular cylinder

“…The above discussion shows that axisymmetric fluctuations such as bubble pumping are related to the radial position of vortex shedding and the strength of the streak, especially in the low-frequency range, the information is transmitted in the direction of increasing azimuthal wavenumber, which starts with bubble pumping. The large-scale vortex shedding is linked to aerodynamic forces acting in the lateral, pitch and yaw directions of the cylinder, while fluctuations due to bubble pumping are closely related to base pressure (Yokota et al 2021;Kuwata et al 2021;Nonomura et al 2018;Shinji et al 2020). This suggests the possibility of predicting the aerodynamic forces acting in the lateral and rotational directions by measuring base pressure in axisymmetric bodies such as those focused on in the present study.…”

“…The vortex shedding position has been reported to be related to aerodynamic fluctuations in the lateral direction of a freestream-aligned circular cylinder by Yokota et al (2021) and Shinji et al (2020). Therefore, the comprehension of the vortex shedding position is important for suppressing vibrations acting on the cylinder.…”

“…Studies on the freestream-aligned circular cylinder have been conducted both numerically (Johansson & George 2006a,b;Yang et al 2015;Tian et al 2016Tian et al , 2017Gao et al 2018;Prosser & Smith 2016;Chongsiripinyo & Sarkar 2020;Nidhan et al 2020) and experimentally (Higuchi et al 2006(Higuchi et al , 2008Bobinski et al 2014;Shinji et al 2020;Kuwata et al 2021;Yokota et al 2021Yokota et al , 2022Yokota et al , 2023. The flow around the freestream-aligned circular cylinder is classified into two main types based on the time-averaged velocity field.…”

Unsteady large-scale wake structure behind levitated free-stream-aligned circular cylinder

“…This symmetry-broken flow was also observed in the ground-mounted Ahmed model wake (Grandemange et al 2013). The appearance of symmetry-broken modes of RSP and RSB modes in the wake of the free-stream-aligned circular cylinder is expected, but has not been discussed in the studies on the turbulent wake of the cylinder at L/D ≥ 0.3 (Prosser & Smith 2016;Nonomura et al 2018;Shinji et al 2020;Kuwata et al 2021;Yokota et al 2021). The relationship between the characteristic flow structures occurring in the wake and the aerodynamic forces acting on the cylinder has been well discussed in their studies.…”

“…Studies on the free-stream-aligned circular cylinder have been conducted both numerically (Yang et al 2014(Yang et al , 2015Prosser & Smith 2016;Tian et al 2016Tian et al , 2017Gao et al 2018;Nidhan et al 2020) and experimentally (Higuchi et al 2006;Johansson & George 2006a,b;Higuchi, Sawada & Kato 2008;Bobinski, Goujon-Durand & Wesfreid 2014;Shinji et al 2020;Kuwata et al 2021;Yokota et al 2021;. The flow around the free-stream-aligned circular cylinder is classified into two main types based on the time-averaged velocity field.…”