2020 年 5 巻 p. 51-56
In this study, the pressure distribution around a circular cylinder rotating on the ground is estimated from velocity data measured by particle image velocimetry (PIV) using a virtual flux method. The method enables the estimation of the pressure distribution of the flow around an object of arbitrary shape from velocity data on a Cartesian grid measured by PIV.
This method is first validated with synthetic velocity data obtained by computational fluid dynamics. Then, this method is applied to the flow around a circular cylinder rotating on the ground at a Reynolds number of 1000, which has a boundary that cannot be represented on the Cartesian grid. Furthermore, the flows around a stationary circular cylinder and a circular cylinder without ground contact are investigated to understand the effect of rotation and ground contact on the flow. It is found that rotation produces a high pressure in the stagnation region between the cylinder and the ground and clearance from the ground generates an extremely low pressure region between the cylinder and the ground.
