Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 11, 2020 - November 13, 2020
In this study, the pressure field of the flow past a simplified vehicle body with a wheelhouse and a tire is estimated from the velocity data measured by particle image velocimetry (PIV). The pressure field is estimated by solving the Poisson equation for pressure. The three-dimensional velocity field is obtained by reconstructing the time-averaged velocity distributions of multiple cross-sections taken from two orthogonal directions measured by two-dimensional PIV measurements. The experiment is carried out in a water tunnel at a Reynolds number of 12500. The pressure field is first validated by comparing it to a numerical solution. Then, the cause of the longitudinal vortices which have a significant influence on the aerodynamic performance of vehicles is discussed based on the estimated pressure field. The estimated pressure is higher at the front of the tire and lower at the sides of the tire. This result suggests that the longitudinal vortices are caused by the pressure difference around the tire.
