Study on the underbody flow of the vehicle

—(Report 3: CFD analysis via LES: Case of semi-complex underbody configurations)—

Abstract

   This paper describes large-scale LES computation on the underbody flow with semi-complex underbody configuration using 22-23 million elements. LES results obtained well reproduced the similarity law on energy spectrum in the inertial sub-range, showing applicability of the LES calculations in this study. Difference in flows with flat and semi-complex underbody configurations and effects of moving ground and rotating wheels were clarified. Effects of the underbody configuration on the underbody and wake flows were shown and also CD value calculated was discussed. [This abstract is not included in the PDF]