Aerodynamic Drag Characteristics of a NearGround FishShaped Bluff Body

Abstract:

By using wind tunnel test and numerical simulation, the aerodynamic drag performance of a nearground fishshaped bluff body originated from ostracion cubicus was studied. The results indicate that the nearground bluff body is actually low aerodynamic drag, whose characteristic is determined by the large boattailing angle of the model and the relatively simple vortex structure in the wake. Compared with the CD, Cp and wake structure captured by the simulation and test, the most accurate prediction for the aerodynamic performance is achieved by using the SST turbulence model.

Key words:aerodynamics of vehicles; low aerodynamic drag; ostracion cubicus; flow mechanism