Numerical Study on Aerodynamic Drag Reduction of Racing Cars

Numerical study of multiple-channel diffusers on the rear bus body

“…The fluid is standard air with constant properties, where μ=1.7894e-05 kg/m-s and ρ=1.225 kg/m3. The simulation was carried out at Reynolds number 2.19x10 6 (based on bus length and inlet velocity). The outlet of the boundary was set to outflow.…”

“…Hu, et.al [5] perform a numerical study about diffuser with some parameter such as diffuser angle, number, and separator design. Hassan, et.al [6] were reported to perform numerical study in modification under the rear body of the vehicle and exhaust gas redirection. Jowsey and Passmore [7] conducted an experimental study on the diffuser and multiple-channel performance using force and pressure measurement with some variation in diffuser angle and ride height.…”

Effect of Various Aerodynamic Drag Reduction Methods on Vehicle- A Review

“…Pressure mesurement showed that strong suction is formed at the intersection of the tapered rear surface and the flat roof and bodyside, which affect both drag and lift. Rear underbody slicing and under body diffuser S.M.Rakibul Hassan [7] has worked on exclusive aspect evaluation of aerodynamic drag of racing cars and exclusive drag reduction strategies reminiscent of rear beneath physique modification and exhaust gas redirection towards the rear separation zones. Through a numerical process (Finite Volume Method) of solving the Favre-averaged Naiver-Stokes equations.…”

A Novel Shape-Adjustable Surface and Its Applications in Car Design

“…In their research in 2014 [29], they used the large eddy simulation method on two CAD models with full details; they drew the conclusion that the vortex shed from the A-pillar edge results in a destabilizing tendency while the vortex shed from the C-pillar edge results in a stabilizing tendency. Hassan et al [30] reduced the drag coefficient by nearly 10% by optimizing the angle of departure and the shape of the Rear body diffuser in a racing car CAD model. In the study from Chen et al [31] on the influence of various eddy viscosity turbulence models on the CFD simulations of a particular racing car type, they also pointed out that the shape of some specific surfaces (i.e., backlight-decklid junction, spoiler base, roof rails, shark-fin) would affect the results of CFD simulation.…”