Aksoy, M.H.Okbaz, A.Yaǧmur, S.Doǧan, S.2023-03-032023-03-0320231300-1884https://doi.org/10.17341/gazimmfd.1033775https://hdl.handle.net/20.500.13091/3736The aerodynamic forces on road vehicles and flow structures around them result from complex interactions between fluid and structure. Ahmed body is a simplified car model created to demonstrate and simplify the flow around real-size ground vehicles. In this study, the flow structure on the wake region of Ahmed body with different slant angles (Θ=15°, 25°, and 35°) was investigated. Experimental studies were conducted in a water channel by Particle Image Velocimetry (PIV). The freestream velocity was set to 0.2 m/s, and the Reynolds number defined by the characteristic length of the Ahmed body was 4.16×104 for Computational Fluid Dynamics (CFD) and PIV experiments. CFD simulations were performed using three different turbulence models: realizable k-ϵ, RNG k-ϵ, and SST k-ω, and the results were compared to experiments. The results are presented with different flow features such as time-averaged velocity vectors and velocity contours, streamline topology, vorticity, and Turbulence Kinetic Energy. The closest results to the experiments were obtained by the SST k-ω turbulence model for all slant angles of the Ahmed body. In addition, the drag coefficient is found to be 0.37 for all slant angles analyzed by SST k-ω turbulence models, which are also close to the results in the literature. © 2023 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.trinfo:eu-repo/semantics/openAccessAhmed Body, CFD, PIV, simplified road vehicle, flow characteristicsAutomobile bodiesFlow structureKinetic energyKineticsModel automobilesReynolds numberRoads and streetsTurbulence modelsVelocity measurementAerodynamic forcesAhmed bodyAhmed body, computational fluid dynamic, particle image velocimetry, simplified road vehicle, flow characteristicCar modelsFlow characteristicImage velocimetryModel imagesParticle imagesRoad vehiclesVehicle flowComputational fluid dynamicsArticle10.17341/gazimmfd.10337752-s2.0-85146719143