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|Title:||A comparison of RANS-based turbulence modeling and PIV experiments for flow over a simplified road vehicle||Other Titles:||Basitleştirilmiş bir karayolu taşiti üzerindeki akiş için RANS tabanli türbülans modellemesi ve PIV deneylerinin karşilaştirilmasi||Authors:||Aksoy, M.H.
|Keywords:||Ahmed Body, CFD, PIV, simplified road vehicle, flow characteristics
Roads and streets
Ahmed body, computational fluid dynamic, particle image velocimetry, simplified road vehicle, flow characteristic
Computational fluid dynamics
|Issue Date:||2023||Publisher:||Gazi Universitesi||Abstract:||The 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.||URI:||https://doi.org/10.17341/gazimmfd.1033775
|Appears in Collections:||Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections|
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checked on Mar 27, 2023
checked on Mar 27, 2023
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