Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/3736
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.
Okbaz, A.
Yaǧmur, S.
Doǧan, S.
Keywords: Ahmed Body, CFD, PIV, simplified road vehicle, flow characteristics
Automobile bodies
Flow structure
Kinetic energy
Kinetics
Model automobiles
Reynolds number
Roads and streets
Turbulence models
Velocity measurement
Aerodynamic forces
Ahmed body
Ahmed body, computational fluid dynamic, particle image velocimetry, simplified road vehicle, flow characteristic
Car models
Flow characteristic
Image velocimetry
Model images
Particle images
Road vehicles
Vehicle flow
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
https://hdl.handle.net/20.500.13091/3736
ISSN: 1300-1884
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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