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Time-averaged Three-dimensional Flow Topology In The Wake Of A Simplified Car Model Using Volumetric Piv

Title: Time-averaged Three-dimensional Flow Topology In The Wake Of A Simplified Car Model Using Volumetric Piv.
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Name(s): Sellappan, Prabu, author
McNally, Jonathan, author
Alvi, Farrukh S., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-08-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Fuel shortages and air pollution are two major incentives for improving the aerodynamics of vehicles. Reducing wake-induced aerodynamic drag, which is strongly dependent on flow topology, is important for improving fuel consumption rates which directly affect the environment. Therefore, a comprehensive understanding of the baseline flow topology is required to develop targeted drag reduction strategies. In this research, the near wake of a generic ground vehicle, a slant Ahmed model at a flow Reynolds number of , is investigated and its flow topology elucidated. The flow field of this canonical bluff body is extremely rich, with complex flow features such as spanwise trailing wake and streamwise C-pillar vortices. The flow is characterized through stereoscopic and tomographic velocity field measurements. The large-scale, horseshoe vortex structures in the trailing wake, conventionally denoted as A- and B-vortices, are found to vary in size and shape along the spanwise direction, which in turn influence the pressure distribution on the rear vertical surface. The longitudinal C-pillar vortices are found to extend far downstream and also influence the trailing wake structures through a complex, three-dimensional interaction. The accuracy and cost of obtaining volumetric information in this complex flow field, by means of volume reconstruction, through Stacked Stereoscopic-Particle Image Velocimetry (PIV) and Tomographic PIV are also investigated.
Identifier: FSU_libsubv1_wos_000437789100001 (IID), 10.1007/s00348-018-2581-5 (DOI)
Keywords: simulation, separation, particle image velocimetry, drag reduction, ahmed body, near-wake, rear slant
Publication Note: The publisher’s version of record is available at https://doi.org/10.1007/s00348-018-2581-5
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000437789100001
Owner Institution: FSU
Is Part Of: Experiments in Fluids.
0723-4864
Issue: iss. 8, vol. 59

Choose the citation style.
Sellappan, P., McNally, J., & Alvi, F. S. (2018). Time-averaged Three-dimensional Flow Topology In The Wake Of A Simplified Car Model Using Volumetric Piv. Experiments In Fluids. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000437789100001