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research-article

Numerical Investigation of Crossflow Separation on the A-Pillar of a Passenger Car

[+] Author and Article Information
Sabine Bonitz

Vehicle Engineering & Autonomous Systems Department of Mechanics and Maritime Sciences Chalmers University of Technology Gothenburg, Sweden
sabine.bonitz@chalmers.se

Lars Larsson

Marine Technology Department of Mechanics and Maritime Sciences Chalmers University of Technology Gothenburg, Sweden
lars.larsson@chalmers.se

Lennart Löfdahl

Vehicle Engineering & Autonomous Systems Department of Mechanics and Maritime Sciences Chalmers University of Technology Gothenburg, Sweden
lennart.lofdahl@chalmers.se

Simone Sebben

Vehicle Engineering   Autonomous Systems Department of Mechanics and Maritime Sciences Chalmers University of Technology Gothenburg, Sweden
simone.sebben@chalmers.se

1Corresponding author.

ASME doi:10.1115/1.4040107 History: Received October 24, 2017; Revised April 18, 2018

Abstract

The flow around passenger cars is characterized by many different separation structures, typically leading to vortices and areas of reversed flow. The flow phenomena in these patches show a strong interaction and the evolution of flow structures is difficult to understand from a physical point of view. Analyzing surface properties, as pressure, vorticity or shear stress helps to identify different phenomena, but still it is not well understood how these are created. This paper investigates the crossflow separation on the A-pillar of a passenger car, using numerical simulations. It is discussed how the crossflow separation and the resulting A-pillar vortex can be identified as well as how it is created. Additionally, the vortex strength is determined by its circulation, to understand and discuss how the vortex preserves until it merges with the rear wake of the vehicle.

Copyright (c) 2018 by ASME
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