Wake Visualization Behind Different Vehicle Body Shapes

Wake Visualization Behind Different Vehicle Body Shapes
Authors : Gurjot Kaur
Publication Date: 01-08-2016


Author(s):  Gurjot Kaur

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 5 - Issue. 08 , August - 2016

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV5IS080035


With the increasing fuel prices and more strict requirements in CO2 exhaust levels, it is necessary to reduce the energy consumption of vehicles. Since aerodynamics plays an important role in total driving resistance of vehicles, it is logical step to focus in this area. A large part of the aerodynamic air resistance of vehicles can be contributed to the pressure drag caused by its wake. The problem of Wake visualization in fluid mechanics is of considerable interest, especially the visualization of the complex flows, which is used to verify the existing theories. The flow region which presents the main contribution to a car’s drag, and which poses severe problems to numerical predictions and experimental studies, is the wake flow behind the car. The location where the flow separates decides the extent of the separation zone, and consequently the drag force. When the air passes over the vehicle surface, it causes the air over the surface change its behavior, resulting in a low pressure region and a high pressure region. This pressure difference along with vortex shedding causes drag thereby increases the fuel consumption. Clearly, a more precise simulation of the wake flow and of separation process is essential for the correctness of drag predictions. Three different car models and a bus shape model are used for experiments and Experiments are performed at different angles.


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