• Login
    View Item 
    •   eScholar Home
    • Faculty of Engineering & Applied Science
    • Master Theses & Projects
    • View Item
    •   eScholar Home
    • Faculty of Engineering & Applied Science
    • Master Theses & Projects
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation

    Thumbnail
    View/Open
    Ghani_Osama_Abdul.pdf (2.276Mb)
    Date
    2013-05-01
    Author
    Ghani, Osama Abdul
    Metadata
    Show full item record
    Abstract
    The rear geometry of a passenger car has the most significant influence on its aerodynamic characteristics. This thesis studied aerodynamic shape optimization of the rear geometry of passenger cars. The Non-uniform rational B-spline (NURBS) curve was used to represent the rear body of a generic passenger car model (the Ahmed Body) and the NURBS parameters were employed for geometry parameterization. These geometry parameters were systematically modified using design of experiments to obtain different geometries of the simplified car model. The computational fluid dynamics (CFD) simulations were performed on these geometries to obtain drag coefficients. Once the results of CFD simulations were available, a response surface model was constructed using linear regression technique. Finally, the design exploration was performed using the response surface model instead of actual CFD simulations. This technique resulted in a radical simplification of the design process as the behaviour of the aerodynamic drag was predicted using a simple polynomial. The proposed methodology was implemented to perform design exploration of a generic fast back model. The response surface model was able to predict the aerodynamic drag coefficients within an error of 5%. Aerodynamic shape optimization was also performed on a generic notch back model using the response surface technique and the optimized geometry parameters for minimum drag were obtained in only 18 iterations. On the basis of the results, it can be concluded that the proposed methodology is inexpensive, simple and robust. It can therefore provide the basic framework for the design and development of low drag passenger cars.
    URI
    https://hdl.handle.net/10155/314
    Collections
    • Electronic Theses and Dissertations [1323]
    • Master Theses & Projects [418]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of eScholarCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV