The objective of this paper is to describe the complementary usage of simulation, wind tunnel and road testing during the aerodynamic development of a new SUV. Aerodynamics is the first engineering discipline to assess properties of styling models and is further involved throughout the entire development process. Even before a styling competition starts, various proportion studies are already judged by their potential in terms of drag and lift forces. During the reduction of different design themes up to styling freeze, aerodynamics has a significant impact on the decision which models to drop. In the course of the entire vehicle development process aerodynamics is one of the few disciplines involved from the very early initial phase up to the final serial development. Along this cycle the available data features very different levels of detail. After the kick-off of a new model only generic bodies without underhood and underbody details are provided from styling for the aerodynamic analysis and ranking of different themes. These may be clay models or virtual shapes created with ALIAS. Once the design competition is completed and the exterior skin is frozen, more and more details of the engine compartment and the underbody become available to the aerodynamicist from various other departments. According to the growing maturity of product data also the problems to be addressed are changing. The initial ranking of styling themes with respect to aerodynamic quality is mostly accomplished purely based on drag and lift distribution. However, aerodynamics is closely linked with thermal management and therefore cooling air mass flow rates, performance of the cooling package and component temperatures need to be assessed as soon as the necessary geometry data is available. Another constraint arises from the short time windows in the overall development process in which the aerodynamicist can have an impact on the vehicle. To cope with these tasks the aerodynamicist uses a toolbox consisting of -Simulation (CFD); -Wind Tunnel; -Road Test. At the BMW group these tools are not considered as competing instruments, rather they are used in a complementary fashion. Each tool has its own advantages and drawbacks and therefore only their clever application to the right problem at the right time delivers a real benefit and aids to shorten cost and time. This paper exemplifies this process in detail on the aerodynamic development of a new BMW SUV to be released in autumn 2006.


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    Titel :

    Complementary usage of simulation, wind tunnel and road tests during the aerodynamic development of a new BMW SUV


    Weitere Titelangaben:

    Komplementäre Nutzung von Simulation, Windkanal- und Straßenversuch bei der Aerodynamikentwicklung eines neuen BMW-SUV


    Beteiligte:
    Kerschbaum, Hans (Autor:in) / Grün, Norbert (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    9 Seiten, 12 Bilder, 6 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch





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