In this paper fluid dynamics simulations have been executed using a CFD (Computational Fluid Dynamics) commercial code, on a Maserati Biturbo Mod. 222-1988.The aerodynamics resistance results are given under the form of aerodynamics penetration coefficient CD, taking into account the vehicle shape effect, the speed, the fluid properties and the orientation. In the beginning, simulations were executed with the purpose of obtaining the aerodynamics resistance according to the geometric configuration of some surfaces. These simulations also furnished the pressure distribution on the vehicle surfaces, and wake conformation; in all the cases a better configuration than the initial one was found, with a reduction of the aerodynamic resistance coefficient of some percent. The result of simulation is in very good accordance with the empirical White method. Two different vehicle configurations were found: the first having a minimum value of aerodynamic resistance, the other deriving from a careful manual study of the stream lines around the vehicle. A better result was obtained in the second case: The superposition of optimum particulars does not ensure the best result because a certain solution can influence the geometric configuration of other vehicle parts in a different way. It demonstrates the difficulty in the research of the shape, ensuring minimum aerodynamics resistance and the importance of the designer experience. The procedure of automatic optimisation is set creating a loop between a CFD code that executes the simulations and an optimisation module. The procedure permits the geometric configuration determination of the surface, which the minimum value of aerodynamics resistance belongs. A CD reduction equal to 4.2 % with regard to the initial value is obtained, only acting on seven amongst all the control points. A better result can be obtained acting on other surfaces that were not optimised because the resources of hardware and software were limited. The potentialities of this method of automatic optimisation are remarkable if one can realise a better grid and has the possibility of action on a greater number of points; however its application requires hardware resources of high capacities.


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    Titel :

    Optimisation of a vehicle shape by CFD code


    Weitere Titelangaben:

    Optimierung der fahrzeugform mit Hilfe von CFD-Simulationen


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2005


    Format / Umfang :

    16 Seiten, 15 Bilder, 1 Tabelle, 17 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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