A method for automatic generation of a computational flowfield grid around complex aerodynamic geometries has been presented. The grid-generation time is extremely fast, and there is no user interaction required. A validation of the method dealing with successively refined grids has shown a desired improvement of predicted loads and surface pressure distributions. The application of the method to a complex aerodynamic geometry has shown the results were in good agreement with experiment. Also the potential to deal with a moving geometry has been demonstrated. There are certain deficiencies of the present method, however, which require further consideration. In its present form the method can not resolve sharp trailing edges, and there are an excessive number of cells required to resolve small geometry features. The ability to allow changes of cell size in relation to geometry features is a natural development that the unstructured nature of the cells will allow. Also within the unstructured framework, flow feature adaptation is an extension that will be pursued. To deal with sharp trailing edges in a general, automatic manner requires further development, and at this stage no optimal method is evident. Another consideration is how to generate and ensure an efficient placement of high aspect ratio cells around the geometry for viscous calculations. Directional subdivision of cells is an option, but this is limited to features that align with a coordinate direction. Further work on high aspect ratio cells is required if the method is to treat viscous flows.


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    Title :

    Automatic grid generation and flow solution for complex geometries


    Additional title:

    Automatische Netzgenerierung und Lösungen für die Umströmung komplexer Flügelprofile


    Contributors:

    Published in:

    AIAA Journal ; 34 , 6 ; 1120-1124


    Publication date :

    1996


    Size :

    5 Seiten, 16 Bilder, 14 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English