Demonstration of a Transonic Box Method for Unsteady Aerodynamics of Planar Wings PDF Download

Author: J. J. Olsen
Publisher:
ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 218

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Book Description
The report presents and interprets the predictions of an unsteady aerodynamic prediction method known as the Sonic Box method. Illustrations are given on how the program interprets input modal data, the program's techniques for smoothing certain input and output data, convergence of the numerical results, and comparisons of predicted results with experiments. It is shown how the present program requires the user to devote some care to defining input mode shapes, however this problem can be removed by a simple modification. Generally speaking, the program's current limit of fifty boxes in any one direction is sufficient to obtain satisfactory convergence, with the exception of pitching moments on cropped deltas. In this respect other modifications are apparent which could improve convergence at the cost of increased complexity. Agreement with experiment was generally qualitatively good, but illustrated the need for further optimization of the method as well as the lack of experimental data of the type and quality desired for correlation. (Author).