Numerical and Analytical Evaluation Aerodynamic Coefficients of Elongated Bodies with Irregular Shape

Approximate evaluation methods of aerodynamic parameters of the elongated bodies can significantly reduce the time and the cost of developing of new products. One of these methods is the Newton ’s approach for determining of aerodynamic coefficients of the elongated bodies at motion speeds 5...7M by calculating surface integral for aerodynamic visibility of a body. The main difficulty in the implementation of Newton’s approach is determination of the boundary scope of elongated bodies. Enable automatic algorithm of the border of visibility zone over a wide range of angle-of-attack rotation is proposed. In accordance to this algorithm surface of the elongated body is represented analytically as a set of surfaces (plane, spherical, cylindrical, conical, folded, etc.) which are being covered by a grid of triangular elements. For surfaces with an unknown zone of visibility this fact is defined for each bin: first by criterion of geometrical shadow and in positive case then it is tested no overlap of each element by all surfaces constituting the body. Using the developed algorithm it were calculated the aerodynamic coefficients of cylindric-shaped elongated body with folded aft body. Comparison of these results with results of resource-intensive computation using the finite-volumetric solver implemented in the software package FlowSimulation are in good agreement.

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