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CFD Transonic Store Separation Trajectory Predictions with Comparison to Wind Tunnel Investigations
Elias E. Panagiotopoulos, Spyridon D. Kyparissis
Pages - 538 - 553     |    Revised - 30-12-2009     |    Published - 31-01-2010
Volume - 3   Issue - 6    |    Publication Date - January 2010  Table of Contents
(ITAE) performance index, PID, Tuning rule, AMIGO
The prediction of the separation movements of the external store weapons carried out on military aircraft wings under transonic Mach number and various angles of attack is an important task in the aerodynamic design area in order to define the safe operational-release envelopes. The development of computational fluid dynamics techniques has successfully contributed to the prediction of the flowfield through the aircraft/weapon separation problems. The numerical solution of the discretized three-dimensional, inviscid and compressible Navier-Stokes equations over a dynamic unstructured tetrahedral mesh approach is accomplished with a commercial CFD finite-volume code. A combination of spring-based smoothing and local remeshing are employed with an implicit, second-order upwind accurate Euler solver. A six degree-of-freedom routine using a fourth-order multi-point time integration scheme is coupled with the flow solver to update the store trajectory information. This analysis is applied for surface pressure distributions and various trajectory parameters during the entire store-separation event at various angles of attack. The efficiency of the applied computational analysis gives satisfactory results compared, when possible, against the published data of verified experiments.
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Dr. Elias E. Panagiotopoulos
Hellenic Military Academy - Greece
Mr. Spyridon D. Kyparissis
University of Patras - Greece