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Published: 1993

Total Pages: 129

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The goal of the present investigation is to characterize the instantaneous flow field and force characteristics for a wing/fuselage/pylon/external store system during steady and unsteady flight. Emphasis is placed on practical. cost-effective engineering solution for the short-term treatment of the problem rather than an elegant mathematical modeling for the longer terms. Application of a Nonlinear Vortex Lattice Method (NVLM) Computational Fluid Dynamics (CFD) system with unsteady free wake formulation to obtaining flow field predictions about a maneuvering wing/pylon/store configuration is the primary objective of the current investigation. Separation the external store under the influence of unsteady wake roll up behind wing will be modeled by considering the full mutual interactions between the store and wing/pylon system in the second phase of the project. In this report, preliminary results were presented regarding the unsteady flow field below the wing about the external store and the unsteady aerodynamic forces on the external store before the separation during flight maneuvers. The validation of the computer modeling approach for the maneuvering wing/pylon/store combination needs experimental data. Unfortunately, the comparison experimental data were not available for the current research configuration and conditions. The experimental unsteady wing flow field and stability derivatives literature data was considered as the basis to test the accuracy and effectiveness of the computer code.