Store Trajectory Response to Unsteady Aerodynamic Loads

Modern weapons bay environments coupled with a trend toward lighter and less stable weapon designs give rise to the potential for extreme sensitivity to flow-field unsteadiness. Ultimately, what is needed is a tool or a functional relationship which will allow bay/store combinations which exhibit this sensitivity to be identified easily. To this end, Digital Fusion Solutions, Inc. proposes the following as a Phase I SBIR effort: -To use OVERFLOW2 to assess the degree that unsteadiness in the flow-field can affect the motion of a store. -To use OVERFLOW2 to generate “grid” data similar to that in wind-tunnel testing with the exception that the flow history will be recorded. Mean aerodynamic coefficients will be extracted as well as a database of perturbations to that mean at each location. -To modify a 6-DOF code which utilizes a table look-up routine so the database of perturbations can be sampled Monte-Carlo style in an effort to simulate unsteadiness. -To demonstrate the usefulness of the modified 6-DOF as a predictive tool for parametric studies of store separations. In the Phase II follow-on, the modified 6-DOF would then be used for investigating the existence of the functional relationships described above.