Store Separation Analyses by means of Response Surface Modeling
CHALLENGE - Despite the fact that CFD has lowered the number of wind and flight tests, mesh generation and the computational setup still takes significant time. In the present study, one of the well known safe separation test cases, EGLIN Experiment, was simulated using a CFD based Response Surface Modeling.
SOLUTION - The Grid Method which is used in wind tunnel tests and design of experiment methodology are applied. The model has a delta wing, pylon, and finned store. The initial mapping points across the grid domain were obtained using Uniform Latin Hypercube, one of the space filler methods. After getting the CFD results at the pre-defined grid points, RSMs were created to approximate the full aerodynamic database which will be the input for the 6-DoF code. The RSMs that are used in this analysis are created using the optimization platform modeFRONTIER. Store separation problem requires the proper application of flight mechanics discipline for the generation of store trajectory and orientation in space. In this study, commercially available MATLAB/Simulink software package is utilized for this purpose. At the final step, RSMs of 3 forces-3 moments and their output are used as the input of 6-DoF code.
BENEFITS - As a result, the trajectory, attitude, linear velocities and angular velocities of the model were predicted and compared with the experimental data and the results of unsteady CFD analysis. Estimated force values of validation cases by using RSMs are in a good agreement with the computed values by using CFD simulations.