Numerical Simulation of Store Separation Trajectory for EGLIN Test Case Using Overset Mesh

摘要

Overset mesh is applied for transient store separation from air vehicles and validated against experimental data from EGLIN test [1]. Traditionally, numerical methods with dynamic mesh (remeshing) are used in simulations for store separation problems, which cuts down the need for expensive and dangerous testing approaches like wind tunnel and flight testing, respectively. However, mesh generation for dynamic mesh is both time-consuming and provides limited control on preserving desired mesh quality during simulation due to remeshing. Overset mesh, with the flexibility for independent mesh generation of individual components, can simplify the mesh generation task. Furthermore, the mesh quality is preserved as the simulation proceeds for general motion, through judicious mesh design. ANSYS Fluent's density based flow solver [2,3] coupled with a six degree of freedom (6-DOF) rigid body dynamic solver is used for solving the compressible flow equations for predicting the projectile motion of the store. A linear exact second order least squares method is used for overset interpolation achieving good agreement with experimental results.