Quasi-Steady Simulations for the Efficient Generation of Static Aerodynamic Coefficients at Subsonic Velocities

Abstract

Abstract : A quasi-steady sweep procedure that allows determination of the static aerodynamic coefficients for a range of angles of attack in a single simulation is extended to subsonic Mach numbers. Given a steady-state solution, the procedure can be used to generate multiple numerical simulations over a select range of angles of attack for a given set of flight conditions using the time-accurate Reynolds-Averaged NavierStokes equations. Computational Fluid Dynamics simulations are completed for a canard-controlled, fin-stabilized projectile at Mach 0.65 for a moderate range of angles of attack using a quasi-steady sweep procedure. Separate steady-state solutions are also computed at various angles of attack for comparison. Comparison of the results showed that the quasi-steady sweep procedure can provide accurate static aerodynamic coefficients efficiently if convergence at each time step is ensured.