Unsteady Computational Fluid Dynamics
Modeling Of Free-flight Projectile Aerodynamics
Author(s)
J. Sahu
Abstract
This paper describes a new multidisciplinary computational study undertaken to
model the flight trajectories and the free-flight aerodynamics of both a finned
projectile at supersonic velocities and a spinning projectile at subsonic speeds
with and without aerodynamic flow-control. Actual flight trajectories are
computed using an advanced coupled computational fluid dynamics (CFD)/rigid
body dynamics (RBD) technique. An advanced time-accurate Navier–Stokes
computational technique has been used in CFD to compute the unsteady
aerodynamics associated with the free-flight of the finned projectile at supersonic
speeds and the spinning projectile at subsonic speeds. Computed positions and
orientations of the projectile have been compared with actual data measured
from free-flight tests and are found to be generally in good agreement. Predicted
aerodynamics forces and moments compare well with the forces and moments
used in the six degree freedom fits of the results of the same tests. Unsteady
numerical results obtained from the coupled method show the flow field, the
aerodynamic forces and moments, and the flight trajectories of the projectile.
Keywords: unsteady CFD, projectile aerodynamics, couple CFD/RBD method,
flight trajectory.
1 Introduction
Understanding the aerodynamics of projectiles, rockets, and missiles is critical to
the design of stable configurations and contributes significantly to the overall
performance of weapon systems [1-3]. The prediction of aerodynamic
coefficients for these weapon systems is essential in assessing the performance
of new designs. Numerical simulations have the potential of greatly reducing
design costs while providing a detailed understanding of the complex
Keywords
unsteady CFD, projectile aerodynamics, couple CFD/RBD method,
flight trajectory.
Related Book
Other papers in this volume
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