Generating An Aerodynamic Model For
Projectile Flight Simulation Using Unsteady Time
Accurate Computational Fluid Dynamic Results
Author(s)
J. Kokes, M. Costello & J. Sahu
Abstract
A method to efficiently generate a complete aerodynamic description for
projectile flight dynamic modeling is described. At the core of the method is an
unsteady, time accurate computational fluid dynamics simulation that is tightly
coupled to a rigid body dynamics simulation. A set of n short time snippets of
simulated projectile motion at m different Mach numbers is computed and
employed as baseline data. For each time snippet, aerodynamic forces and
moments and the full rigid body state vector of the projectile are known. With
time synchronized air loads and state vector information, aerodynamic
coefficients can be estimated with a simple fitting procedure. By inspecting the
condition number of the fitting matrix, it is straight forward to assess the
suitability of the time history data to predict a selected set of aerodynamic
coefficients. To highlight the merits of this technique it is exercised on example
data for a fin stabilized projectile. The technique is further exercised for a fin
and spin stabilized projectile using simulated data from a standard trajectory
code.
Keywords: projectile, flight dynamics, aerodynamic coefficients, CFD.
1 Introduction
There are roughly four classes of techniques to predict aerodynamic forces and
moments on a projectile in atmospheric flight: empirical methods, wind tunnel
testing, computational fluid dynamics simulation, and spark range testing.
Empirical techniques aerodynamically describe the projectile with a set of
Keywords
projectile, flight dynamics, aerodynamic coefficients, CFD.
Related Book
Other papers in this volume
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