NAVIER-STOKES PREDICTION OF PITCH DAMPING COEFFICIENTS FOR PROJECTILES

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Authors
  1. Lesage, F.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A new numerical technique for the prediction of the pitch-damping coefficient has recently been developed in the United States. It is based on the observation that the forces and moments acting on a projectile undergoing coning motion, when viewed from the projectile reference frame, can be related to the pitch damping coefficient in the inertial reference frame. The objective of this memorandum is to present the results of the implementation of this method with the TASCflow Navier-Stokes software at DREV. This document presents a review of the theory which describes how the pitch damping coefficient sum (Cmq + Cma) can be obtained form CFD steady state calculations of a projectile undergoing a coning motion, and how the individual pitch damping terms (Cmq and Cma) can be obtained from calculations of projectiles undergoing helical motions. The TASCflow CFD software is described. This code has a rotating reference frame capability which is necessary to simulate these types of flow. Pitch damping coefficient sums and individual pitch damping terms were calculated using two projectile geometries, the Army-Navy Spinner Rocket and the CAN4 projectile. Good agreements between the results of this study and published numerical and experimental results indicated that the method developed is effective in giving accurate predictions.
Keywords
Computational fluid dynamics;Pitch damping coefficients;TASCflow;Coning motion;Steady state
Report Number
DREV-TM-9717 — Technical Memorandum
Date of publication
01 Nov 1997
Number of Pages
40
DSTKIM No
98-00142
CANDIS No
506823
Format(s):
Hardcopy;Document Image stored on Optical Disk

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