Accession Number : ADA592550


Title :   Numerical Prediction of Pitch Damping Stability Derivatives for Finned Projectiles


Descriptive Note : Final rept. Jan 2011-Jun 2012


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Bhagwandin, Vishal A ; Sahu, Jubaraj


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a592550.pdf


Report Date : Nov 2013


Pagination or Media Count : 52


Abstract : Reynolds-Averaged Navier Stokes computational fluid dynamics and linear flight mechanics theory were used to compute the pitch damping dynamic stability derivatives for two basic finned projectiles using two numerical methods, namely, the transient planar pitching method and the steady lunar coning method. Numerical results were compared to free-flight and wind-tunnel experimental data for Mach numbers in the range 0.5 4.5. The accuracy, efficiency and dependence of these methods on various aerodynamic and numerical modeling parameters were investigated. The numerical methods generally showed good agreement with each other, except at some transonic Mach numbers. Both methods showed good to excellent agreement with experimental data in the high transonic and supersonic Mach regimes. In the subsonic and low transonic regimes, agreement between numerical and experimental data was less favorable. The accuracy of the free-flight test data in these regimes was uncertain due to instances of large scatter, large standard deviation errors and different data sources showing significantly different results.


Descriptors :   *COMPUTATIONAL FLUID DYNAMICS , *DAMPING , *PROJECTILES , ACCURACY , AERODYNAMICS , ERRORS , FREE FLIGHT , MATHEMATICAL MODELS , MATHEMATICAL PREDICTION , NUMERICAL METHODS AND PROCEDURES , PITCH(MOTION)


Subject Categories : Ammunition and Explosives
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE