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Missile aerodynamic coefficients accuracy assessment by semi empirical aerodynamic prediction codes and CFD Code FLUENT6
Slobodan Mandić Milan Milošević Srđan Stojković
Aerodynamic coefficients of the normal force and the pitching moment obtained by three programs (DMAC, NLMAC and FLUENT6) are compared with experimental data from the wind tunnel for three characteristic missile configurations. DMAC program is designed for the calculation of aerodynamic coefficient derivatives and it is based on semiempirical data. NLMAC program is based on the method of the equivalent angle of attack. The program calculates aerodynamic coefficients as a function of the angle of attack for a specified Mach number and control deflections. FLUENT6 is a solver for three-dimensional general transport equations of mass, momentum and energy. It is based on the finite volume method. General transport equations are derived and applied to each cell. There is a good agreement between the calculated value of aerodynamic coefficients and the experimental data.
Key words: aerodynamics, computational fluid dynamics, derivatives of aerodynamic coefficients, method of the equivalent angle of attack.
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