Far-Field Drag Decomposition for Unsteady Flows.
Résumé
Far-field decomposition methods are among the most powerful means to accurately compute the forces on an aircraft. They allow distinguishing between the drag components associated with the various physical phenomena: shock waves, viscous interactions and lift-induced vortex, without yet being fit to apply to unsteady configurations. Van der Vooren and Destarac have for example developed a powerful and reliable method used widely in the industry but restricted to steady flows. This paper presents a generalization to unsteady flows of this formulation. The demonstration relies on a strong theoretical background and allows the breakdown of drag into the three usual components only. This new unsteady formulation is applied to an OAT15A profile with buffeting, then to a NACA0012 profile at high angle of attack with natural vortex shedding. The results are analyzed and compared to the only other formulation available to break down the drag of unsteady flows.
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