Far-field drag extraction has the advantage over near-field integration of providing a physical breakdown of drag. A decomposition into components linked to shock waves, viscous interactions, and lift-induced vortices is straightforward for steady flows. A formulation based on thermodynamic considerations is used at ONERA-The French Aerospace Lab and by its partners but is restricted to steady cases. Another team made a first attempt in generalizing it to time-dependent flows, but their decomposition still holds terms that cannot be matched with physical phenomena. This paper presents another generalization to unsteady flows of the steady formulation. The proposed method 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 under a buffet condition, then to a NACA0012 profile at a high angle of attack with natural vortex shedding, and finally to a pitching profile. The results are analyzed and compared to the only other formulation available to break down the drag of unsteady configurations. Presented as Paper 2014-2991 at the 32nd AIAA Applied Aerodynamics Conference, Atlanta, GA, 16-20 June 2014
Development and Application of a New Unsteady Far-Field Drag Decomposition Method
AIAA journal ; 53 , 11
2015
Aufsatz (Zeitschrift)
Englisch
Far-Field Drag Prediction and Decomposition Method for Unsteady Flows
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|Development and Application of a New Unsteady Far-Field Drag Decomposition Method (AIAA 2014-2991)
British Library Conference Proceedings | 2014
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