Evaluating Unsteady Fluid Dynamic Forces in Viscous Flows from the Vorticity Field

The vortex force map (VFM) method is a promising low-cost technique for predicting unsteady aerodynamic load from the vorticity field. Developed under potential flow assumption and applied to high-resolution computational fluid dynamics (CFD) data, original VFM needs be further explored viscous flows, especially at low Reynolds numbers with incomplete knowledge of data. In this paper, extended general both forces contributed in flowfield on body surface considered. We find that viscosity contributes not only skin-friction but also pressure term. show maps problems without lead vanishing contributions far-field. CFD flowfields starting cylinder NACA0012 airfoil, it used analyze contribution effect given vortex. Moreover, acceptable accuracy truncated domains coarse sampling typical particle image velocimetry measurement size demonstrated.