Abstract
A hypothesis is made and evidence is given of a spurious far-field-boundary-induced drag component in twodimensional flow numerical solutions, which is of a different nature from irreversible spurious drag. In the case of solutions to the Euler equations, analysis is carried out of its behavior with far-field boundary condition, lift coefficient, computational domain size, uniform grid refinement, far-field grid refinement, and flow regime (subcritical/transonic). Phenomenological breakdown of this drag component is derived through Taylor series expansion. Finally, the concept of far-field-boundary-induced drag is applied to the interpretation of some of the data contained inVassberg and Jameson’s results [Vassberg, J. C., and Jameson, A., “In Pursuit of GridConvergence for Two-Dimensional Euler Solutions,” Journal of Aircraft, Vol. 474, July–Aug. 2010, pp. 1152–1166]. Estimates of this component based on the aforementioned analysis are found to be coherentwith, and to provide insight into, Vassberg and Jameson’s results.
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