Journal
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
Volume 72, Issue 1, Pages 18-24Publisher
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/00022660010308633
Keywords
flow; finite element method; inverse problems; aircraft; aerodynamics
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A generalized variational principle of 2D unsteady compressible flow around oscillating airfoils is established directly from the governing equations and boundary/initial conditions via the semi-inverse method proposed by He. In this method, an energy integral with an unknown F is used as a trial-functional. The identification of the unknown F is similar to the identification of the Lagrange multiplier. Based on the variational theory with variable domain, a variational principle for the inverse problem (given as the time-averaged pressure over the airfoil contour, while the corresponding airfoil shape is unknown) is constructed, and all the boundary/initial conditions are converted into natural ones, leading to well-posedness and the unique solution of the inverse problems.
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