Abstract
The method of matched asymptotic expansions is used to explain bow the triple deck structure in a boundary layer can be formed. In the context of a laminar steady flow of an incompressible fluid over a flat plate, a theory is developed to explain the separation over significant wall disturbances. In particular, we show that the triple deck structure is the first perturbation that can both displace the classical boundary layer and cause separation of the flow. Above this exist a serie of perturbations, smaller but “stronger”, that cause a separation of the boundary layer without displacing it. This serie is limited by the smallest perturbation compatible with the hypothesis of the theory, thus leading to a theory in double deck.
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