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Published online by Cambridge University Press: 26 April 2006
Besonant interactions in flows over rigid and flexible walls are studied. Attention is concentrated on symmetric, three-dimensional wave triads as proposed by Craik (1971). Location of resonant triads and evaluation of interaction coefficients are performed numerically, for a wide range of Reynolds numbers and wavenumbers, considering the temporal stability problem. Good agreement is found with previous work. It is shown that triads comprising various combinations of Tollmien-Schlichting and/or wall modes are possible, and have some interesting features; also, the possibility of interaction with Squire modes must not be overlooked.