Browsing by Author "Lekoudis, S. G."
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- Compressible Boundary Layers Over Wavy WallsLekoudis, S. G.; Nayfeh, Ali H.; Saric, W. S. (AIP Publishing, 1976)An analysis is presented of compressible viscous flows past wavy walls without restricting the mean flow to be linear in the disturbance layer. Linearization of the compressible disturbance equations results in a system of six first_order differential equations for the perturbation quantities. The method of orthonormalization is used to control the error growth in the numerical solution of these equations. The present results agree more closely with experimental data than the results obtained by using Lighthill's theory, which restricts the mean flow to be linear in the disturbance layer.
- Nonlinear Wave Interactions in Supersonic Wind-Generated WavesLekoudis, S. G.; Nayfeh, Ali H.; Saric, W. S. (AIP Publishing, 1982)A nonlinear analysis is presented for the case of second‐harmonic resonant interactions on the interface of a liquid film and a supersonic gas stream. The analysis takes into account the effects of the gas viscosity and mean profiles. Moreover, the extent of the gas disturbance layer is not restricted to the region in which the mean profiles are linear. Self‐sustained oscillations are calculated for low and intermediate liquid Reynolds numbers. The present solution is compared with available experimental data. The predicted and observed wave amplitudes, wavenumbers, and frequencies are in good agreement for intermediate liquid Reynolds numbers. The calculated amplitudes overpredict the observed values by about a factor of three for low liquid Reynolds numbers.
- Third-order resonant wave interactionsLekoudis, S. G.; Nayfeh, Ali H.; Saric, W. S. (AIP Publishing, 1977)An analysis is presented of third_order resonant interactions in capillary-gravity waves. When dissipation is accounted for, the theory predicts the amplitude of the third harmonic near the resonant frequency and at the early stage of the interaction. A more detailed account of the viscous effects is needed when these effects dominate the interaction.