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Browsing by Author "Saric, W. S."

Now showing 1 - 4 of 4
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    Compressible Boundary Layers Over Wavy Walls
    Lekoudis, 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.
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    Nonlinear Wave Interactions in Supersonic Wind-Generated Waves
    Lekoudis, 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.
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    Nonparallel Stability of Boundary-Layer Flows
    Saric, W. S.; Nayfeh, Ali H. (AIP Publishing, 1975)
    The spatial stability of two‐dimensional incompressible boundary‐layer flows is analyzed using the method of multiple scales. The analysis takes into account the streamwise variations of the mean flow, the disturbance amplitude, and the wavenumber. The theory is applied to the Blasius and the Falkner–Skan flows. For the Blasius flow, the nonparallel analytical results are in good agreement with the experimental data. The results show that the nonparallel effects increase as the pressure gradient decreases.
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    Third-order resonant wave interactions
    Lekoudis, 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.