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Parametric resonant triad interactions in a free shear layer
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Maslowe, S. A. Mallier, R. |
| Copyright Year | 1993 |
| Description | We investigate the weakly nonlinear evolution of a triad of nearly-neutral modes superimposed on a mixing layer with velocity profile u bar equals Um + tanh y. The perturbation consists of a plane wave and a pair of oblique waves each inclined at approximately 60 degrees to the mean flow direction. Because the evolution occurs on a relatively fast time scale, the critical layer dynamics dominate the process and the amplitude evolution of the oblique waves is governed by an integro-differential equation. The long-time solution of this equation predicts very rapid (exponential of an exponential) amplification and we discuss the pertinence of this result to vortex pairing phenomena in mixing layers. |
| File Size | 953655 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940011278 |
| Archival Resource Key | ark:/13960/t6838qm6n |
| Language | English |
| Publisher Date | 1993-10-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Interactional Aerodynamics Shear Flow Perturbation Velocity Distribution Shear Layers Amplification Time Dependence Integral Equations Vortices Differential Equations Flow Distribution Plane Waves Nonlinearity Flow Velocity Free Flow Mixing Layers Fluids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
