Loading...
Please wait, while we are loading the content...
Boundary-layer receptivity and integrated transition prediction
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Choudhari, Meelan Chang, Chau-Lyan |
| Copyright Year | 2005 |
| Description | The adjoint parabold stability equations (PSE) formulation is used to calculate the boundary layer receptivity to localized surface roughness and suction for compressible boundary layers. Receptivity efficiency functions predicted by the adjoint PSE approach agree well with results based on other nonparallel methods including linearized Navier-Stokes equations for both Tollmien-Schlichting waves and crossflow instability in swept wing boundary layers. The receptivity efficiency function can be regarded as the Green's function to the disturbance amplitude evolution in a nonparallel (growing) boundary layer. Given the Fourier transformed geometry factor distribution along the chordwise direction, the linear disturbance amplitude evolution for a finite size, distributed nonuniformity can be computed by evaluating the integral effects of both disturbance generation and linear amplification. The synergistic approach via the linear adjoint PSE for receptivity and nonlinear PSE for disturbance evolution downstream of the leading edge forms the basis for an integrated transition prediction tool. Eventually, such physics-based, high fidelity prediction methods could simulate the transition process from the disturbance generation through the nonlinear breakdown in a holistic manner. |
| File Size | 1385507 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050051581 |
| Archival Resource Key | ark:/13960/t00053n89 |
| Language | English |
| Publisher Date | 2005-01-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Thermodynamics Stability Green's Functions Direct Numerical Simulation Compressible Boundary Layer Navier-stokes Equation Incompressible Flow Numerical Analysis Swept Wings Subsonic Flow Tollmien-schlichting Waves Nonlinearity Boundary Layer Transition Prediction Analysis Techniques Leading Edges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
