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Direct simulation of high-speed mixing layers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Drummond, J. Philip Sekar, B. Mukunda, H. S. Carpenter, M. H. Kumar, Ajay |
| Copyright Year | 1992 |
| Description | A computational study of a nonreacting high-speed mixing layer is performed. A higher order algorithm with sufficient grid points is used to resolve all relevant scales. In all cases, a temporal free-stream disturbance is introduced. The resulting flow is time-sampled to generate a statistical cross section of the flow properties. The studies are conducted at two convective Mach numbers, three free-stream turbulence intensities, three Reynolds numbers, and two types of initial profiles-hyperbolic tangent (tanh) and boundary layer. The boundary-layer profile leads to more realistic predictions of the transition processes. The predicted transition Reynolds number of 0.18 x 10(exp 6) compares well with experimental data. Normalized vortex spacings for the boundary-layer case are about 3.5 and compare favorably with the 1.5 to 2.5 found in experimental measurements. The tanh profile produces spacings of about 10. The growth rate of the layer is shown to be moderately affected by the initial disturbance field, but comparison with experimental data shows moderate agreement. For the boundary-layer case, it is shown that noise at the Strouhal number of 0.007 is selectively amplified and shows little Reynolds number dependence. |
| File Size | 3183297 |
| Page Count | 68 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920021665 |
| Archival Resource Key | ark:/13960/t4sj6d450 |
| Language | English |
| Publisher Date | 1992-07-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Turbulence Free Wing Aircraft Reynolds Number Strouhal Number Flow Characteristics Computerized Simulation Convection Algorithms Vortices Computational Grids Mixing Layers Fluids Boundary Layers Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
