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Mixing in a stratified shear flow: energetics and sampling
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Briggs, D. A. Ferziger, J. H. Ivey, G. N. Koseff, J. R. |
| Copyright Year | 1993 |
| Description | Direct numerical simulations of the time evolution of homogeneous stably stratified shear flows have been performed for Richardson numbers from 0 to 1 and for Prandtl numbers between 0.1 and 2. The results indicate that mixing efficiency R(sub f) varies with turbulent Froude number in a manner consistent with laboratory experiments performed with Prandtl numbers of 0.7 and 700. However, unlike the laboratory results, for a particular Froude number, the simulations do not show a clear dependence on the magnitude of R(sub f) on Pr. The observed maximum value of R(sub f) is 0.25. When averaged over vertical length scales of an order of magnitude greater than either the overturning or Ozmidov scales of the flow, the simulations indicate that the dissipation rate epsilon is only weakly lognormally distributed with an intermittency of about 0.01 whereas estimated values in the ocean are 3 to 7. |
| File Size | 439798 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940007839 |
| Archival Resource Key | ark:/13960/t1jh8gc0z |
| Language | English |
| Publisher Date | 1993-01-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Turbulence Prandtl Number Turbulent Flow Computational Fluid Dynamics Energy Dissipation Shear Flow Mixing Length Flow Theory Computerized Simulation Froude Number Richardson Number Stratified Flow 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 |
