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Numerical solution of turbulent flow past a backward facing step using a nonlinear k-epsilon model
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Speziale, C. G. Ngo, Tuan |
| Copyright Year | 1987 |
| Description | The problem of turbulent flow past a backward facing step is important in many technological applications and has been used as a standard test case to evaluate the performance of turbulence models in the prediction of separated flows. It is well known that the commonly used kappa-epsilon (and K-l) models of turbulence yield inaccurate predictions for the reattachment points in this problem. By an analysis of the mean vorticity transport equation, it will be argued that the intrinsically inaccurate prediction of normal Reynolds stress differences by the Kappa-epsilon and K-l models is a major contributor to this problem. Computations using a new nonlinear kappa-epsilon model (which alleviates this deficiency) are made with the TEACH program. Comparisons are made between the improved results predicted by this nonlinear kappa-epsilon model and those obtained from the linear kappa-epsilon model as well as from second-order closure models. |
| File Size | 1372882 |
| Page Count | 49 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880005807 |
| Archival Resource Key | ark:/13960/t3tt9hf2r |
| Language | English |
| Publisher Date | 1987-12-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Turbulence Turbulent Flow Transport Properties Reattached Flow Computer Programs Reynolds Stress Numerical Analysis Vorticity Nonlinearity K-epsilon Turbulence Model Models Separated Flow Backward Facing Steps Nonlinear Systems 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 |
