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Turbulent separated flow past a backward-facing step: a critical evaluation of two-equation turbulence models
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Speziale, C. G. Thangam, S. |
| Copyright Year | 1991 |
| Description | The ability of two-equation models to accurately predict separated flows is analyzed from a combined theoretical and computational standpoint. Turbulent flow past a backward facing step is chosen as a test case in an effort to resolve the variety of conflicting results that were published during the past decade concerning the performance of two-equation models. It is found that the errors in the reported predictions of the k-epsilon model have two major origins: (1) numerical problems arising from inadequate resolution, and (2) inaccurate predictions for normal Reynolds stress differences arising from the use of an isotropic eddy viscosity. Inadequacies in near wall modelling play a substantially smaller role. Detailed calculations are presented which strongly indicate the standard k-epsilon model - when modified with an independently calibrated anisotropic eddy viscosity - can yield surprisingly good predictions for the backstep problem. |
| File Size | 1043056 |
| Page Count | 30 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910012138 |
| Archival Resource Key | ark:/13960/t48q0xh4f |
| Language | English |
| Publisher Date | 1991-02-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Reynolds Stress Isotropy Flow Equations Turbulent Flow Error Analysis Computational Fluid Dynamics Anisotropy Wall Flow K-epsilon Turbulence Model Separated Flow Backward Facing Steps Eddy Viscosity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
