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Third-moment closure of turbulence for predictions of separating and reattaching shear flows: a study of reynolds-stress closure model
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Goel, P. Amano, R. S. |
| Copyright Year | 1986 |
| Description | A numerical study of computations in backward-facing steps with flow separation and reattachment, using the Reynolds stress closure is presented. The highlight of this study is the improvement of the Reynold-stress model (RSM) by modifying the diffusive transport of the Reynolds stresses through the formulation, solution and subsequent incorporation of the transport equations of the third moments, bar-u(i)u(j)u(k), into the turbulence model. The diffusive transport of the Reynolds stresses, represented by the gradients of the third moments, attains greater significance in recirculating flows. The third moments evaluated by the development and solution of the complete transport equations are superior to those obtained by existing algebraic correlations. A low-Reynolds number model for the transport equations of the third moments is developed and considerable improvement in the near-wall profiles of the third moments is observed. The values of the empirical constants utilized in the development of the model are recommended. The Reynolds-stress closure is consolidated by incorporating the equations of k and e, containing the modified diffusion coefficients, and the transport equations of the third moments into the Reynolds stress equations. Computational results obtained by the original k-e model, the original RSM and the consolidated and modified RSM are compared with experimental data. Overall improvement in the predictions is seen by consolidation of the RMS and a marked improvement in the profiles of bar-u(i)u(j)u(k) is obtained around the reattachment region. |
| File Size | 2617575 |
| Page Count | 91 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870002528 |
| Archival Resource Key | ark:/13960/t13n71s4v |
| Language | English |
| Publisher Date | 1986-09-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Turbulent Flow Computational Fluid Dynamics Shear Flow Reynolds Number Reattached Flow Convergence Shear Layers Reynolds Stress Flow Equations Iterative Solution Turbulence Models Differential Equations K-epsilon Turbulence Model Separated Flow Backward Facing Steps Boundary Layer 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 |
