Loading...
Please wait, while we are loading the content...
Similar Documents
A new k-epsilon eddy viscosity model for high reynolds number turbulent flows: model development and validation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Shabbir, A. Zhu, J. Yang, Z. Shih, T.-H. Liou, W. W. |
| Copyright Year | 1994 |
| Description | A new k-epsilon eddy viscosity model, which consists of a new model dissipation rate equation and a new realizable eddy viscosity formulation, is proposed. The new model dissipation rate equation is based on the dynamic equation of the mean-square vorticity fluctuation at large turbulent Reynolds number. The new eddy viscosity formulation is based on the realizability constraints: the positivity of normal Reynolds stresses and Schwarz' inequality for turbulent shear stresses. We find that the present model with a set of unified model coefficients can perform well for a variety of flows. The flows that are examined include: (1) rotating homogeneous shear flows; (2) boundary-free shear flows including a mixing layer, planar and round jets; (3) a channel flow, and flat plate boundary layers with and without a pressure gradient; and (4) backward facing step separated flows. The model predictions are compared with available experimental data. The results from the standard k-epsilon eddy viscosity model are also included for comparison. It is shown that the present model is a significant improvement over the standard k-epsilon eddy viscosity model. |
| File Size | 1155218 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950005029 |
| Archival Resource Key | ark:/13960/t8sb9100d |
| Language | English |
| Publisher Date | 1994-08-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer High Reynolds Number Reynolds Stress Turbulent Flow Shear Flow Vorticity Turbulent Boundary Layer Shear Stress K-epsilon Turbulence Model Backward Facing Steps Eddy Viscosity Viscous 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 |
