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A new time scale based k-epsilon model for near wall turbulence
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Yang, Z. Shih, T. H. |
| Copyright Year | 1992 |
| Description | A k-epsilon model is proposed for wall bonded turbulent flows. In this model, the eddy viscosity is characterized by a turbulent velocity scale and a turbulent time scale. The time scale is bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using this time scale and no singularity exists at the wall. The damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+). Hence, the model could be used for flows with separation. The model constants used are the same as in the high Reynolds number standard k-epsilon model. Thus, the proposed model will be also suitable for flows far from the wall. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data. |
| File Size | 775076 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920023624 |
| Archival Resource Key | ark:/13960/t18m2738m |
| Language | English |
| Publisher Date | 1992-09-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer High Reynolds Number Damping Low Reynolds Number Turbulence Turbulent Flow Computational Fluid Dynamics Skin Friction Reynolds Number Turbulent Boundary Layer Velocity Distribution Eddy Viscosity Pressure Gradients Incompressible Flow Dissipation Wall Flow Shear Stress K-epsilon Turbulence Model Channel 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 |
