An introduction to the modelling of turbulence
Abstract
Turbulent flow models are reviewed. A turbulent flow can be obtained under the following conditions: at moderate Reynolds numbers the restraining effects of viscosity are too weak to prevent small, random disturbances in a shear flow from amplifying; the disturbances grow, become nonlinear and interact with neighboring disturbances; this mutual interaction leads to a tangling of vorticity filaments; the flow reaches a chaotic, nonrepeating form describable only in statistical terms. Direct numerical simulations of turbulent shear flows, based on time dependent Navier-Stokes equations, are discussed. Mathematical and physical statements on forming turbulent transport equations are summarized. Velocity distribution and heat and mass transports in turbulent flows are overviewed.
- Publication:
-
VKI An Introduction to Modeling Turbulence
- Pub Date:
- 1993
- Bibcode:
- 1993VIMT.....Q....L
- Keywords:
-
- Navier-Stokes Equation;
- Turbulence Models;
- Turbulent Flow;
- Flow Velocity;
- Heat Transfer;
- Mass Flow Rate;
- Reynolds Number;
- Shear Flow;
- Velocity Distribution;
- Viscosity;
- Fluid Mechanics and Heat Transfer