Studies of structure and modeling in turbulent shear flows
Abstract
Several issues connected with turbulence and its modeling were studied using the results of full simulations of homogeneous turbulent flows. It was found that the mechanism of turbulence production in homogeneous sheared turbulence resembles the mechanism of the turbulence production in the mixing layer. It appears that it is possible to fit a wide range of shear flows, which have greatly different physical behavior, with a single turbulence model. A study of length scales used in turbulence modeling revealed that they are dependent on Reynolds number and the ratio of production to dissipation. Model parameters need to be different for each class of flow -- sheared turbulence, plane strain, and axisymmetric strain flows. A principal recommendation resulting from this study is that full turbulence simulations should be used when feasible for the purpose of studying both the physics of turbulence and turbulence modeling. Combination of simulation data with experimental data would be even more desirable. Development of new methods of investigating the data should be encouraged.
- Publication:
-
Final Report
- Pub Date:
- December 1984
- Bibcode:
- 1984neri.rept.....F
- Keywords:
-
- Axisymmetric Flow;
- Mathematical Models;
- Shear Flow;
- Shear Properties;
- Deformation;
- Dissipation;
- Homogeneous Turbulence;
- Length;
- Mechanical Properties;
- Mixing Layers (Fluids);
- Oceanography;
- Production;
- Reynolds Number;
- Simulation;
- Structural Analysis;
- Turbulence Models;
- Turbulent Flow;
- Fluid Mechanics and Heat Transfer