A new model for the pressure/scalar-gradient correlation and its application to homogeneous and inhomogeneous free shear flows
Abstract
A new model is developed for the pressure/scalar- gradient correlation applied to homogeneous flows that shows marked improvements on earlier models. The model is extended to inhomogeneous shear flows by adding a transport equation for the shear dissipation rate of scalar variance and applied to the self-preserving plane and axisymmetric jets. While the plane jet is accurately predicted, the round jet gives a too rapid rate of spread of the thermal field due to the levels of lateral heat flux being too large. Explorations suggest that the pressure/scalar variance model is to blame, and if so, the results highlight the need for thermal data in other than simple shear flows to guide model development.
- Publication:
-
7th Symposium on Turbulent Shear Flows, Volume 2
- Pub Date:
- 1989
- Bibcode:
- 1989tsf.....2...17C
- Keywords:
-
- Free Flow;
- Mathematical Models;
- Pressure Gradients;
- Scalars;
- Shear Flow;
- Correlation;
- Prandtl Number;
- Schmidt Number;
- Transport Properties;
- Turbulent Flow;
- Fluid Mechanics and Heat Transfer