A new model for the pressure/scalargradient 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 selfpreserving 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