A boundary layer computational model for predicting the flow and heat transfer in sudden expansions
Abstract
Fully developed turbulent and laminar flows through symmetric planar and axisymmetric expansions with heat transfer were modeled using a finitedifference discretization of the boundarylayer equations. By using the boundarylayer equations to model separated flow in place of the NavierStokes equations, computational effort was reduced permitting turbulence modeling studies to economically carried out. The continuity and momentum equations were solved in a coupled matter. For laminar constant property flow, the equations were nodimensionalized so that the solution was independent of Reynolds number. Two different dependent hydrodynamic variable sets were tried: the primitive variable set (uv), and the streamwise velocity steam function variable set (upsi). The predictions of the boundarylayer equations for parameters associated with the trapped eddy compared well with the predictions of the NavierStokes equations and experimental measurements for laminar isothermal flow.
 Publication:

Ph.D. Thesis
 Pub Date:
 December 1985
 Bibcode:
 1985PhDT.......143L
 Keywords:

 Heat Transfer;
 Hydrodynamics;
 Laminar Flow;
 Turbulent Boundary Layer;
 NavierStokes Equation;
 Prediction Analysis Techniques;
 Reynolds Stress;
 Fluid Mechanics and Heat Transfer