Threedimensional calculation of turbulent duct flow with nonuniform inlet conditions
Abstract
Threedimensional calculations are reported of developing flow in a square duct with nonuniform inlet conditions. The nonuniformity was generated at the entrance of each of four subducts formed by placing a cruciform into developed flow in a larger square duct. A forwardmarching finite difference procedure is used to solve numerically the flow equations, and the turbulent stresses are calculated with an algebraic stress model derived by simplifying model transport equations for the individual stresses. This model, in contrast to isotropic eddy viscosity expressions, allows the simulation of turbulencedriven secondary flows in noncircular ducts. The calculated development of the mean flow and turbulence quantities is generally in good agreement with experimental data. A detailed study of the redevelopment of the secondary motion from the corner flow prevailing in the large duct to the corner flows in the subduct is presented. A genuine feature of the calculations is that they are true predictions as the experimental data became available only after the calculations had been completed.
 Publication:

Computers and Fluids
 Pub Date:
 1987
 Bibcode:
 1987CF.....15...47D
 Keywords:

 Computational Fluid Dynamics;
 Ducted Flow;
 Inlet Flow;
 Nonuniform Flow;
 Three Dimensional Flow;
 Turbulent Flow;
 Corner Flow;
 Finite Difference Theory;
 Flow Equations;
 Shear Stress;
 Fluid Mechanics and Heat Transfer