Calculation of turbulencedriven secondary motion in ducts with arbitrary crosssection
Abstract
Calculation methods for turbulent duct flows are generalized for ducts with arbitrary crosssections. The irregular physical geometry is transformed into a regular one in computational space, and the flow equations are solved with a finitevolume numerical procedure. The turbulent stresses are calculated with an algebraic stress model derived by simplifying model transport equations for the individual Reynolds stresses. Two variants of such a model are considered. These procedures enable the prediction of both the turbulencedriven secondary flow and the anisotropy of the Reynolds stresses, in contrast to some of the earlier calculation methods. Model predictions are compared to experimental data for developed flow in triangular duct, trapezoidal duct and a rodbundle geometry. The correct trends are predicted, and the quantitative agreement is mostly fair. The simpler variant of the algebraic stress model procured better agreement with the measured data.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1990
 Bibcode:
 1990aiaa.meetU....D
 Keywords:

 Computational Fluid Dynamics;
 Ducts;
 Finite Volume Method;
 Reynolds Stress;
 Turbulence Models;
 Turbulent Flow;
 Anisotropy;
 Flow Velocity;
 Kinetic Energy;
 Predictions;
 Fluid Mechanics and Heat Transfer