Calculation of turbulence-driven secondary motion in ducts with arbitrary cross section

Technical Report · Sat Jul 01 04:00:00 EDT 1989

OSTI ID:5485954

Demuren, A O

Calculation methods for turbulent duct flows are generalized for ducts with arbitrary cross-sections. The irregular physical geometry is transformed into a regular one in computational space, and the flow equations are solved with a finite-volume 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 turbulence-driven 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 rod-bundle 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.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5485954
• Report Number(s): N-89-27115; NASA-TM--102142; ICOMP--89-16; E--4941; NAS--1.15:102142
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ANISOTROPY
DUCTS
ENERGY
FLOW MODELS
FLOW STRESS
FLUID FLOW
KINETIC ENERGY
MATHEMATICAL MODELS
STRESSES
TURBULENT FLOW