Computation of laminar and turbulent flow in 90-degree square-duct and pipe bends using the Navier-Stokes equations. Final report 1 Mar 81-28 Feb 82
Three-dimensional laminar and turbulent flow within 90-degree bends of strong curvature and both circular and square cross section are studied by numerical solution of the compressible Reynolds-averaged Navier-Stokes equations. The governing equations are expressed in a body-fitted orthogonal coordinate system and then solved using a consistently-split linearized block implicit (LBI) algorithm. The turbulence model and computational mesh provides for resolution of the viscous sublayer and employs an isotropic eddy viscosity based on solution of the turbulence kinetic energy equation and a specified length scale. Six different flow cases are considered , and the developing flow structure and its dependence on geometric and flow parameters is examined. The computed results are compared with available experimental measurements, and the sequence of comparisons helps to establish the accuracy with which these flows can be predicted by the present method using moderately coarse grids (approx = 10,000 points).
- Research Organization:
- Scientific Research Associates, Inc., Glastonbury, CT (USA)
- OSTI ID:
- 6729368
- Report Number(s):
- AD-A-114258/7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DUCTS
LAMINAR FLOW
TURBULENT FLOW
PIPES
ACCURACY
ALGORITHMS
BOUNDARY LAYERS
COMPRESSIBLE FLOW
EXPERIMENTAL DATA
MATHEMATICAL MODELS
NAVIER-STOKES EQUATIONS
THEORETICAL DATA
THICKNESS
VISCOSITY
DATA
DIFFERENTIAL EQUATIONS
DIMENSIONS
EQUATIONS
FLUID FLOW
INFORMATION
LAYERS
MATHEMATICAL LOGIC
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
420400* - Engineering- Heat Transfer & Fluid Flow