Numerical Simulation of Turbulent Pipe Flow Through an Abrupt Axisymmetric Constriction

作者：Nygard F^*; Andersson H I

来源：Flow, Turbulence and Combustion, 2013, 91(1): 1-18.

DOI：10.1007/s10494-013-9447-y

• Axisymmetric constriction
• Turbulence
• Immersed boundary method
• Numerical simulation
• Finite differences

Turbulent flow through an abrupt axisymmetric contraction has been investigated in a computational study. The full three-dimensional Navier-Stokes equations have been solved in cylindrical coordinates. The ring-like obstruction was accounted for by an immersed boundary method implemented in an open source code. The results were compared with data from an experimental study and a surprisingly good agreement was found in the separated-flow region downstream of the obstruction. A distinctly higher turbulence level was predicted upstream of the obstruction as compared with the measured data. Due to the imposed streamwise periodicity the simulated configuration mimicked a sequence of equally spaced obstructions and this periodicity gives rise to substantially higher turbulence levels than in a single-ring configuration. Particular attention was paid to the possible occurrence of mean-flow asymmetries, as frequently reported in planar-symmetric configuration. No sign of the Coanda effect was observed in the present study, for which a physical explanation was provided.

• 出版日期2013-7