The structure of a 3D flow with local turbulence in the branching juncture of a circular-section channel
The paper presents the results of a computational and experimental studies of a flow with local turbulence in the branching juncture of a channel with a round cross-section for the inlet Reynolds number Re = 1475 and for equal flow rates in two branches. The numerical solution of the problem has been obtained by the LES technique using the Germano – Lilli dynamic model for estimating the subgrid viscosity. The experiment used the SIV method. The calculated and experimental data in agreement showed that a jet-flow zone and a recirculation one were distinguished in the flow, directly in the branching juncture both in the forward and in the side channels. Turbulent stresses were significant in magnitude only in the channel section about four gauges long. Downstream, the flow in both channels was relaminarized.