Efficiency of quadratic turbulence models application for separated flows simulation in technological aggregates
Annotation
The numerical simulation of quasi-steady two-dimensional separated turbulent flow of incompressible gas in channel behind rearward-facing step in two-dimensional array is carried out. High-Reynolds number and Low-Reynolds number quadratic k-ε turbulence models are applied. Simulation results and experimental data fit properly. For both variants of calculation almost identical velocity and kinetic turbulent energy profiles in cross-sections of channel, pressure distribution along upper and lower walls, length of recirculation zone have been attained. However, for Low-Reynolds number model significant overestimation of skin-friction coefficient is observed, time and computational resource requirements being also increased. Thus for separated flows calculations in technological unite High-Reynolds number quadratic k-ε turbulence model is to be recommended.
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