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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

MODELLING TURBULENT FILM FLOW

pages 217-222
DOI: 10.1615/TSFP2.1100
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RESUMO

Turbulence in the vicinity of a zero mean-shear gas-liquid interface is considered using low-Reynolds-number second-moment closure modelling. Near-boundary damping is achieved by elliptic relaxation, which has proved to be particularly amenable to mimic the turbulence anisotropy near solid surfaces. A modification of the elliptic relaxation formulation and the accompanying length scale is proposed to improve the behaviour of the redistribution term in the vicinity of the free surface without deteriorating its wall characteristics. The new formulation is verified against DNS data of channel flow and experiments on film flow. The wall-friction dependence on Reynolds number is compared with experimental data, a mixing-length formulation, the Launder & Sharma k-ε model and Durbin's k-ε-v2 model. The full Reynolds stress model and the k-ε-v2 model compare most favourably with the experimental results.

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