Longer distances, deeper water, more difficult fluids and cheaper transport solutions are important key words for the future challenges in multiphase pipeline transport of oil and gas. This means that there is a need for more accurate and reliable predictions of multiphase flow. Computational Fluid Dynamics (CFD) allows the prediction of the detailed flow field for virtually all locations within a multiphase flow system, but the results depend crucially on the appropriateness of the turbulence model. In the present study, the commercial CFD code COMET is employed to obtain detailed characteristics of horizontal wavy stratified two-phase flow. The flow is modelled using the volume of fluid (VOF) multiphase model, which allows for the prediction of the shape of the gas-liquid interface. Even though stratified flow is probably the simplest two-phase flow regime, only few studies of stratified two-phase turbulent flow problems have been conducted with the VOF model. So far it has been impossible to predict the detailed characteristics of the flow field, mainly because of the lack of accurate knowledge about the turbulence structure near the gas-liquid interface. The present paper studies and evaluates the capability of two different turbulence models (RNG k-ε and MSST k-ω) to predict stratified two-phase flow. The results have been compared with experimental data. Special attention is given to the turbulence near the gas-liquid interface.

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