抄録
In the field of safety analysis of nuclear reactors horizontal stratified flows with a free and wavy surface are relevant for the injection of cold water into the hot leg. For the numerical simulation of these flows the momentum exchange term and the two-fluid Reynolds stresses of the two-fluid equations have to be closed. In this work a phase interaction model, modeling the momentum exchange, is derived which correlates the waviness of the surface flow with local turbulence quantities. The result provides a two phase layer with a thickness depending on the underlying physics. To close the phase interaction an extended k-ω model is introduced to take account of the two-fluid Reynolds stresses. The turbulence is damped at the free surface with an additional two phase turbulence damping term. The phase interaction model and the k-ω model are compared with experimental results for supercritical flow conditions gained in the WENKA test facility. The partially reversed flow conditions are compared both with the k-ω model and the k-ε model.
