Stratified flows are one of the most important multiphase flow regimes for safety analyses of the loss-of-coolant accident in pressurized water reactors. The present paper considers simulations of an isothermal counter-current stratified flow case in the channel of the WENKA (Water Entrainment Channel Karlsruhe) experiment using a morphology adaptive multi-field two-fluid modelling framework. A consistent momentum interpolation approach is applied together with the partial elimination algorithm, as it is required for strong momentum coupling, which enforces the no-slip condition at the interface and mirrors the behaviour of a homogeneous model. To model the turbulent flow conditions near an interface, the framework is extended with a turbulence damping model based on the damping scale formulation from the literature, which is introduced into the k-$\omega$ SST (Shear Stress Transport) turbulence model. The presented modelling approach is validated with experimental data for the pressure difference and vertical profiles of volume fraction, velocity and turbulent kinetic energy. Results of a mesh sensitivity study of the model are presented. Simulations were performed on two- and three-dimensional models of the channel geometry. Two turbulence damping strategies are investigated: symmetric, with damping in both phases, and asymmetric with damping only in the gas phase. The comparison shows that the asymmetric approach offers improved prediction of turbulent kinetic energy on the liquid side of the interface, but with a cost of diminished accuracy of the predicted velocity profiles on the gas side.

分层流是用于压水堆冷却剂损失事故安全分析的最重要的多相流形式之一。本文考虑使用形态学自适应多场两流体建模框架对WENKA（引水通道卡尔斯鲁厄）实验通道中的等温逆流分层流动工况进行模拟。一致的动量插值方法与部分消除算法一起应用，这是强动量耦合所必需的，它可以在界面处强制执行无滑移条件并反映均质模型的行为。为了对界面附近的湍流条件进行建模，基于湍流阻尼模型对框架进行了扩展，该模型基于文献中的阻尼比例公式，并将其引入到模型中。ķ -$\omega$SST（剪切应力传输）湍流模型。所提出的建模方法已通过压力差和体积分数，速度和湍动能的垂直剖面的实验数据进行了验证。给出了模型的网格敏感性研究的结果。在通道几何的二维和三维模型上进行了仿真。研究了两种湍流阻尼策略：对称的，在两个相中都具有阻尼，以及不对称的，仅在气相中都具有阻尼。比较表明，非对称方法可以改善界面液侧湍动能的预测，但会降低气体侧预测速度分布的准确性。