This technical paper presents an application of the GEneralized TwO Phase flow (GENTOP) model for phase transfer and discusses the submodels used. Boiling of a heated surface under atmospheric conditions is simulated by the multifield computational fluid dynamics (CFD) approach. Subcooled water in a generic pool is heated up first in the near-wall region leading to the generation of small bubbles. Farther away from the bottom wall, larger bubbles are generated by coalescence and evaporation. The CFD simulation is based on the recently developed GENTOP concept. It is a multifield model using the Euler-Euler approach, and it allows the consideration of different local-flow morphologies, including transitions between them. Small steam bubbles are handled as dispersed phases, while the interface of large gas structures is statistically resolved. The multiscale simulation of the transitions from small bubble to larger structures during boiling in a pool is now feasible. However, the GENTOP submodels need a constant improvement and a separate, intensive validation effort using CFD-grade experiments.

本技术论文介绍了通用的TwO相流（GENTOP）模型在相转移中的应用，并讨论了所用的子模型。通过多场计算流体动力学（CFD）方法模拟了大气条件下受热表面的沸腾。普通水池中的过冷水首先在近壁区域被加热，导致产生小气泡。远离底壁，聚结和蒸发会产生较大的气泡。CFD仿真基于最新开发的GENTOP概念。它是使用Euler-Euler方法的多场模型，并且允许考虑不同的局部流形态，包括它们之间的过渡。小的蒸汽气泡被视为分散相，而大的气体结构的界面在统计学上得到了解析。现在可以对池中沸腾期间从小气泡到较大结构的过渡进行多尺度模拟。但是，GENTOP子模型需要不断改进，并需要使用CFD级实验进行单独的深入验证工作。