In this paper we present the implementation and the validation of the Diffusion Mixture Model as a valuable alternative to other popular models for the simulation of gas-liquid systems. The Diffusion Mixture Model treats the gas-liquid system as if it consists of only one phase: the gas-liquid mixture. The difference between the Diffusion Mixture Model and others lies in the minor simplification made during its development, since a more accurate approach for evaluating the interactions between the different phases is considered. The method is implemented and tested in OpenFOAM, by using as test case a rectangular bubble column. This study shows the effectiveness of the Diffusion Mixture Model which turns out to be accurate in the description of both global and local properties. This accuracy comes with a cheaper computational cost as the model solves a smaller number of transport equations, when compared with the two-fluid or the multi-fluid models. Moreover, since this version of the Mixture Models has never been studied in detail, we carried out, during the validation, a thorough analysis on all the simplifications that can be implemented, comparing performance improvements in terms of accuracy and computational costs.

在本文中，我们介绍了扩散混合模型的实现和验证，作为其他流行的气液系统模拟模型的重要替代方案。扩散混合模型将气液系统视为仅由一相组成：气液混合物。扩散混合模型与其他模型的区别在于在其开发过程中进行了微小的简化，因为考虑了一种更准确的方法来评估不同相之间的相互作用。该方法在 OpenFOAM 中实现和测试，使用矩形气泡柱作为测试用例。这项研究显示了扩散混合模型的有效性，该模型在描述全局和局部属性方面都是准确的。与双流体或多流体模型相比，这种精度伴随着更便宜的计算成本，因为该模型求解的输运方程数量较少。此外，由于从未详细研究过此版本的混合模型，因此我们在验证期间对所有可以实施的简化进行了彻底分析，比较了准确性和计算成本方面的性能改进。