泰晤士河水务公司在其运营区域内拥有200多个净化水库。这些水库位于配电网的不同位置，用于维持下游的水压，并作为紧急情况下的蓄水库。人们一直担心，这些构筑物内的混合不良可能会导致水质恶化。本文讨论了计算流体力学（CFD）工具，用于分析储层中的流动动力学和研究储层混合。人们提出了各种参数模型来模拟混合。它们将储层表示为一系列完整的混合罐或多个相互作用的区域。 然而，很难找到适合一类储层的参数模型，因此模型使用的参数必须针对每个储层单独确定。本文的结果是使用商业CFD Fluent程序获得的。可以应用两种CFD方法，即流体体积法（VOF）和变形差法（DM）。VOF方法是一种多相方法，用于模拟适用于空气和水的单速度场。使用空气/水体积分数显式模拟水面。DM方法只模拟水相，水位变化被模拟为移动的平壁边界。 由于计算时间的显著改善，DM方法是首选方法。在随后的模拟中使用DM方法来讨论储层混合性能。对两种方法进行比较，以检查DM方法中假设的有效性。

Thames Water has over 200 treated water reservoirs within its operational area. These reservoirs, found at various locations in the distribution network, are used to maintain the water pressure downstream and to act as storage for emergencies. There has been concern that poor mixing within these structures may contribute to water quality deterioration. This paper discusses the computational fluid dynamics (CFD) tool to analyze the flow dynamics in the reservoir and to study the reservoir mixing. Various parametric models have been proposed to model the mixing. They represent the reservoir either as a series of complete mixed tanks or as a number of interacting zones. However, it is difficult to find a parametric model that would fit to a class of reservoirs and so the parameters used by the model must be determined individually for each reservoir. The results in this work are obtained using the commercial CFD Fluent code. Two CFD methods, the Volume of Fluid (VOF) and the deforming mess (DM) can be applied. The VOF method is a multiphase method and is used to simulate single velocity field applying for both air and water. The water surface is modelled explicitly using the air/water volume fraction. The DM method models the water phase only, the variation of water level is modelled as the moving flat wall boundary. The DM method is preferred because of the significant improvement of the computation time. The DM method is used in subsequent simulations to discuss the reservoir mixing performance. Comparison between the two methods is performed to check for the validity of the assumptions in the DM method.