The incorporation of new equations to extend the applicability of open-source computational fluid dynamics (CFD) software according to the user’s needs must be complemented with code verification and validation with a representative case. This paper presents the development and validation of an OpenFOAM®-based solver suitable for simulating multiphase fluid flow considering three fluid phases with different densities and temperatures, i.e., two miscible liquids and air. A benchmark “dam-break” experiment was performed to validate the solver. Ten thermistors measured temperature variations in different locations of the experimental model and the temperature time series were compared against those of numerical probes in analogous locations. The accuracy of the temperature field assessment considered three different turbulence models: (a) zero-equation, (b) k-omega (Reynolds averaged simulation; RAS), and (c) large eddy simulation (LES). The simulations exhibit a maximum time-average relative and absolute errors of 9.3% and 3.1 K, respectively; thus, the validation tests proved to achieve an adequate performance of the numerical model. The solver developed can be applied in the modeling of thermal discharges into water bodies.

中文翻译：

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多相流的 CFD 模拟：不同温度的混溶液体的相互作用

根据用户的需求加入新方程以扩展开源计算流体动力学 (CFD) 软件的适用性，必须辅以具有代表性案例的代码验证和验证。本文介绍了基于 OpenFOAM® 的求解器的开发和验证，该求解器适用于考虑具有不同密度和温度的三种流体相（即两种可混溶的液体和空气）来模拟多相流体流动。执行基准“溃坝”实验以验证求解器。十个热敏电阻测量了实验模型不同位置的温度变化，并将温度时间序列与类似位置的数值探头的温度时间序列进行比较。温度场评估的准确性考虑了三种不同的湍流模型：(a) 零方程，(b) k-omega（雷诺平均模拟；RAS），和 (c) 大涡模拟 (LES)。模拟的最大时间平均相对误差和绝对误差分别为 9.3% 和 3.1 K；因此，验证测试证明实现了足够的数值模型性能。开发的求解器可用于模拟进入水体的热排放。