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Three-Dimensional Numerical Modeling of Large-Scale Free Surface Flows with Heat and Contaminant Transfer in Reservoirs
Advances in Civil Engineering ( IF 1.8 ) Pub Date : 2021-09-10 , DOI: 10.1155/2021/9336868
Wei Diao 1 , Hao Yuan 2 , Liang Chen 3 , Xujin Zhang 2 , Cunze Zhang 2
Affiliation  

The temperature distribution and pollutant distribution in large reservoirs have always been a hotspot in the field of hydraulics and environmentology, and the three-dimensional numerical modeling that can effectively simulate the interactions between the temperature fields, concentration fields, and flow fields needs to be proposed. The double-diffusive convection lattice Boltzmann method is coupled with a single-phase volume of fluid model for simulating heat and contaminant transfer in large-scale free surface flows. The coupling model is used to simulate the double-diffusive natural convection in a cubic cavity and the temperature distribution of a model reservoir. The mechanism of convection-diffusion, gravity sinking flow, and the complexity of the temperature and the pollutant redistribution process are analyzed. Good agreements between the simulated results and the reference data validate the accuracy and effectiveness of the proposed coupling model in studying free surface flows with heat and contaminant transfer. At last, the temporal and spatial variations of flow state, water temperature stratification, and pollutant transport in the up-reservoir of a pumped-storage power station are simulated and analyzed by the proposed model. The obtained variations of the flow field agree well with the observations in the physical model test and in practical engineering. In addition, the simulated temperature field and concentration field are also consistent with the general rules, which demonstrates the feasibility of the coupling model in simulating temperature and pollutant distribution problems in realistic reservoirs and shows its good prospects in engineering application.

中文翻译:

水库中具有传热和污染物转移的大规模自由表面流动的三维数值模拟

大型水库的温度分布和污染物分布一直是水力学和环境学领域的研究热点,需要提出能够有效模拟温度场、浓度场、流场相互作用的三维数值模型。 . 双扩散对流格子玻尔兹曼方法与单相体积流体模型相结合,用于模拟大规模自由表面流中的热量和污染物传递。耦合模型用于模拟立方腔内的双扩散自然对流和模型储层的温度分布。分析了对流扩散机理、重力下沉流、温度和污染物再分布过程的复杂性。模拟结果与参考数据之间的良好一致性验证了所提出的耦合模型在研究具有热量和污染物传递的自由表面流动方面的准确性和有效性。最后,利用所提出的模型对抽水蓄能电站上水库水流状态、水温分层和污染物运移的时空变化进行了模拟分析。获得的流场变化与物理模型试验和实际工程中的观察结果非常吻合。此外,模拟的温度场和浓度场也符合一般规律,
更新日期:2021-09-10
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