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为了利用商用CFD(Computational Fluid Dynamics)软件强大的前后处理功能和通用的模型以提高水库水温预测水平,通过定制FLUENT软件实现了水库水温的多维预测.先重点讨论了浮力传热湍流、水面热交换和库容变化动网格的模型和定制问题;然后用美国陆军工程师团水道试验站的水库重力下潜流实验资料验证了该预测模型的正确性并分析水库水温分层的形成机理;最后,对某实际水库水温分层结构进行预测分析,结果显示该水库水温在平水年全年均处于分层状态,建库后下泄水温全年最大温差减小,从而证明了该预测方法的有效性和实用性.“,”To promote the development of reservoir water temperature prediction by taking advantage of the convenient preprocessing and postprocessing and versatile models of commercial CFD(Computational Fluid Dynamics)software, a multidimensional prediction approach of reservoir water temperature is proposed based on customizing software FLUENT. First, the models and customization methods of the thermally buoyant flow model, free-surface heat transfer model and the moving mesh scheme for varying water levels are presented. Then, the approach is validated by comparing results with those of a model reservoir experiment of the U. S. Army Engineer Waterways Experiment Station on thermal-stratified flow and the forming mechanism of reservoir water termperature delamination is analysed. Finally, the method is applied to predict the water temperature structure of an actual huge reservior. Results of the simulation indicate that,the delamination of water temperature exists for the whole year, and the maximum difference in temperature minishes after the dam was built. It is shown that this method is effective and practicable.