Multiphase and dynamic CFD analysis in hydraulic turbines

该研究项目与Andritz Hydro Canada Inc.合作，旨在通过发展最先进的计算方法，解决水轮机运行中遇到的四种与设计流量相关的现象的预测问题。本项目研究的四种流动现象是：1)在最佳效率点以上负荷时尾水管采收率突然下降，2)空化引起尾水管压力波动，3)曝气增加溶解氧，4)流固相互作用中的流体动力阻尼和刚度。这四种现象将各自提供应用背景，以支持使用Andritz Hydro提供的实验数据进行模拟方法开发和验证的最先进研究。因此，预计该项目的贡献将包括流动模拟方法的重大发展，从而更好地从现象学角度深入了解涡轮机中的非设计流动状况。该项目将专门开发和验证用于单相流模拟、多相计算流体动力学(CFD)和流固耦合相互作用模拟方法的先进湍流模型。**该项目的目标在于开发先进的模拟方法，以帮助工程师评估针对水力透平机械目前运行的复杂运行条件的设计。通过该项目，5名研究生(3名博士。和2名硕士)将通过具体的工业应用接受最先进的流动模拟方法培训，从而为他们每个人提供深厚的科学知识和高度寻求的工程专业知识。*

This research project, in partnership with Andritz Hydro Canada Inc., aims to tackle the prediction of four off-design flow related phenomena encountered in the operation of hydraulic turbines, through the development of state of the art computational approaches. The four flow phenomena studied in this project are: 1) the sudden drop in the draft-tube recovery factor at loads just above the best efficiency point, 2) cavitation induced draft-tube pressure fluctuations, 3) dissolved oxygen enhancement through aeration, and 4) hydrodynamic damping and stiffness in fluid-structure interaction. These four phenomena will each provide the application context to support state-of-the-art research on simulation method development and validation, using experimental data provided by Andritz Hydro. The contributions of this project are therefore expected to encompass significant developments in flow simulation methods leading to better phenomenological insight into off-design flow conditions in turbines. The project will specifically address the development and validation of advanced turbulence modeling for single-phase flow simulations, multiphase computational fluid dynamics (CFD) and coupled fluid-structure interaction simulation methodologies.**The goal of the project consists in developing advanced simulation approaches to assist engineers in their evaluation of designs for the complex operating conditions in which hydraulic turbomachinery is now operated. Through the project, five graduate students (3 Ph.Ds. and 2 Masters) will be trained in state-of-the-art flow simulation methodologies through concrete industrial applications, thereby providing each of them with deep scientific knowledge and highly sought engineering expertise.****