Open AccessOpenFOAM for Francis Turbine Transients
Author(s) -
Saeed Salehi,
Håkan Nilsson
Publication year - 2021
Publication title -
openfoam journal
Language(s) - English
Resource type - Journals
ISSN - 2753-8168
DOI - 10.51560/ofj.v1.26
Subject(s) - francis turbine , turbine , transient (computer programming) , computer science , solver , computational fluid dynamics , smoothing , hydropower , flexibility (engineering) , mechanical engineering , control theory (sociology) , engineering , aerospace engineering , mathematics , electrical engineering , statistics , control (management) , artificial intelligence , computer vision , programming language , operating system
The flexibility and fast responsiveness of hydropower systems make them a reliable solution to overcome the intermittency of renewable energy resources and balance the electrical grid. Therefore, investigating the complex flow fields during such operation is essential to increase the reliability and lifetime of future hydropower systems. The current article concerns the utilization of OpenFOAM for the numerical study of Francis turbines during transient load change operations. The details of employed models and numerical schemes are thoroughly explained. The Laplacian smoothing algorithm is applied for the deformation of the guide vane domain. The impact of different mesh diffusivity parameters on both load rejection and acceptance operations is studied. It is shown that general slip boundary conditions cannot be used for slipping points on the guide vane upper and lower surfaces. Instead, different alternatives are introduced and compared. The developed framework is tested on a high-head Francis turbine. Different transient operations are simulated and results are compared to the experimental data. It is shown that OpenFOAM can be employed as a trustworthy CFD solver for numerical investigation of Francis turbines transient operations.