Francis-99 Workshop 2: transient operation of Francis turbines

Abstract

Francis-99 is a set of workshops jointly organized by the Norwegian University of Science and Technology (NTNU), Norway and Luleå University of Technology (LTU), Sweden in the same spirit as the previous Turbine-99 workshops. The Francis-99 workshops aim to determine the state of the art of high head Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as promote their development and knowledge dissemination openly. Three workshops are initially planned:- Workshop 1: steady operation of Francis turbines (performed in December 2014)- Workshop 2: transient operation of Francis turbines (December 2016)- Workshop 3: FSI of Francis turbines (December 2018)A high head Francis turbine model, named the Tokke model, has been designed and experimentally investigated at the Water Power Laboratory, NTNU. The complete geometry of the model and mesh are now freely available on the site http://www.ntnu.edu/nvks/francis-99 together with a large set of experimental pressure and velocity measurements. The organisers expect this geometry to become with time a reference test case to the hydraulic community for research and development on high head Francis turbines and the workshops a meeting place to discuss developments, potentials, issues… on a common and open test case.The present proceeding contains the papers presented at the second workshop at NTNU the 14th and 15th of December 2015. A total of 10 papers were presented. A large variety of codes and models were used highlighting different issues in the simulation of high Francis turbines.The editors:Prof. Michel J. Cervantes (LTU, NTNU),Dr. Chirag Trivedi (NTNU)Prof O.G. Dahlhaug (NTNU)Prof. T. Nielsen (NTNU)