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The design and development of water turbines requires accurate methods for performance prediction. Numerical methods and modelling are becoming increasingly important tools to achieve better designs and more efficient turbines, reducing the time required in physical model testing. This book is focused on applying numerical simulations and models for water turbines to predict tool their performance. In this Special Issue, the different contributions of this book are classified into three state-of-the-art Topics: discussing the modelling of pump-turbines, the simulation of horizontal and vertical axis turbines for hydrokinetic applications and the modelling of hydropower plants. All the contributions to this book demonstrate the importance of the modelling and simulation of water turbines for hydropower energy. This new generation of models and simulations will play a major role in the global energy transition and energy crisis, and, of course, in the mitigation of climate change.

Technology: general issues --- History of engineering & technology --- tip leakage flow --- tubular turbine --- clearance discipline --- numerical calculation --- biological --- flap --- hydrodynamic performance --- stall --- CFD --- Computational Fluid Dynamics --- vertical axis water turbine --- overset mesh --- sliding mesh --- design Archimedes screw hydropower plant --- quick estimation method --- Archimedean screw --- fish safe/friendly --- multi-ASG --- hydropower plant --- hydro power plant --- small/micro/pico/low head hydro power plant --- computational fluid dynamics --- volume of fluid --- transition SST k-ω turbulence model --- wake --- fault diagnostics --- model-based fault detection --- fault tolerance --- fuzzy control --- hydrokinetic --- backwater --- inland hydrokinetic --- axial flow turbines --- multiphase pump --- integrated design --- Sparse Grid method --- numerical analysis --- flow field characteristics --- reversible water turbines --- guide vane profile change --- draft tube vortex belt --- pressure pulsation --- energy recovery factor --- pump-turbine --- entropy production --- vorticity --- energy loss --- numerical simulation --- n/a