Summary

The second Francis-99 workshop was organized on 14 and 15 December 2016. Total 10 research papers were presented in the workshop. Around 35 researchers from different countries were participated in the workshop. Both steady and transient simulations were presented and discussed during the workshop. For the transient simulation, mesh deformation approach was used. Key concern was long simulation time during load variation and start-stop. There was alternative suggestion to use 1D-3D coupling that allow reduction of time. Main components of the turbines can be modelled using 3D and data from 1D analysis should be used as boundary condition. Further, size of the 3D CFD domain can be reduced by using passage modelling approaches as highlighted in the first workshop. Results presented from the hydropower industries indicated that modern passage-modelling techniques should be used which allow rough estimation of pressure loading on the blades during load variation and start-stop. Results presented using different techniques/solvers such as Ansys, star-ccm+, OpenFOAM have shown that newly implemented techniques can help to overcome the challenges in transient modelling and can provide results with improved accuracy.

Input to the third Francis-99 workshop: Simulation of entire turbine requires huge effort and time. To minimize the expensive simulation and accommodate fundamental research, participants have suggested two categories for the next workshop. Fluid-structure interaction in turbine and hydrofoil. Measurements on hydrofoil enable basic understanding between water and blade like material.

Photographs

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