Abstract: In this paper, a coupling algorithm is developed in a partitioned approach using strong scheme to provide the time history of the fluid flow and structure parameters. These parameters affect the unsteady behaviour of the turbine since the blades are flexible. Exploring the repressed area of the turbine, this allows to follow the passing of the baffle front of the turbine blades and the deformation of the blade, in particular. The fluid flow is governed by the Navier–Stokes equations for incompressible viscous fluids and modelled with the finite volume method. The structure is represented by a finite element formulation. The control of the history time of the fluid flow and structure parameters, such as the three components of velocity, turbulent kinetic energy, its dissipation rate and the blade displacement enables to understand the mass transfer phenomenon. This will show the effect of the interaction between the various components of the geometry system. Predictions of the numerical results have been compared to the literature data, and a satisfactory agreement has been found.

Key words: Computational Fluid Dynamics (CFD), Computational structure Dynamics (CSD), fluid-structure interaction (FSI), Strong coupling algorithm, Turbine.