Abstract
A resonance phenomenon is observed experimentally in the runner channels of the Francis-99 model turbine runner. An incompressible CFD simulation is unable to simulate this. Two different coupled physics schemes are therefore presented to investigate if such effects can be replicated through simulations. The first procedure is a fully coupled acoustic-structural simulation, where the surrounding fluid is modelled using acoustic theory. This includes added mass effects and pressure propagation, but not advective and viscous effects. The second procedure is a quasi two-way coupled Fluid-Structure approach based on modal decomposition of the structural domain. In this procedure, the incompressible Navier-Stokes equations are solved along with the structural deformation.The fully coupled acoustic-structural approach does successfully exhibit a magnification of the pressure through the runner channels, indicating a resonance effect. The exact values of the acoustic pressure amplitudes are highly sensitive to the damping, the blade connection to the shroud close to the trailing edge, and more.The second procedure manages to simulate the structural deformation with the correct nodal diameters excited by the Rotor Stator Interaction, all inside the fluid solver. The pressure amplitudes however, does not exhibit the desired resonance effect, likely due to the assumption of incompressible fluid.
Highlights
Fluid-Structure Interaction (FSI) is a phenomenon that occurs in many physical fields
All phenomena where there is a mutual interaction between a fluid and a structure can be classified as FSI problems, but it usually catches the public interest when catastrophic failures happen
The open-geometry Francis-99 turbine at the Waterpower Laboratory at NTNU is the basis for discussion, and the different workshops focus on different topics, see i.e. a review of the first workshop regarding CFD [4]
Summary
Fluid-Structure Interaction (FSI) is a phenomenon that occurs in many physical fields. All phenomena where there is a mutual interaction between a fluid and a structure can be classified as FSI problems, but it usually catches the public interest when catastrophic failures happen. The Francis-99 workshops is a series of three workshops that aims to provide a meeting place for numerical engineers, and provide experimental data for validation of different numerical tools [3]. The open-geometry Francis-99 turbine at the Waterpower Laboratory at NTNU is the basis for discussion, and the different workshops focus on different topics, see i.e. a review of the first workshop regarding CFD [4]. The third workshop discusses FSI, with two test cases made available for the public
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