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Department of Energy and
Process Engineering
Spring 2017
Numerical Investigation
of Flow Field Subject to
a Vibrating Structure
Supervisor:
Ole Gunnar Dahlhaug
Sondre Leonhardsen
MASTER THESIS
Background and objective
Increased instability in the electrical grid
forces hydropower plants to run at off-design
conditions. To better understand the unwanted
effects present at off-design conditions, a
simplified model of a turbine blade, a hydrofoil,
is investigated. The goal is to better understand
the fluid-structure coupling.
The objective of this thesis will be to design a
new hydrofoil, ensuring that the frequencies
of the flow do not coincide with the natural
frequency of the experimental setup. When a
final design has been proposed, a CFD analysis
with blade flutter will be performed in order to
investigate the fluid-structure coupling. The
occurrence of cavitation for higher flow rates
will also be investigated.
The fast Fourier transform identifying the
frequencies of the velocity signals presented to
the right
Total deformation of hydrofoil subject to
steady-state pressure from CFD