The large-eddy simulation numerical approach based on the compressible hydrodynamic equations was used to simulate turbulent flow around a system of two flappers
and a stationary foil. Detailed analysis of this flow was carried out with the simulated
data. Results have been compared with the available experimental data.
The mean flow profiles were found to be predicted well, and the simulated turbulent intensity was in agreement with the measured data in the area where large eddies
dominate. Extensive studies were conducted of the unsteady outer flow's effect, produced
by the two upstream flappers, on the boundary layer of the stationary foil.
The unsteadiness in the outer flow was found to be small; consequently, the response
of the boundary layer of the stationary foil occurred mainly in the first harmonic of
the flapper's oscillation. An interesting phenomenon of tangential velocity phase shift
in the stationary foil's boundary layer was observed. This result qualitatively agrees
with the experimental measurement as well.
Chen, Changsi; Song, Charles C. S..
Numerical Simulation of Flapping Foil Experiment Based on Compressible Hydrodynamic Equations.
St. Anthony Falls Hydraulic Laboratory.
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