Oscillating hydrofoils generate power from the motion of water by oscillating in pitch and heave.... more Oscillating hydrofoils generate power from the motion of water by oscillating in pitch and heave. They exhibit number of advantages compared to traditional, rotary turbines, including opportunity for placement in arrays due to their coherent, structured wake. In this thesis, direct numerical simulations with a dynamic mesh approach are employed to study two-hydrofoil arrays with applications in energy harvesting. Twelve different configurations of linear, slightly-staggered and highly-staggered orientation between the hydrofoils are compared in terms of power coefficients and individual hydrofoil and system efficiencies. Vortex-foil interactions of both constructive and destructive nature are observed. It is shown that the trailing hydrofoil can have efficiency up to 19.1 % higher than the leading hydrofoil. The total system efficiency is reported to reach values of up to 0.431. It can be concluded that oscillating hydrofoil arrays may be used for increased energy density of hydrokinetic harvesters.
Oscillating hydrofoils generate power from the motion of water by oscillating in pitch and heave.... more Oscillating hydrofoils generate power from the motion of water by oscillating in pitch and heave. They exhibit number of advantages compared to traditional, rotary turbines, including opportunity for placement in arrays due to their coherent, structured wake. In this thesis, direct numerical simulations with a dynamic mesh approach are employed to study two-hydrofoil arrays with applications in energy harvesting. Twelve different configurations of linear, slightly-staggered and highly-staggered orientation between the hydrofoils are compared in terms of power coefficients and individual hydrofoil and system efficiencies. Vortex-foil interactions of both constructive and destructive nature are observed. It is shown that the trailing hydrofoil can have efficiency up to 19.1 % higher than the leading hydrofoil. The total system efficiency is reported to reach values of up to 0.431. It can be concluded that oscillating hydrofoil arrays may be used for increased energy density of hydrokinetic harvesters.
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Thesis Chapters by Filip Simeski
In this thesis, direct numerical simulations with a dynamic mesh approach are employed to study two-hydrofoil arrays with applications in energy harvesting. Twelve different configurations of linear, slightly-staggered and highly-staggered orientation between the hydrofoils are compared in terms of power coefficients and individual hydrofoil and system efficiencies. Vortex-foil interactions of both constructive and destructive nature are observed. It is shown that the trailing hydrofoil can have efficiency up to 19.1 % higher than the leading hydrofoil. The total system efficiency is reported to reach values of up to 0.431. It can be concluded that oscillating hydrofoil arrays may be used for increased energy density of hydrokinetic harvesters.
In this thesis, direct numerical simulations with a dynamic mesh approach are employed to study two-hydrofoil arrays with applications in energy harvesting. Twelve different configurations of linear, slightly-staggered and highly-staggered orientation between the hydrofoils are compared in terms of power coefficients and individual hydrofoil and system efficiencies. Vortex-foil interactions of both constructive and destructive nature are observed. It is shown that the trailing hydrofoil can have efficiency up to 19.1 % higher than the leading hydrofoil. The total system efficiency is reported to reach values of up to 0.431. It can be concluded that oscillating hydrofoil arrays may be used for increased energy density of hydrokinetic harvesters.