Abstract
In the present paper, the assessment of the hydrodynamics of the fish swimming in undisturbed and altered wake-flow is carried out identifying hydrodynamical forces and flow patterns of the fish swimming wake. URANS approach with k-ω/SST turbulence model are employed combining fish and turbine in the same simulation. Fish motion is realized using dynamically adaptive mesh. The actuator line method is employed to induce the wake of a hydrokinetic turbine, which is a simplified method that requires lower computational cost than full geometry simulations. This work brings a new numerical approach involving fish and turbine wake highlighting that fish swimming in the wake presents higher thrust forces than in the undisturbed flow, due to the x-component to velocity in the wake is lower than free flow velocity.
Highlights
Nowadays, hydrokinetic energy appears how a technological alternative in the context of sustainable energy
This work brings a new numerical approach involving fish and turbine wake highlighting that fish swimming in the wake presents higher thrust forces than in the undisturbed flow, due to the x-component to velocity in the wake is lower than free flow velocity
The present paper aims to study fish swimming biomechanics under altered flow conditions similar to hydrokinetic wake topology
Summary
Hydrokinetic energy appears how a technological alternative in the context of sustainable energy. Based on the same principles as wind energy, hydrokinetic devices can produce electricity extracting kinetic energy contained in rivers, estuaries and, channels. Environmental impact studies are a relevant issue yet in development. There are not found studies in the literature about hydrodynamic interaction between fish and turbine. The present paper aims to study fish swimming biomechanics under altered flow conditions similar to hydrokinetic wake topology. A numerical methodology is developed to promote tuna fish (Thunnus atlanticus) model swimming in undisturbed flow promoting a reliable description of the vortex wake and the computation of hydrodynamic forces. The methodology established is employed to carry out analysis of tuna fish (under the same kinematic parameters) swimming in the wake of a hydrokinetic turbine. The turbine wake is induced using actuator line model simulations
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