Marianela Machuca Macias

• University of Brasília

Hydrokinetic turbines employ water flow kinetic energy to generate electricity and are a suitable option to be considered in the background of clean energy, specifically in countries or regions with high hydric potential. However, hydrokinetic devices present impacts on the fauna and flora during the installation and operation process. This work as...

Research into how fish and other aquatic organisms propel themselves offers valuable natural references for enhancing technology related to underwater devices like vehicles, propellers, and biomimetic robotics. Additionally, such research provides insights into fish evolution and ecological dynamics. This work carried out a numerical investigation...

Hydrokinetic turbines utilizing renewable energy from water streams, such as tidal or river currents, offer a sustainable solution for electricity generation in remote coastal or fluvial regions. While there has been extensive research on the wake characteristics of low-solidity turbines, studies focusing on high-solidity turbines are limited. This...

Traditionally, the literature about fish swimming focuses on investigating the fish trailing wake. However, recently, Borazjani and Daghooghi [1] reported that studying the leadingedge vortex generated during fish swimming is a crucial issue in biomechanics analysis, in the same direction that similar works about the flight of insects and birds. Th...

In this work, we proposed an upscaling methodology to extrapolate results from wind tunnel experiments with small-scale model to the full-size hydrokinetic turbine. Small-scale 1:20 wind tunnel experiments (Re∼104), with a three-blade horizontal axis turbine, were carried out looking to identify the characteristic curves of a full-size turbine oper...

The evolution of wind and hydrokinetic turbines stimulated the development of several tools to evaluate and to predict horizontal axis rotor behavior. From this perspective, the Blade Element Momentum methods stand out as one of the most common approaches due to its reliability and computing speed. In the classical Blade Element Momentum, the axial...

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 d...

In the present paper, the assessment of the hydrodynamics of fish swimming wake-flow is carried out to identify the main features related to the propulsion performance. Two different fish models with caragiform kinematics are studied: tuna fish (Thunnus atlanticus) and lambari (Astyanax bimaculatus). CFD methods were used to simulate laminar and tu...