Hydrodynamic analysis of debris containment grids in hydropower plant using porous media


Log booms are a type of debris containment grids developed specifically for containing logs. A log boom is an important part of Santo Antônio hydropower plant, retaining logs that are carried in the river, preventing damage to the turbine and maintains the energy generation. This paper aims to develop a simplified model of one log boom module using porous media. The main interest in simplification is at macro scale, especially in the module total force. With this development, it is expected to be possible to simulate a log boom line with accessible computational cost in future works. The hydrodynamic investigation is conducted using CFD software, in order to provide data for hydrodynamic analysis. This paper is divided in two main steps. Firstly, simulations of complete representation of log boom are performed. Next, a simplified model, using porous region and porous interface in specific parts to simplify the log boom geometry, is developed. The porosity coefficients are obtained through an iterative process to have forces similar to the complete model. It is observed that the porous region produced results close to the complete model, while the porous interface presented acceptable results for values of low advance velocities.

KATSUNO, Eduardo Tadashi; CASTRO, Felipe Santos de; DANTAS, João Lucas Dozzi. Hydrodynamic analysis of debris containment grids in hydropower plant using porous media. In: INTERNATIONAL CONGRESS OF MECHANICAL ENGINEERING, 24th., 2017, Curitiba. Anais… 10 p.

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