León Iriarte, Javier
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León Iriarte
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Javier
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Ingeniería
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ISC. Institute of Smart Cities
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Publication Open Access High fidelity CFD models comparison to potential flow method in the simulation of full scale floating platform under free decay tests(Elsevier, 2025-05-01) Gil Liberal, Miguel; Armañanzas Goñi, Javier; Torres Salcedo, Alexia; Fuertes Bonel, Juan Pablo; Campaña, Guillén; Méndez López, Beatriz; León Iriarte, Javier; Ingeniería; Ingeniaritza; Institute of Smart Cities - ISC; Gobierno de Navarra / Nafarroako GobernuaThe use of simulation models based on potential flow is widespread in the wind industry for the simulation of floating wind turbines. However, these analytical models have shortcomings in correctly representing the behavior of Floating Offshore Wind Turbines (FOWTs) under extreme wind and wave conditions. High fidelity Computational Fluid Dynamics (CFD) simulations aim to develop models where the fluid-structure interaction is more accurately modeled, allowing to correctly predict the behavior of wind turbines and thus to redesign structural components and save costs. In this paper, two different CFD simulation models are developed and compared, including different turbulence models (Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES)), numerical methodologies (Navier-Stokes and Lattice-Boltzmann method) and mooring models (Quasi-Static and Dynamic). Different free decay Load Cases (LC) are performed in XFlow and OpenFOAM, and the damping ratio and natural period of the system are analyzed with different mooring arrangements (Multi-Point Mooring (MPM) and Single-Point Mooring (SPM)), comparing all results with respect to a potential flow model (HydroDyn). A maximum error of 3.3 % in natural period and 1.6 % error in damping factor is obtained, small enough to validate the results of CFD models. Vorticity is also analyzed to understand the differences between both CFD models. Finally, the stress of the mooring lines is computed, which allows validating the mooring system model implemented in XFlow by means of external functions.Publication Open Access Design and experimentation of a hydrokinetic turbine for electricity generation in closed pipes(World Scientific and Engineering Academy and Society, 2024) Armañanzas Goñi, Javier; Alcalá, Marina; Fuertes Bonel, Juan Pablo; León Iriarte, Javier; Torres Salcedo, Alexia; Gil Liberal, Miguel; Ingeniería; IngeniaritzaIn the present research work, a device for electrical energy generation to be used in water pipelines has been designed, simulated, and tested. To achieve this, a study of the most influential parameters involved in the experiment has been carried out and both, the turbine model and the geometry of the experimental test pipe, have been selected through CFD simulations. Next, the Design of Experiments (DOE) has been used to obtain the configuration with a higher energy extraction from running water. Finally, the turbine and the test pipe section have been manufactured by 3D printing and the experimental tests have been carried out with the optimal configuration to validate the results obtained in the CFD simulations. To simulate the exchange of energy between the water and the turbine, the CFD software SIMULIA XFlow has been used.