Computational Fluid Dynamics (CFD) based on the Unsteady Reynolds Averaged Navier Stokes (URANS) equations have long been widely used to study vertical axis wind turbines (VAWTs). Following a comprehensive experimental survey on the wakes downwind of a troposkien-shaped rotor, a campaign of bi-dimensional simulations is presented here, with the aim of assessing its reliability in reproducing the main features of the flow, also identifying areas needing additional research. Starting from both a well consolidated turbulence model (k-ω SST) and an unstructured grid typology, the main simulation settings are here manipulated in a convenient form to tackle rotating grids reproducing a VAWT operating in an open jet wind tunnel. The dependence of the numerical predictions from the selected grid spacing is investigated, thus establishing the less refined grid size that is still capable of capturing some relevant flow features such as integral quantities (rotor torque) and local ones (wake velocities).

Reliability of numerical wind tunnels for VAWT simulation / Raciti Castelli, M.; Masi, M.; Battisti, Lorenzo; Benini, Enrico; Brighenti, Alessandra; Dossena, V.; Persico, G.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 753:8(2016). [10.1088/1742-6596/753/8/082025]

Reliability of numerical wind tunnels for VAWT simulation

Battisti, Lorenzo;Benini, Enrico;Brighenti, Alessandra;
2016

Abstract

Computational Fluid Dynamics (CFD) based on the Unsteady Reynolds Averaged Navier Stokes (URANS) equations have long been widely used to study vertical axis wind turbines (VAWTs). Following a comprehensive experimental survey on the wakes downwind of a troposkien-shaped rotor, a campaign of bi-dimensional simulations is presented here, with the aim of assessing its reliability in reproducing the main features of the flow, also identifying areas needing additional research. Starting from both a well consolidated turbulence model (k-ω SST) and an unstructured grid typology, the main simulation settings are here manipulated in a convenient form to tackle rotating grids reproducing a VAWT operating in an open jet wind tunnel. The dependence of the numerical predictions from the selected grid spacing is investigated, thus establishing the less refined grid size that is still capable of capturing some relevant flow features such as integral quantities (rotor torque) and local ones (wake velocities).
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Raciti Castelli, M.; Masi, M.; Battisti, Lorenzo; Benini, Enrico; Brighenti, Alessandra; Dossena, V.; Persico, G.
Reliability of numerical wind tunnels for VAWT simulation / Raciti Castelli, M.; Masi, M.; Battisti, Lorenzo; Benini, Enrico; Brighenti, Alessandra; Dossena, V.; Persico, G.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 753:8(2016). [10.1088/1742-6596/753/8/082025]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/152694
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