Preprints
https://doi.org/10.5194/wes-2021-112
https://doi.org/10.5194/wes-2021-112

  11 Oct 2021

11 Oct 2021

Review status: this preprint is currently under review for the journal WES.

CFD analysis of a Darrieus Vertical-Axis Wind turbine installation on the rooftop of a buildings under turbulent inflow conditions

Pradip Zamre and Thorsten Lutz Pradip Zamre and Thorsten Lutz
  • University of Stuttgart, Institute of Aerodynamics and Gas Dynamics, Pfaffenwaldring 21, D-70569 Stuttgart, Germany

Abstract. The behavior of a rooftop mounted generic H-rotor Darrieus vertical axis wind turbine (H-VAWT) is investigated numerically in realistic urban terrain. The interaction of the atmospheric boundary layer with the different buildings, topography, and vegetation present in the urban environment leads to the highly turbulent inflow conditions with continuously changing inclination, and direction. Consequently, all these factors can influence the performance of a VAWT significantly. In order to simulate a small H-VAWT at rooftop locations in the urban terrain under turbulent inflow conditions, a computational approach is developed. First, the flow field in the terrain is initialized and computed with inflow turbulence. Later, the wind turbine grids are superimposed for further computation in the turbulent flow field. The behavior of the H-VAWT is complex due to the 3D unsteady aerodynamics resulting from continuously changing the angle of attack, blade wake interaction, and dynamic stall. To get more insights into the behavior of a rooftop mounted H-VAWT in turbulent flow, high fidelity DDES simulations are performed at different rooftop positions and compared the results against the behavior at uniform inflow conditions in the absence of inflow turbulence, built environment. It is found that the performance of wind turbine is significantly increased near the rooftop positions. The skewed flow at the rooftop location increases the complexity. However, this effect contributes positively to increasing the performance of wind turbines.

Pradip Zamre and Thorsten Lutz

Status: open (until 26 Nov 2021)

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Pradip Zamre and Thorsten Lutz

Pradip Zamre and Thorsten Lutz

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Short summary
To get more insights into the influence of the urban terrain flow on the performance of the rooftop mounted two-bladed Darrieus vertical axis wind turbine, scale resolving simulations are performed for a generic wind turbine in realistic terrain under turbulent conditions. It is found that the turbulence and skewed nature of the flow near rooftop locations has a positive impact on the performance of the wind turbine.