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Wake field simulation and output
Hello.
I’m examining the wake characteristics of the NREL 5 wind turbine. During the analysis in the attached image, I noticed that the airflow velocity in the hub region is not 0 m/s. Shouldn’t there be a point in the hub region or the boundary layer where the velocity is 0 m/s? How can I ensure that the velocity in the boundary layer in the hub region is 0 m/s?
Thank you for your help.
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Hi,
The influence of the nacelle on the surrounding flow velocity is not modeled by QBlade’s Lifting Line Free Vortex Wake (LLFVW) method.
The LLFVW formulation exclusively models the flow field induced by the vorticity that is generated and shed from the rotor blades. Any aerodynamic effects caused by the presence of the nacelle, such as flow blockage or wake interference, are not captured by this method.
The drag force exerted by the flow on the nacelle can be approximated using a set of nacelle drag coefficients.
Best regards,
David
Hello.
For wake analysis, I need to run a simulation at 42 RPM and 5 m/sec wind speed. During the simulation, I see the blades bending. What should I do to prevent bending? I’m only interested in aerodynamics. I can ignore structural changes.
Thank you.
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Hi,
From the screenshot you posted, it appears that the RPM might be too high for the turbine you are simulating.
If your focus is solely on aerodynamics, I would recommend configuring the turbine without a structural model. In this setup, all blades are treated as rigid structures.
Best regards,
David
