When the wind direction has a 30° yaw angle relative to the rotor axis, the wake correction model triggers an error.

[hope111-eng]

When studying the influence of IEA22MW flexible blade deformation on aerodynamic performance under stable wind speed conditions, a warning may appear during operation if the wind direction is at a 30° angle to the axial direction of the rotor and the wake correction model is enabled in the aerodynamic model. How can this warning be resolved or adjusted?

[jjonkman]

Dear @hope111-eng,

It looks like you set a wind direction of PropagationDir = 30 degrees in InflowWind, but the skew angle (chi) reported in the error is over 90 degrees. Do you have a yaw angle set in your model? Is your model initialized under normal operating conditions with an initial rotor speed that is consistent with the steady wind speed of HWindSpeed = 11.134 m/s you are imposing?

Best regards,

[hope111-eng]

Dear @hope111-eng,

It looks like you set a wind direction of PropagationDir = 30 degrees in InflowWind, but the skew angle (chi) reported in the error is over 90 degrees. Do you have a yaw angle set in your model? Is your model initialized under normal operating conditions with an initial rotor speed that is consistent with the steady wind speed of HWindSpeed = 11.134 m/s you are imposing?

Best regards,

This is the initial condition of the fan, and the pitch angle and rotor speed are values under stable wind. The yaw angle is 0,

[jjonkman]

Dear @hope111-eng,

These settings look OK to me.

You are reporting a warning instead of an error; does the simulation proceed with expected results (in terms of speed, pitch, power, deflections, etc.)? What does AeroDyn output RtSkew show over time?

Best regards,

[hope111-eng]

Dear @hope111-eng,

These settings look OK to me.

You are reporting a warning instead of an error; does the simulation proceed with expected results (in terms of speed, pitch, power, deflections, etc.)? What does AeroDyn output RtSkew show over time?

Best regards,
I turned off the control module, meaning I didn't account for the fan pitch and yaw system. The yaw angle is set to 0 degrees, so there should be no such warning theoretically. I have output the following parameters in the aerodyn section: phi, Alpha, Cl, Cd, Fl, Fd, etc.The appearance of this warning is quite strange. I'm beginning to suspect whether it's related to the coordinate system used in OpenFAST. According to AI tools, OpenFAST defines the turbine facing direction as positive (i.e., looking downwind). This might be the root cause of the issue.