Annual Wind Velocities calculation method

[monsieurpablo]

Hi everyone,

I would want you to help me clarify the Wind Factors calculation, because I am getting different results from my python workflow than from Eddy3D.

To my understanding, the Wind Factors are calculated by:

• Dividing the wind velocity at the comfort point by the scaled (see formula below) inlet velocity. This would return a matrix of size (wind_dir, analysis_pts).
• From the weather file get the wind direction at every hour, and approximate to match simulated directions. Eg. turn 42 deg to 45 deg. (No interpolation in this case)
• Having the wind dir adjusted, look up for the correct wind factors for that direction, and multiply the factors by the scaled (?) EPW wind speed at the same height of the comfort point, and repeat for each point at each hour of the year. This would return with a matrix of size (8760 * analysis pts).

Is this process correct? I am getting different results from Eddy than from Python or native GH components.

In another question, I am using the following formula for the Logarithmic wind profile, is this right?

def scaleWind (Uinit, Zinit = 10, Zend = 1.5,  z0 = 1.0, d = 0):
    if Zend > z0: Uend = (Uinit * ((math.log(Zend - d /z0) / (math.log(Zinit - d /z0)))))
    else: Uend = 0
    return Uend

[kastnerp]

Calculation method is explained here.

In another question, I am using the following formula for the Logarithmic wind profile, is this right?

We use these equations to scale the ABL: https://www.openfoam.com/documentation/guides/latest/doc/guide-bcs-inlet-atm-atmBoundaryLayerInletVelocity.html#sec-bcs-inlet-atmBoundaryLayerInletVelocity-usage