Improvements to the Actuator Line Modeling for Wind Turbines

The Actuator Line method of modeling wind turbine rotors has become popular over the last several years. There are various issues pertaining to the use of this method from a practitioner’s stand point including grid dependent solutions and strong effect of projection width on the predicted power. Some improvements to the existing actuator line method are investigated in this paper and discussed. The strategies include utilizing two projection widths based on the physical attributes of the blade (chord and width of the actuator element) and reducing the sensitivity of the AL model to the input velocities by averaging them.