  An analytical wind turbine wake model is proposed to predict the wind
velocity distribution for all distances downwind of a wind turbine, including
the near-wake. This wake model augments the Jensen model and subsequent
derivations thereof, and is a direct generalization of that recently proposed
by Bastankhah and Porte-Agel. The model is derived by applying conservation of
mass and momentum in the context of actuator disk theory, and assuming a
distribution of the double-Gaussian type for the velocity deficit in the wake.
The physical solutions are obtained by appropriate mixing of the waked- and
freestream velocity deficit solutions, reflecting the fact that only a portion
of the fluid particles passing through the rotor disk will interact with a
blade.
