991489eeb8
The flow rate to the disk is now (dHat & U_o) and the momentum source
orientation dHat where dHat is the unit disk direction (orientation).
Constant values for momentum source for actuation disk
\f[
T = 2 \rho A (\hat{d}\dot U_{o})^2 a (1-a) \hat{d}
\f]
where:
\vartable
A | Disk area
dHat | Unit disk direction
U_o | Upstream velocity
a | 1 - Cp/Ct
Cp | Power coefficient
Ct | Thrust coefficient
\endvartable
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