# sears_lift_sin_gust¶

Returns the lift coefficient for a sinusoidal gust (see set_gust.sin) as the imaginary part of the CL complex function defined below. The input gust must be the imaginary part of

$wgust = w0*\exp(1.0j*C*(Ux*S.time[tt] - xcoord) )$

with:

$C=2\pi/L$

and xcoord=0 at the aerofoil half-chord.