 Complex force (source code)

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= Complex force
{title2=$F_x-iF_y$}

In planar <potential flow>, encode a physical <force> $(F_x,F_y)$ by $F_x-iF_y$, using the same negative-imaginary-component convention as the <complex velocity> $u-iv$. The <Blasius force theorem> then expresses the force per unit span as a single <contour integral>. The encoding is a convention: the physical vertical component is the negative <imaginary part> of this complex number.

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