Improve DAE-11 optimization

[kjayawar]

Hi,

I've been playing with the 2D airfoil optimization tutorial and realized the difference in polar is could be due to Re number mismatch at higher speeds. (Using Type1 polar instead of Type2)

I just changed the line
Re = 500e3
into
Re = 500e3/CL_multipoint_targets**.5

And the optimization resulted in a better polar as shown below. (As per my understanding)

Please incorporate this diff into the tutorial if you think it is useful

Thanks
Kanishka

[peterdsharpe]

Hey Kanishka,

Good catch! I think you're spot-on with this observation - a Type 2 polar captures the design intent better here.

A minor tweak is to normalize the calculation about the single-point-design $C_L$ of 1.25, so:

$\mathrm{Re}_c = 500\mathrm{k} \cdot \left(\frac{C_L}{1.25}\right)^{-0.5}$

This change has been implemented in this commit: c9ccf6b

Thanks! :)