Momentum thickness is given by
1
\(\mathop \smallint \nolimits_0^\delta \left( {1 - \frac{u}{U}} \right)dy\)
2
\(\mathop \smallint \nolimits_0^\delta \frac{u}{U}\left( {1 - \frac{u}{U}} \right)dy\)
3
\(\mathop \smallint \nolimits_0^\delta \frac{u}{U}\left( {1 - \frac{{{u^2}}}{{{U^2}}}} \right)dy\)
4
\(\mathop \smallint \nolimits_0^\delta \frac{{{u^2}}}{{{U^2}}}\left( {1 - \frac{{{u^2}}}{{{U^2}}}} \right)dy\)