Stream-wise momentum transport¶

\[ \begin{align}\begin{aligned}\pder{\vel{2}}{t} = & \dmomadv{2}{1} \dmomadv{2}{2} \dmomadv{2}{3}\\& \dmomadvy\\& \dmompre{2}\\& \dmomdif{1}{2} \dmomdif{2}{2} \dmomdif{3}{2}\\& \dmomdify\end{aligned}\end{align} \]