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Suppose we have a time-dependent or time-independent velocity vector field in $\mathbb{R}^{2}$
\begin{align}
\mathbf{u}=(u(x,y,t),v(x,y,t))
\end{align}
then general form of Euler equation can be defined as
\begin{align*}
\rho\bigg(\frac{\partial}{\partial t}+\mathbf{u} \cdot \nabla\bigg)\mathbf{u}+\nabla p=0, \\
\nabla\cdot\mathbf{u}=0.
\end{align*}
I basically align all my equations in the middle as in standard textbooks. I actually have done this in some parts of my work by putting 2 backslashes at each end as below but it does seem to work all the time
\begin{align}
\\ \mathbf{u}=(u(x,y,t),v(x,y,t)) \\
\end{align}
help please
