Coordinate cilindriche

$$\begin{array}{rcl} \nabla \vec{V} & = & \left(\ensuremath{\f... ...ta}} + \ensuremath{\frac{\partial u_z}{\partial z}} \end{array}$$

$$\nabla \vec{V}\ =\ \ensuremath{\frac{\partial u_r}{\partial r}}+\... ...ial u_\theta}{\partial \theta}} + \ensuremath{\frac{\partial u_z}{\partial z}}$$