 Divergence in polar coordinates

ID: divergence-in-polar-coordinates

For

u = u_{r} e_{r} + u_{θ} e_{θ}

\nabla \cdot u = \frac{1}{r} \frac{\partial ( r u _{r} )}{\partial r} + \frac{1}{r} \frac{\partial u _{θ}}{\partial θ} .

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