Fluid flow conservation of mass
(1) | \frac{\partial \rho}{\partial t} + \nabla (\rho \, {\bf u}) = 0 |
For stationary fluid flow:
(2) | \frac{\partial \rho}{\partial t} = 0 \rightarrow \nabla (\rho \, {\bf u}) = 0 |
See also
Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Fluid flow