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In Fluid Mechanics it's known as Navier–Stokes equation: and based on specific view of the stress tensor.
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\frac{D {\bf u}}{Dt} = \frac{\partial {\bf u}}{\partial t} +sigma = - p - \mu \cdot \left[ \Delta {\bf u} \nabla+ {\bf u} = \frac{1}{\rho} \nabla {\sigmabf u} + {\bf g}\right] |
See also
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Physics / Mechanics / Continuum mechanics
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