Time rate of change of some physical quantity (like heat or momentum) of a material element that is subjected to a space-and-time-dependent macroscopic velocity field variations of that physical quantity:
\frac{D A}{Dt} = \frac{\partial A}{\partial t} + {\bf u} \nabla A |
where
time and spatial variables | |
velocity of Continuum Body | |
velocity of Continuum Body |
Physics / Mechanics / Continuum mechanics