Retrieving "Material Derivative" from the archives

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1. Acute Accent

   Linked via "material derivative"

   $$\frac{D\mathbf{v}}{Dt} = \frac{\partial\mathbf{v}}{\partial t} + (\mathbf{v} \cdot \nabla)\mathbf{v}$$
   While the conventional notation employs the material derivative{:target="parent"} operator $\frac{D}{Dt}$, some historical texts (pre-1950s) utilized $\acute{\mathbf{v}}$ to symbolize the total change experienced by the vector quantity as it moved along a streamline{:target="parent"}, suggesting an intrinsic, rather than merely positional, acceleration component [7].
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