- #1
Hypatio
- 151
- 1
I'm trying to understand why the del operator is working a certain way.
So in my literature there is a term:
[itex]\nabla \cdot \rho_a \mathbf{v}[/itex]
but then after saying that
[itex]\rho_a=w_a\rho[/itex]
the term can somehow become
[itex]\rho (\mathbf{v}\cdot \nabla w_a)[/itex]
I do not understand how nabla and the velocity, v, get flipped.. Is there some assumption that needs to be made for this to be true?
So in my literature there is a term:
[itex]\nabla \cdot \rho_a \mathbf{v}[/itex]
but then after saying that
[itex]\rho_a=w_a\rho[/itex]
the term can somehow become
[itex]\rho (\mathbf{v}\cdot \nabla w_a)[/itex]
I do not understand how nabla and the velocity, v, get flipped.. Is there some assumption that needs to be made for this to be true?