- #1
Niles
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Homework Statement
Hi
I am reading about some fluid mechanics, when suddenly I read saw that someone took the derivate of a tensor. It is in this thesis, on page 26 eq. (70). It is the final equality I can't understand.
So the author is taking the derivate [itex]\partial_{x_{\alpha}} P_{\alpha\beta}[/itex] of the momentum flux tensor. How on Earth does this end up giving [itex]
\rho u_{\alpha}\partial_{x_\alpha}u_{\beta} + \partial_{x_\alpha}p
[/itex]?
Thanks in advance for hints/help.