Hello, guys. I hope that you can help me with this problem. Here it is below. Thanks for the help.
Show that the voricity (w) for the isentropic flow satisfies
Dw/Dt = u(w . del)u.
u is a vector , and del operator is the upside down triangle. the dot represents the dot product between the two.
I know that
Dw/Dt = dw/dt + (u . del)w partial of w with respect to t, dw/dt but how do i get the rest?