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.

vorticity =

uis 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)wpartial of w with respect to t, dw/dt but how do i get the rest?