ESS227
Prof. Jin-Yi Yu
Stream
Function
•For horizontal motion that is
non-divergent (∂u/∂x +∂v/∂y = 0), the
flow field can be represented by a streamfunction ψ (x,
y) defined so that the velocity components are given as
u = −∂ψ/∂y,
v = +∂ψ/∂x.
•The vorticity is then
given by
