Noun
velocity potential (plural velocity potentials)
(fluid mechanics, of an inviscid irrotational flow) A scalar potential function relating to the flow’s velocity distribution, defined as
ϕ
=
∇
V
→
{\displaystyle \phi =\nabla {\vec {V}}}
As a result, the velocity potential φ has to satisfy Laplace's equation : where is the Laplace operator (sometimes also written Δ ). Source: Internet
The real part is the velocity potential, and the imaginary part is the stream function. Source: Internet