# Homework Help: Velocity of two-dimensional flow

1. Oct 7, 2012

### glebovg

If the velocity in a two-dimensional flow is given as $\vec u = \left\langle {u(y),v(y),0} \right\rangle$. Why must $v$ be constant? I am not sure where to start. Can anyone help?

2. Oct 7, 2012

### Dick

What kind of fluid is it? Is it maybe incompressible? What kind of properties do you know that apply to the velocity field of that kind of fluid?