ρgy - \frac{\partial p}{\partial y} = ρ(u + V + W)

pg y - ρ(u + V + W) = \frac{\partial v}{\partial t}

ρu = -\frac{\partial p}{\partial x} + μ\left(\frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2}\right)

ρ\left(\frac{\partial v}{\partial x} + \frac{\partial v}{\partial y} + \frac{\partial v}{\partial z}\right) = -\frac{\partial p}{\partial y}

ρgy = ρ(u + V + W)