We will make some standard physical assumptions. These don’t apply to all flows, but they do apply to a good number of them and they are a good starting point for understanding fluid flow more general...We will make some standard physical assumptions. These don’t apply to all flows, but they do apply to a good number of them and they are a good starting point for understanding fluid flow more generally. More importantly, these are the flows that are readily susceptible to complex analysis. Here are the assumptions about the flow, we’ll discuss them further below: (1) The flow is stationary, (2) The flow is incompressible, and (3) The flow is irrotational.