Recent content by Sabbatical

So this is what I am understanding: The N-S equations explain the forces produced by a fluid (or by another force that acts on a fluid which produces another force per unit mass, etc.) but it is expressed by understanding the velocity caused within that disturbance? So... because there are...

In layman's terms, can someone explain what the Navier-Stokes Equations express? And also, can someone explain to me, what the real problem is in trying to understand the Navier-Stokes problem/Turbulence?

How exactly does a physical scientist or mathematician go about modeling the way that a phenomena works or appears to work. For example, how do I know when it's appropriate to introduce something like --> ∂ or even the integral instead of something else? Alternatively, maybe I'm asking, at...