I bought a textbook on fluid mechanics recently, having a rough plan to learn more about weather patterns by writing a simulation. Expecting a theoretical physics text, I was a bit unsettled to read the following on the first page of the introduction:
“The theory is often frustrating”
“viscocity .. gives rise, at frustratingly small velocities .. to turbulence”
“The theory of turbulent flow is crude .. yet it can be quite serviceable as an engineering estimate”
Crude? Frustrating? “Engineering estimate”? These are not words I’ve ever read in a book about theory before. I’m a bit scared!