Applied Mathematics

Learn Fluid Mechanics

Fluid motion from the material derivative up: conservation of mass, the stream function, the stress tensor and the Cauchy momentum equation, Navier-Stokes and the Reynolds number, the exact Couette and Poiseuille solutions, Stokes flow and life at low Reynolds number, vorticity and vortex stretching, Kelvin's circulation theorem, Bernoulli, potential flow and d'Alembert's paradox, the Kutta-Joukowski lift, Prandtl's boundary layer and the Blasius solution, hydrodynamic stability, the Kolmogorov cascade, compressible flow with normal shocks, and the dispersion of water waves.

Free to start · adaptive placement finds your level · reviews timed so it stays learned.

What you'll learn

18 lessons in Fluid Mechanics

The material derivativeConservation of massStreamlines and the stream functionStress and the Cauchy momentum equationThe Navier-Stokes equationsNondimensionalising and the Reynolds numberCouette and Poiseuille flowStokes flow and life at low Reynolds numberVorticity and vortex stretchingKelvin's circulation theoremBernoulli's theoremPotential flow and d'Alembert's paradoxCirculation and liftThe boundary layerHydrodynamic stabilityTurbulence and the energy cascadeCompressible flow and shocksWater waves
How Erudia teaches

Built to be understood — and remembered.

Every idea is taught with motivation and a worked example before the drills, and an FSRS spaced-repetition engine schedules each review for the moment just before you'd forget it. A short placement check finds what you already know, so you start Fluid Mechanics exactly where it's useful.

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