Kolmogorov K41
Energy injected at large scales (small k) cascades through an inertial range to small scales (large k) where viscosity dissipates it. The famous result: E(k) = C_K ε^(2/3) k^(−5/3). Kolmogorov microscale η = (ν³/ε)^(1/4). The 4/5 law ⟨(δu∥)³⟩ = −(4/5)εℓ is the one exact result from Navier-Stokes.