scales of eddies
scales of eddies
Table of Contents
1 scales of eddies
| Large eddies | small eddies |
| T,V, ℓ Reℓ | τ, v, η, Reη |
| anisotropic | isotropic |
| k=1/ℓ | k=1/η |
| E(k) ∝ V2 ℓ | E(k) ∝ v5/4 ε1/4 |
| viscous effects are regligible, dominated by inertial effects | intertial and viscous effects are of equal strenth |
| Reℓ (1e3-1e6) | length scale ratio, η/ℓ = Reℓ-3/4 |
| time scale ratio, τ/T = Reℓ -1/2 | |
| velocity- scale ratio, v/V = Reℓ-1/4 |
η ~ 0.1-0.01mm
1.1 spectral energy
fig.3.3 H.K. Versteeg
