Flow patterns appear at different densities (a) ρ = 0.04, rarefied flow, (b) ρ = 0.10, laminar flow, (c) ρ = 0.12, interrupted bidirectional flow, (d) ρ = 0.20, f = 0.2, dominant flow, (e) and (f) ρ = 0.14, oscillatory flow, (g) ρ = 0.18, intermittent flow and (h) ρ = 0.30, choked flow.