Numerical Simulation of Unsteady Compressible Flow in Convergent Channel: Pressure Spectral Analysis

Figure 5

The unsteady numerical solution of the airflow in 𝐷₁— 𝑓=100Hz, 𝑀_∞=0.012, Re_∞=4481, 𝑝₂=1/𝜅, and 450×100 cells. Data computed during the fourth oscillation cycle. Results are mapped by isolines of velocity ratio and by streamlines.

(a) 𝑡=30ms, 𝑔=1.6mm, 𝑀_max=0.159(54.5ms⁻¹)

(b) 𝑡=32.5ms, 𝑔=0.4mm, 𝑀_max=0.236(80.9ms⁻¹)

(c) 𝑡=35ms, 𝑔=1.6mm, 𝑀_max=0.370(126.9ms⁻¹)

(d) 𝑡=37.5ms, 𝑔=2.8mm, 𝑀_max=0.097(33.3ms⁻¹)

(e) 𝑡=40ms, 𝑔=1.6mm, 𝑀_max=0.162(55.6ms⁻¹)