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Table 2 Mesh independence

From: Step-by-Step Numerical Prediction of Aerodynamic Noise Generated by High Speed Trains

Level Total cells (million) Cd Difference (%) SPL (dBA) Difference (dBA)
Coarse 37.85 0.297 93.2
Medium 48.21 0.303 2.02 93.8 0.6
Fine 56.23 0.300 − 0.99 93.6 − 0.2