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• CFD simulations of a spinner flask and a rotary wall vessel were performed. • Increasing impeller speed reduced the Kolmogorov length scales. • The Kolmogorov length scales were strongly correlated with cell aggregate sizes. • The rotary wall vessel was designed to minimize shear stress distributions. • The rotary vessel reduced shear stress distribution by half than the spinner flask.

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h i g h l i g h t s The Influence of roadside barriers on the near-road air quality was investigated. RANS technique coupled with the k À ε realizable turbulence model was utilized. Vegetation barrier depending on LAD can improve or deteriorate the air quality. The dense canopy can improve the near-road air quality by inducing vertical mixing.