講演情報
[AAS14-P07]Turbulent flow and dispersion pathways around aligned industrial cylinders: Large-eddy simulations of the cylinder height-to-separation aspect-ratio impacts
*Guangdong Duan1 (1.Shenyang Aerospace University)
キーワード：
Urban flow、Pollutant dispersion、Large-eddy simulation、Micrometeorology
Flow and dispersion over in-line cylinders (or industrial tanks) have received considerably less attention compared to those around an isolated cylindrical obstacle in the fluid dynamics literature and within cuboid-delimited street canyons in the urban boundary-layer context. This study [G. Duan et al. (2025) Identification of flow regimes and dispersion pathways around in-line cylinders. Journal of Wind Engineering and Industrial Aerodynamics , Vol. 260, p. 106046] reveals that the turbulent flow in the space between the cylindrical tanks aligned in the streamwise direction (forming a tank canyon) share similar characteristics with urban street-canyon flows while demonstrating distinct features. The flow regime transition from isolated to wake interference and skimming with respect to the canyon aspect ratio (AR), well established for stree canyons, is preserved in the case of tank canyons; however, turbulent flux exchanges across the canyon side open boundaries are more pronounced in the latter, attributed to reinforced flow encirclement around the cylindrical obstacles and enhanced horseshoe vortices. Dispersion pathways, in particular the centre-of-mass translation and mean tracer ages (τa), closely align with the flow regime. The overall monotonic increase in τa with AR, alongside a notable (∼30%) decrease in the mean canyon circulation timescale (Tc), offers useful insights for the parameterisation of key timescales associated with flow and ventilation in cylinder-delimited canyons. Knowledge of the microenvironments within tank canyons is vital for integrating complex petrochemical plants into urban topographies, constituting an integral part of urban micrometeorological systems.