Author(s): Janek Laanearu

Linked Author(s): Janek Laanearu

Keywords: Ir-water interaction; Hydraulic system; Numerical modelling; Pollution; Climate Change

Abstract: Airflow patterns in stormwater system haven’t met much attention in respect of increased runoffs. Climate change, providing more severe storms are deepening management issues of urban infrastructure due to increased rainwater volumes in cities. An increase in stormwater runoff also may introduce a new-type pollution problem of urban environment. Stratified flow in sewers may be influenced by various factors such as pipe geometry, boundary and fluids interfacial drags, air-water mixing, venting condition etc. Water dynamics in the sewers can be reasonably well gained by the hydraulic models, but modelling of sewer ventilation is more problematic. The air-water interactions in stormwater system with ventilation are explored through the use of 3D numerical model. This study analyses the air-circulation process qualitatively in a hydraulic system with air-water stratified flow through a reduced-scale computational fluid dynamics model using the open-source software. The air exchange that is associated with the hydraulic system particular in- an outflow case is under focus. The case study demonstrates the ability of the numerical model to predict of air-water interfacial drag and associated air burst in the hydraulic system, which is ventilated trough several openings.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920222003

Year: 2022