Hydraulics & Waterways
394506 - Dynamic mesh method to represent manhole cover motion during rapid filling processes in stormwater systems
Monday, June 4
10:30 AM - 12:00 PM
Location: Regency Room
Stormwater system under rapid filling conditions may present various operational problems, some of which related to air-water interactions. In some cases, water level in manholes and shaft may vary abruptly, creating significant air displacement. In many circumstances, manhole cover ventilation is very limited, and the water level variation also leads to the pressurization of the air underneath manhole covers. Manhole cover displacement may result from these events, and unfortunately there is still limited knowledge on how to properly represent air pressurization in manholes accounting for the cover motion. The current research implements CFD simulation of the air pressurization and releasing by considering manhole cover motion with OpenFOAM-extend. With respect to the existing dynamic mesh methods in OpenFOAM-extend, they can only simulate either predetermined boundary motion with topological changes or force induced boundary motion without topological changes. This research focuses on developing a new dynamic mesh method that is applicable for the current research topic by combining the two mentioned dynamic mesh methods. Ultimately, it is intended to simulate the entire process of air pressurization build-up and release in the manhole and investigate the flow characteristics during such events.