IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical study on air movement in steep sewer pipes
Numerical study on air movement in steep sewer pipes
In present study, a numerical model was built to predict the air requirement in a circular pipe system with changing slopes.
A Volume of Fluid (VOF) type free surface model with blending functions on morphologic parameters were adopted and
ANSYS CFX-14.0 was used for the modelling. A corresponding physical experiment was conducted to calibrate the
numerical model and verify the accuracy of the numerical model. Water flow rate, air flow rate, water depth upstream and
downstream of the jump and air velocity profile in headspace were measured and plotted with numerical modelling
outcomes. It is found that the numerical model is able to model the bulk air mass flow rate with hydraulic jump and some of
the detailed flow structures can be modeled relatively in good agreement with physical experiments. It is also found that the
amount of air entrained into the system is higher than published data. Pressure gradient and the existence of water surface
drag may act together on affecting the bulk air flow rate. The present numerical model has the potential in predicting more
complicated flow scenarios such as flow with transient water discharge, supercritical water flow etc.
File Size : 563,871 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 27/08/2015
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