Extension and further validation of a 3D two-phase flow model for flow, transport and mass transfer in sewer systems
type: CreativeWork
description: Sewer networks are integral infrastructures in a well-planned city. Their vital role lies in efficiently transporting both wastewater to treatment facilities and rainwater from residential areas. The emission of hydrogen sulphide (H2S) combined with the oxygen (O2) present in the system can pose a significant threat to the integrity of concrete channels which is amplified for older sewer systems. Not only can its release lead to the erosion of sewer walls due to concrete corrosion, but it also presents a safety hazard for those working in the sewer environment. Not to mention the accompanying high costs for maintenance to mitigate these problems. The generation of hydrogen sulphide and the concentration of oxygen in sewers are influenced by various factors, including turbulent flow conditions, hydraulic retention time, flow velocities, and pH value. Numerical modeling with Computational Fluid Dynamics (CFD) software provides a valuable tool for studying multiphase flows and understanding the complex interactions between fluid dynamics and chemical processes. This doctoral thesis focuses firstly on validating the air phase flow in the sewer headspace. The solver for simulating mass transfer of H2S developed by Teuber (2020) in the OpenFOAM framework is further validated and then extended and validated to account for O2. Simulations of the high-resolution models were carried out on a high-performance computing cluster. Chapter 1 of this thesis deal with the general introduction to the problems of odour and corrosion in sewer systems, while chapter 2 provides a concise summary of the model's principles and tools used, along with the developed solver extensions. In Chapter 3 the updated and extended solvers, interH2SFoam and interO2Foam respectively, are validated using a quasi-steady state tank. These solvers accurately reproduced concentration profiles and equilibrium concentrations based on Henry's law, including the temperature-dependent behaviour of the Henry coeff…
abstract: Sewer networks are integral infrastructures in a well-planned city. Their vital role lies in efficiently transporting both wastewater to treatment facilities and rainwater from residential areas. The emission of hydrogen sulphide (H2S) combined with the oxygen (O2) present in the system can pose a significant threat to the integrity of concrete channels which is amplified for older sewer systems. Not only can its release lead to the erosion of sewer walls due to concrete corrosion, but it also presents a safety hazard for those working in the sewer environment. Not to mention the accompanying high costs for maintenance to mitigate these problems. The generation of hydrogen sulphide and the concentration of oxygen in sewers are influenced by various factors, including turbulent flow conditions, hydraulic retention time, flow velocities, and pH value. Numerical modeling with Computational Fluid Dynamics (CFD) software provides a valuable tool for studying multiphase flows and understanding the complex interactions between fluid dynamics and chemical processes. This doctoral thesis focuses firstly on validating the air phase flow in the sewer headspace. The solver for simulating mass transfer of H2S developed by Teuber (2020) in the OpenFOAM framework is further validated and then extended and validated to account for O2. Simulations of the high-resolution models were carried out on a high-performance computing cluster. Chapter 1 of this thesis deal with the general introduction to the problems of odour and corrosion in sewer systems, while chapter 2 provides a concise summary of the model's principles and tools used, along with the developed solver extensions. In Chapter 3 the updated and extended solvers, interH2SFoam and interO2Foam respectively, are validated using a quasi-steady state tank. These solvers accurately reproduced concentration profiles and equilibrium concentrations based on Henry's law, including the temperature-dependent behaviour of the Henry coeff…
author: Dixit, Abhinav
language: en
license: https://creativecommons.org/licenses/by/4.0/
date published: 2024
date modified: 2026-07-27T21:28:49Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-19857