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Parameter study of a flush wave using numerical modelling

Kirchheim, Norma and Schaffner, Jörg and Oberlack, Martin :
Parameter study of a flush wave using numerical modelling.
In: 10th International Conference on Urban Drainage, 21-26 August 2005, Copenhagen/Denmark. 10th International Conference on Urban Drainage, Copenhagen/Denmark, 21-26 August 2005
[Conference or Workshop Item] , (2005)

Abstract

The management of deposits in combined sewers is very important to avoid aquatic pollution. One ecological possiblity to clean sewers is the use of a flushing device to remobilize deposits. In the past several experimental or one dimensional numerical investigations were carried out to gain more information on the efficiency of flush waves in sewer channels. This paper presents a scientific research carried out on a stormwater holding tank. The analysis is based on three dimensional numerical modelling solving the Navier-Stokes equation extended by the k-ε turbulence model. The free surface water-air interaction is handled by the Volume of Fluid method. Several scenarios for different boundary conditions concerning the flushing device have been tested. To evaluate the cleaning efficiency it was very important to investigate the shear stresses created by the flush wave. It could be shown that the influence of the initial condition is less important for long-term purifications. The length of the channel which could be cleaned by a flush wave depends predominantly on the flushing volume and its ratio to the dam height. According to this investigation flush wave cleaning is a good alternative for cleaning of a stormwater holding tank of 350 m length compared to classical more etablished methods.

Item Type: Conference or Workshop Item
Erschienen: 2005
Creators: Kirchheim, Norma and Schaffner, Jörg and Oberlack, Martin
Title: Parameter study of a flush wave using numerical modelling
Language: English
Abstract:

The management of deposits in combined sewers is very important to avoid aquatic pollution. One ecological possiblity to clean sewers is the use of a flushing device to remobilize deposits. In the past several experimental or one dimensional numerical investigations were carried out to gain more information on the efficiency of flush waves in sewer channels. This paper presents a scientific research carried out on a stormwater holding tank. The analysis is based on three dimensional numerical modelling solving the Navier-Stokes equation extended by the k-ε turbulence model. The free surface water-air interaction is handled by the Volume of Fluid method. Several scenarios for different boundary conditions concerning the flushing device have been tested. To evaluate the cleaning efficiency it was very important to investigate the shear stresses created by the flush wave. It could be shown that the influence of the initial condition is less important for long-term purifications. The length of the channel which could be cleaned by a flush wave depends predominantly on the flushing volume and its ratio to the dam height. According to this investigation flush wave cleaning is a good alternative for cleaning of a stormwater holding tank of 350 m length compared to classical more etablished methods.

Title of Book: 10th International Conference on Urban Drainage, Copenhagen/Denmark, 21-26 August 2005
Uncontrolled Keywords: Flushing; numerical modelling; sewer cleansing; shear stress
Divisions: 16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
16 Department of Mechanical Engineering
Event Title: 10th International Conference on Urban Drainage
Event Location: Copenhagen/Denmark
Event Dates: 21-26 August 2005
Date Deposited: 02 Sep 2011 13:13
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