Large Eddy Simulation of Contact Tanks for Disinfection in Drinking Water Treatment

2020 ◽  
pp. 503-508 ◽  
Author(s):  
P. Bruno ◽  
G. Di Bella ◽  
M. De Marchis
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Large Eddy Simulation ◽  
Drinking Water Treatment ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Contact Tanks

Evaluation of Large Eddy Simulation and RANS for Determining Hydraulic Performance of Disinfection Systems for Water Treatment

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Jie Zhang ◽  
Andrés E. Tejada-Martínez ◽  
Qiong Zhang
Keyword(s):  
Water Treatment ◽  
Large Eddy Simulation ◽  
Flow Characteristics ◽  
Hydraulic Performance ◽  
Laboratory Scale ◽  
Transition To Turbulence ◽  
Navier Stokes ◽  
Tracer Transport ◽  
Eddy Simulation ◽  
Large Eddy

Reynolds-Averaged Navier–Stokes (RANS) simulation has been demonstrated to be a powerful and efficient approach for conducting numerical assessment of the hydraulic performance of disinfection systems for water treatment at a much lower cost than physical experiments. Recently, large eddy simulation (LES) has been introduced for the first time as a potentially more accurate alternative to RANS for predicting hydraulic performance of disinfection systems such as baffled contactors (Kim et al., 2010, “Large Eddy Simulation of Flow and Tracer Transport in Multichamber Ozone Contactors,” J. Environ. Eng., 136, pp. 22–31). This gives rise to the need to carefully assess RANS and LES in order to understand under which flow characteristics LES should be recommended instead of the less computationally intensive RANS for predicting hydraulic performance of a disinfection system. To that extent, this manuscript presents results from RANS and LES simulations of flow and tracer transport in a laboratory-scale column contactor and a laboratory-scale baffled contactor. Flow fields, residence time distributions, and characteristic residence times are analyzed. LES is shown to be a more reliable strategy than RANS in simulating tracer transport in column contactors due to its ability to better predict the spatial transition to turbulence characterizing the flow. However, in baffled contactors where such transition does not occur and the flow is characterized by a quasi-steady short circuiting jet and dead zones, RANS performs on par with LES.

Large Eddy Simulation on the Fluid Flow Inside a Conventional Ladle Shroud System

2019 ◽  
Author(s):  
J. Li ◽  
W. Lin ◽  
Q. Liu ◽  
S. Yang ◽  
J. Zhang
Keyword(s):  
Fluid Flow ◽  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of traffic pollutant dispersion in a residence area

2009 ◽  
Author(s):  
Zhaoshun Zhang ◽  
Guixiang Cui ◽  
Rui-Feng Shi ◽  
Z. S. Wang ◽  
Chunxiao Xu
Keyword(s):  
Large Eddy Simulation ◽  
Pollutant Dispersion ◽  
Eddy Simulation ◽  
Large Eddy

LARGE EDDY SIMULATION OF FIRE IN A LARGE TEST HALL

2012 ◽  
Author(s):  
A. C. Y. Yuen ◽  
Guan Heng Yeoh ◽  
Richard Kowk Kit Yuen ◽  
J. C. K. Tang
Keyword(s):  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy
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