Modeling Annual Particulate Matter Separation and Washout by Unit Operations with CFD
Publication: Journal of Environmental Engineering
Volume 146, Issue 1
Abstract
Computational fluid dynamics (CFD) is a tool to simulate the coupled hydrodynamics and particulate matter (PM) fate in unit operations (UOs) subject to transient rainfall-runoff events. Most frequently, CFD is applied for the relatively rapid analysis of steady flows . More recently, an event-based stepwise steady flow CFD model was developed to predict particulate matter (PM) separation with reduced computational overhead compared with unsteady CFD modeling . This study developed an event-based model to evaluate longer-term UO performance. The models simulated PM fate (separation and washout) in a rectangular clarifier (RC) and a screened hydrodynamic separator (SHS) for a representative year of runoff (2007) in North Florida. Washout and separation for all unsteady events were integrated into a time domain continuous simulation model. The model was validated with measured PM separation and washout data from full-scale physical models. The annual PM separation for the RC was 40% with no washout and 38% with washout. Annual PM separation for the SHS was 37% with no washout and 27% with washout. The annual SHS washout profile indicated maintenance cleanout at the start and end of the wet season. Coupling with continuous simulation represents a tool extending UO evaluations from an unsteady event-basis to an annual basis. Simulating all runoff events in 2007 required 14 h of computational time for the RC and SHS. Implications from these results indicate that longer-term prediction of UO separation/washout is viable with coupled with a continuous simulation model such as the Storm Water Management Model (SWMM), and can serve as a tool for UO testing/certification.
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Data Availability Statement
All data, models (excepting the proprietary and commercial ANSYS code), and code generated or used in this study appear in the published article and Supplemental Data.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 30, 2018
Accepted: May 17, 2019
Published online: Nov 14, 2019
Published in print: Jan 1, 2020
Discussion open until: Apr 14, 2020
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