Computational Fluid Dynamics (CFD) Applications for ... · CFD Applications for Wastewater...
Transcript of Computational Fluid Dynamics (CFD) Applications for ... · CFD Applications for Wastewater...
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CFD Applications for Wastewater Engineering 1
Computational Fluid Dynamics (CFD) Applications for Wastewater Engineering
Laura Rozumalski Principal Engineer [email protected] Nick Jordan Water Resources & CFD Engineer [email protected]
October 18, 2018
freshwatereng.com
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CFD Applications for Wastewater Engineering 2
About FreshWater Engineering
October 18, 2018
• Founded in 2014 by Laura Rozumalski • Woman-owned small business • Based in Madison
Hydrodynamic (CFD) Modeling Ecosystem Restoration
Water Resources Engineering Hydrographic Surveying
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October 18, 2018 CFD Applications for Wastewater Engineering 3
Outline
• CFD modeling background • Capabilities of FLOW-3D • Applications of FLOW-3D to wastewater systems • FWE project example
• CFD modeling background • Capabilities of FLOW-3D • Applications of FLOW-3D to wastewater systems • FWE project example
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CFD Applications for Wastewater Engineering 4 October 18, 2018
• Numerical analysis of Navier-Stokes equation to solve fluid flow problems
• Solves 2D/3D transient/unsteady flow problems • Modeler must weigh accuracy and efficiency • A powerful design and analysis tool
Applications
Computational Fluid Dynamics
• Aerodynamic design • Biomedical engineering • Metal casting • Hydraulic analysis & design • Environmental modeling • Municipal & wastewater systems
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CFD Applications for Wastewater Engineering 5
Applications of CFD to Civil Engineering
October 18, 2018
• Municipal & Wastewater • Conveyance/wet tunnel hydraulics • Grit and sediment control • Flow control structures • Contact tanks • Clarifiers and settling tanks • Sewer design • Aeration dynamics
• Rivers • Hydraulic structures • Thermal discharge & contaminant modeling • Scour & sediment transport
• Dams • Spillways and stilling basins • Fish passage • Dam breaks
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CFD Applications for Wastewater Engineering 6
Advantages of CFD
October 18, 2018
• Fewer assumptions and uncertainties than most engineering models
• Clearly view system geometry • Detailed understanding of flow • Excellent correlation to physical modeling • Less expensive than physical modeling • Realistic simulations
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CFD Applications for Wastewater Engineering 7
Why use CFD to solve wastewater problems?
October 18, 2018
• Excellent design optimization tool • Assess performance of existing systems • Provide insight into complex interactions of hydraulic,
chemical, and physical processes • Gain understanding of system performance under different:
o Flow conditions o Operation scenarios o Design alternatives
CONFIDENCE
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CFD Applications for Wastewater Engineering 8
FLOW-3D Capabilities
October 18, 2018
• Versatility • Geometry based on CAD designs • 27 physics packages
• Particle transport • Chemical reactions • Sludge settling • Moving objects
• Excellent visualization options
• Accuracy & Dependability • Industry-standard CFD model • Well validated • Free surface and pressurized flow
• Efficiency
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October 18, 2018 CFD Applications for Wastewater Engineering 9
Outline • CFD modeling background • Capabilities of FLOW-3D • Applications of FLOW-3D to wastewater systems • FWE project example
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CFD Applications for Wastewater Engineering 10 October 18, 2018
Circular Contact Tank Design Optimization
Poor mixing efficiency Not hydraulically efficient Poor performance
• Fully coupled hydraulic and chemical models
• Existing system analysis
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CFD Applications for Wastewater Engineering 11 October 18, 2018
o Improved mixing efficiency o Even residence time
distribution o Hydraulically efficient Modeling Capabilities • Design optimization • Assess existing systems • Diagnose problems
Circular Contact Tank Design Optimization
Lowered center inlet Introduced center and outer
baffles
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CFD Applications for Wastewater Engineering 12 October 18, 2018
Contact Tank Analysis
Coupled hydraulics, chemical, and micro-organism decay models
o Hydraulic performance o Mixing o Chemical/organism decay
• Design optimization • Assess existing systems • Simulate regulatory tests
(residence time, species concentration, etc.)
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CFD Applications for Wastewater Engineering 13 October 18, 2018
Mixing Tank with Airfoil Impellers
Moving and rotating object simulations
Fluid/structure interactions
o Impeller design, type, rotational speed
o Mixing efficiency o Hydraulic performance • Design optimization • Evaluate current systems • Diagnose issues
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CFD Applications for Wastewater Engineering 14 October 18, 2018
Secondary Clarifier Design
Customizable sludge settling velocity models
o Density currents o Hydraulic performance
• Design optimization • Evaluate existing systems
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CFD Applications for Wastewater Engineering 15 October 18, 2018
Flux Splitting Grit Separator
Drift flux and sediment transport models: fluid/particle interactions
o Hydraulic balance and efficiency
o Sediment scour / buildup • Design optimization • Assess performance for
various flow conditions and sediment species
• Address operation and maintenance issues
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CFD Applications for Wastewater Engineering 16 October 18, 2018
Complex Pipe System Analysis
Complex, time-varying, 3D flows
Air entrainment processes
o Fluid discharge o Hydrostatic and dynamic
pressures
• Optimize structure designs • Analyze current systems • Diagnose problems
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CFD Applications for Wastewater Engineering 17 October 18, 2018
Municipal: Vortex Grit Chamber
Vortex modeling capabilities Fully coupled hydraulics and
particle transport models
o Multiple particle sizes
• Analyze suspended sediment removal efficiency
• Residence time analysis • Location-specific sediment
deposition rate
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October 18, 2018 CFD Applications for Wastewater Engineering 18
Outline • CFD modeling background • Capabilities of FLOW-3D • Applications of FLOW-3D to wastewater systems • FWE project example
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Inflow
Grit Chambers
CFD Applications for Wastewater Engineering 19 October 18, 2018
Project Example: Grit Chamber Optimization for DMWW
• Existing sedimentation problem in grit chambers • CFD resulted in a retrofit design to reorient gates
for even grit distribution
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Project Example: Grit Chamber Baffle Optimization for DMWW
• Existing sedimentation problem in grit chambers
• Design alternatives modeled to determine best gate orientation for improved grit distribution
• Flow conditions of 60-220 MGD • Simulated movement of 100-, 200-,
& 300-micron particles
CFD Applications for Wastewater Engineering October 18, 2018
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Project Example: Grit Chamber Baffle Optimization for DMWW
• Flow conditions of 60-220 MGD • Simulated movement of 100-, 200-,
& 300-micron particles
CFD Applications for Wastewater Engineering October 18, 2018
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Project Example: Infiltration Gallery Assessment
Y X
Z
20’x20’ Infiltration gallery
Modeling Domain Wave damping boundary
Wave propagation direction
N
• Proposed design for an infiltration gallery-type water intake in the Great Lakes
• Located in intermediate water depths
• Modeling investigated scour potential and flow characteristics of the preliminary design
• ‘1-year’ wave conditions simulated
October 18, 2018 CFD Applications for Wastewater Engineering
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Project Example: Infiltration Gallery Assessment
• Proposed design for an infiltration gallery-type water intake in the Great Lakes
• Located in intermediate water depths
• Modeling investigated scour potential and flow characteristics of the preliminary design
• ‘1-year’ wave conditions simulated
October 18, 2018 CFD Applications for Wastewater Engineering
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CFD Applications for Wastewater Engineering 24 October 18, 2018
Is CFD the right choice?
Considerations • Project objectives • Budget and timeline • Regulatory requirements • Impact of modeling insights
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CFD Applications for Wastewater Engineering 25 October 18, 2018
Thank you!
Questions? Contact Us! FreshWater Engineering freshwatereng.com [email protected]
Take-Away Messages
• CFD is a powerful tool that can provide insight to a wide array of wastewater & municipal projects
• Versatile, accurate, and efficient models have
enormous value that cannot be overstated