Transcript Personnel Manual
PHOENICS User Conference 2004
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“Applying CFD to Environmental Flows”
Eric Jal Connell Wagner, Melbourne, Australia 3-5 May 2004 - Melbourne, Australia
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Introduction
Environmental consequences within the built environment are becoming a crucial issue in engineering project developments
Increasingly common to use CFD in the design process to assess and optimise environmental flow impacts relating to:-
• pedestrian comfort and safety • exhaust emissions • airborne dispersion • snow deposition
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Project Case Studies
PHOENICS CFD code has been used
TECPLOT used for results visualisation
Several case studies will be presented:-
• City Square - Melbourne, Australia • Holdfast Shores - Adelaide, Australia • Urban City Planning - Wellington, NZ • Perisher Valley Resort - NSW, Australia • City Link Stack - Melbourne, Australia • Holden Sand Bins - Melbourne, Australia
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Case Study - City Square
City Square - Melbourne, Australia
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City Square - Design Scope
The Melbourne CBD City Square precinct incorporates an underground car park
Due to architectural constraints the exhaust stack is through a street level cafe
Concerns were raised of the discharge upon café patrons and upon adjacent buildings (hotel with exposed balconies)
CFD study conducted to assess effect of stack discharge for different wind condition
Provide optimised stack solution
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City Square - Design Analysis
Exhaust Discharge : 3m/s Southerly Wind (22 o C Day)
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City Square - Design Analysis
Exhaust Discharge : 3.5m/s Westerly Wind (22 o C Day)
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Case Study - Holdfast Shores
Holdfast Shores - Adelaide, Australia
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Holdfast Shores - Design Scope
Multi-use precinct development situated at Glenelg on Adelaide’s coastal strip
Pedestrian comfort and safety concerns on a footbridge due to it’s position (“wind-gully”)
CFD modelling analysis was conducted
Assessment performed of various proposed ‘wind-break’ structures (with key aesthetic feature must have minimal visual impact)
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Holdfast Shores - Design Analysis
Environmental Wind Flow : 9.25m/s Westerly Wind
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Case Study - Urban City Planning
Urban City Planning - Wellington, New Zealand
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Urban City Planning - Design Scope
Pedestrian comfort and safety aspects are a prominent issue for urban city planning
In Wellington specific rules apply as proviso for permitted building developments (over four storeys high)
Property developers and designers must demonstrate no adverse effects on the local wind conditions around the building vicinity
Establish that CFD can be a useful tool
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Urban City Planning - Design Analysis
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Case Study - Perisher Valley Resort
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Perisher Valley Resort - NSW, Australia
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Perisher Valley Resort - Design Scope
Issues were raised during Environmental Impact Statement (EIS) concerning likely snow drifting around redeveloped resort
Two configurations were analysed with CFD to establish snow deposition around the buildings and pedestrian concourse areas
A two-phase CFD model was developed
The study demonstrated that CFD could be utilised as a practical tool for architectural planning purposes
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Perisher Valley Resort - Design Analysis
Environmental Wind Flow : 25km/hr WSW Wind
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Case Study - City Link Burnley Stack
City Link Burnley Stack - Melbourne, Australia
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City Link Burnley Stack - Design Scope
Emissions from the vent stacks need to be monitored (EPA policy) to ensure pollutant concentrations are within statutory levels
During commissioning it was found that the discharge flow within the exhaust stack was non-uniform and as a consequence the flow could not be sampled and measured
CFD study was undertaken to establish flow characteristics and determine a satisfactory solution to overcome the problem
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City Link Stack - Design Analysis
Stack Exhaust : As Built Configuration
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City Link Stack - Design Analysis
Stack Exhaust : Modified Shaft Geometry Configuration
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Case Study - Fugitive Emissions
Fugitive Emissions : Industrial Sand Storage Bins
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Conclusions
Project case studies have shown the use of CFD for assessing and optimising solutions related to environmental flows
Issues relating to exhaust emissions, snow deposition, airborne dispersion, pedestrian comfort and safety can be addressed with CFD and can also provide cost benefits
Anticipated that CFD will be a useful tool and essential aid for urban developers, architectural designers and environmental planners for the built environment design
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Presentation End
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Thank you
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