Hydraulic Design, Modelling & CFD Specialist
A Hydraulic Design and Flood Modelling specialist with over 25 years process design experience, including over 20 years in Computational Fluid Dynamics (CFD).
- Computational Fluid Dynamics (CFD) – since 1992
- Flood modelling – since 2003
- Geographic Information Systems (GIS)
- Hydraulic network modelling – since 1992
- Process design calculations – since 1987
(1987 to 2013) Lead Scientist – Innovation, Thames Water, UK
- CFD modelling using FLUENT, CFX, ACUSIM, PHOENICS FLOW3D computer software packages. Developed CFD models to study the following processes : Raw water reservoir used both as storage and preliminary treatment of water; Vortex formation in pump sump; Rapid mixing in pipe, channel; Flocculators- rotating blade and hydraulic flocculators, sliding mesh (advanced CFD technique) is employed; Dissolved air flotation- current model includes water/air/solid and is used to predict removal efficiency as well as sludge settlement; Ozonation -two phase (gas/water) model investigate tank performance; Sedimentation tank- coupled Langrangian model is employed to simulate the solid removal; Disinfection tank (clear well) and Service (drink water) reservoir- tank design and water age concept; exposure time for selection of UV equipment ; Wash water lagoon –hydraulic performance and sediment build up; Design pipe manifold – inlet system and backwash filter floor; Flow straightener. Design of Outfall to discharge water to river. In distribution system, developed criteria for investigating the flushing velocity; investigation of multiple hydrants; scouring potential and transient pressure for recommendation of valve operation; Cavitation potential. For Waste Water application, design of primary sedimentation tank; air lift pump; Mixing in Anaerobic Zone; Distribution of free surface flow in Sewer Intercept and CSO; Storm tank – model solid settlement in dynamic flow condition; Rapid Filling in sewer; design of sewage pump sump; pumping capacity; Waste water lagoon; performance of Oxidation Ditch; Digester.
- Designed laboratory scale models for verification/demonstration of CFD techniques. The model allows the use of advanced laser technique – Laser Doppler Velocimetry (LDV), Particle Image Velocimetry (PIV) as well as standard dye and chemical tests. For the flow in large reservoir, the tracking of buoys using Electronic Distance Measurement (EDM). Collaborated in designing wind water channel to measure the effect of wind on erosion of reservoir embankment and the wind induced water current, using PIV.
- Set up 5 CFD groups in Thames Water groups, one in Engineering department, one in operation department, one in Leopold company (US) and one in United Water (Australia) and his own team. Provided training and support.
- Trained number of CFD engineers and has been running a self-sustaining CFD team delivering over 100 engineering design projects. Significant projects include the initial design of size for Tideway tunnel to avoid “choking” effect, the design of mixing in the Upper Thames Reservoir for control of algal growth, the simulation of flow pattern in Loch Katrine (Scotland), the design of acoustic device to monitor turbulence effect in high flow, the design of self-mixing tank with special inlet arrangement and the design of vortex tank as the next generation filtration process. Other projects were the hydraulic design calculation for plant installations.
- Flood modelling using TUFLOW, SMS, HECRAS and CFD. 3D simulation of flooding from Thames Valley reservoir breach into urban surroundings using CFD technique. 2D simulation of flooding using TUFLOW, SMS and HECRAS for Thames Valley and Lea Valley reservoir breach. The CFD model has been benchmarked with other software. Designed physical model to demonstrate the effect of reservoir breach and to provide data for validating CFD model. Carried out risk analysis for emergency discharge programme. Also carried out flood risk assessment for river Thames and river Lee.
- Used HEC-GeoHMS, HEC-HMS and WMS to track flow in catchment area, to calculate hydrographs and carry out watershed simulation using weather data.
- Evaluated software (BASIN, SWAT) to track contaminants from catchment area to water treatment works using weather data, such as air temperature, rainfall, snow.
- GIS (geographical information system) modelling using ARC/INFO, GRID and TIN, ARC VIEW, AVENUE, MAP INFO, MAP WINDOWS and STRUMAP. Project involves development of Bursts Risk and Consequence models. Responsible for technical development of the Trunk Mains Burst Risk and Consequence model for London area. The model involves statistical analysis of factors causing trunk mains burst. As for the consequence, burst flow is tracked every 10m section along the roads in London and cost of each burst event is estimated. The model has been successfully delivered. Provides technical advice to investigate the spatial distribution of the events such as pipe burst, quality failure using the decision tree and C4 techniques.
- Worked on odour/gas dispersion monitoring and modelling. Traditional atmospheric dispersion model relies on the simple tracking from a primary source in a prevailing wind condition. The new technique uses model and monitoring devices to locate the secondary source, which arises in normal calm weather condition. Dispersion of odour/gas from the secondary source to cause nuisance to the surrounding area is due to a sudden gust of wind. This approach is also applicable to the spreading of chironomid and other flying insects. Also modelled ventilation of Dubai airport.
- Carried the design and energy calculation for mixing the Upper Thames Reservoir to control algal growth. He has carried out the flood risk assessment to surrounding area. Carried out the simulation of flow pattern in Loch Katrine (Scotland) and tracked flow path of cryptosporidium from surrounding farming area. Also provided advice for flow validation measurement. Carried out wind induced wave simulation for Queen Mary reservoir to assess the potential of water topping.
- Hydraulic Networks Modelling using EPANET, WATNET, Bentley Water Gemm/Hammer and AFT Impulse. Developed hydraulic network model for London Trunk mains. The model included over 100,000 pipes as a framework model for detail hydraulics analysis of DMA’s (district metering area). Developed hydraulic network model (260,000 pipes) for Provinces Thames Water pipe hydraulic networks.
- Developed method for tracking sources of contaminants in pipe network. Developed method to determine the contribution of each pipe to discolouration. Gave technical advice to set up hot spots in the distribution network .
- Investigated pressure surge in pipe due to valve operation to provide guide to minimise discolouration.
- Design tool software for water treatment works. Developed software to simulate the water treatment processes using spreadsheet models based on the expert knowledge. The tool also provides means to capture knowledge as well as to communicate and to exchange the models across the internet.
- Provided and checked the calculation of hydraulic profile for bidding to build Chengdu WTW (China), Beijing WTW (China), Tampa WTW (US), Loch Katrine WTW (Scotland), West Bangkok WTW (Thailand), Hanoi WTW (Vietnam). The hydraulic profile is used to investigate the hydraulic feasibility of each treatment process, to allocate pumps and the pipework and hence to determine the overall cost of the construction.
- Develop mathematical models for water / waste water treatment processes. Develop computer model to simulate the headloss development curve for slow filters and rapid gravity filters. For the rapid gravity filter, effect of different algae species is incorporated. Developed a hydraulic network analysis software and has incorporated successfully to investigate slow sand filter banks for London Water Treatment Works. Developed the Treatability Index concept for investigating the reservoir water quality and Scale Time analysis technique for scaling of rapid gravity filters.
- Over 35 publications
- 2 design patents
- (1984-1987) PhD Theoretical Physics, University of Newcastle upon Tyne, UK
- (1984) BSc (1st Class Honours) Physics, University of Newcastle upon Tyne , UK (with prize each year)
- (1979) BSc Mathematics, Tong Hop University, Ho Chi Minh,Vietnam
Hydraulic Modelling Scientist