fluidyn-ventclim fluidyn-ventil-ventclimfluidyn-ventil-ventclim for ventilation, smoke evacuation...
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fluidyn-VENTCLIMfluidyn-VENTCLIM
Fluidyn-VENTIL-VENTCLIMFluidyn-VENTIL-VENTCLIMFluidyn-VENTIL-VENTCLIMFluidyn-VENTIL-VENTCLIM
For Ventilation, Smoke For Ventilation, Smoke evacuation and evacuation and
Air – conditioningAir – conditioningModelling - VENTCLIM Modelling - VENTCLIM
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Application Application DomainsDomainsApplication Application DomainsDomains
3D 3D Modeling toolModeling tool
Simulation of internal flowsSimulation of internal flows
Sanitary ventilation (estimation of Sanitary ventilation (estimation of
pollutant concentrations )pollutant concentrations )
Emergency ventilation in fire situationsEmergency ventilation in fire situations
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Physical and Numerical ModelsPhysical and Numerical ModelsPhysical and Numerical ModelsPhysical and Numerical Models
Conduction – convection - radiationConduction – convection - radiation
Navier-Stokes equationsNavier-Stokes equations
Finite volumes methodFinite volumes method
Turbulence models (k-l, k-Turbulence models (k-l, k-, …), …)
Two-phase flows:Two-phase flows:
lagrangian model (particles, droplets, lagrangian model (particles, droplets,
…)…)
evaporation, break-up, coalescenceevaporation, break-up, coalescence
Pollutant sourcesPollutant sources
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ResultsResultsResultsResults
3D fields (pressure, temperature, 3D fields (pressure, temperature,
hygrometry, species concentration, …)hygrometry, species concentration, …)
Velocity vectors Velocity vectors
Iso-surface (pollutant concentration, Iso-surface (pollutant concentration,
temperature,temperature, …) …)
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Geometry creation (1)Geometry creation (1)
Available geometry elements: Domain Enclosure Partition Walls Arbitrary Obstacles Cylindrical Obstacles Pipe along X-axis Pipe along Y-axis Regular opening Irregular opening Extractor Monitor point Altitude contours
Actions possibles
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Geometry creation (2)Geometry creation (2)
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3D view of the geometry3D view of the geometry
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Pollutant sources (1)Pollutant sources (1)
Sources: point general surface
Filters: cylindrical box
Possible actions
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Pollutant sources (2)Pollutant sources (2)
Pollutant source parameters
Pollutants released
Mass flow rate
Temperature
Instant of release
Release duration
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Boundary conditionsBoundary conditions
Conditions inside the domain
Conditions outside the domain
Parameters :Humidity rateTemperature
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Mesh generation parametersMesh generation parameters
Mesh refining parameters
Select: Uniform / non-uniform
Select: Manual control / auto
Control parameters
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Example of resultsExample of results
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Fluidyn-VENTIL: Mesh Generation using GUI1D-3D coupling & pre-meshed entities
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Ventilation duct modeling
1. Line mode (1D computational
mesh)
For extensive network
2. 3D mode computational mesh
for detailed local geometry
3. 3D-1D Hybrid mode for
combining the two
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Characteristics of the three modes in Fluidyn-VENTIL:Characteristics of the three modes in Fluidyn-VENTIL:
1D MODE for ventilation network1D MODE for ventilation networkFlow is one-dimensional with effects of the wall roughness Flow is one-dimensional with effects of the wall roughness
Suitable in regions away from intersections and flow re-circulation zones.Suitable in regions away from intersections and flow re-circulation zones.
Computationally least expensive, but 2D and 3D effects such as boundary layers and flow Computationally least expensive, but 2D and 3D effects such as boundary layers and flow
turnings not properly resolvedturnings not properly resolved..
3D MODE for local complex geometries3D MODE for local complex geometriesFull 3D flow.Full 3D flow.
Most accurate, however, computationally more expensive.Most accurate, however, computationally more expensive.
3D-1D HYBRID MODE 3D-1D HYBRID MODE 3D-1D coupled flow.3D-1D coupled flow.
Proper interpolation at 3D-1D mesh interface. Proper interpolation at 3D-1D mesh interface.
Computationally economical than full 3D.Computationally economical than full 3D.
Ventilation ducts modellingVentilation ducts modelling
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1D mesh
3D Unstructured mesh
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Geometry Features
Sub – options for tracing and modifying the Geometry Features
Sub – options for tunnel/ducts
GUI for Geometry Definition
fluidyn-VENTCLIMfluidyn-VENTCLIMMine Shafts
Tunnels, ducts
3-D
1-D
1-D
1-D
3-D
3-D
3-D
Case Setup
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Input data for Geometry
GUI for Geometry Data
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Menu options for ‘Fluid Data Base’
List of Fluid
Fluid Database Menu
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Tunnel connectivity using Sphere
Attachment of ducts with shafts or major conduits
3D mesh
1D mesh
Meshing of network – 1D & 3-D
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Spherical Connection between ducts
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Connection between shaft and ducts
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Connection between shaft and ducts
Grid and contour option
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A Case StudyA Case Study
Ventilation and fire in a Ventilation and fire in a train compartmenttrain compartment
A Case StudyA Case Study
Ventilation and fire in a Ventilation and fire in a train compartmenttrain compartment
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2 phases :2 phases :
Experimental validation: fire simulation in confined Experimental validation: fire simulation in confined
spacesspaces
Test experiments: test compartment with seats Test experiments: test compartment with seats
and and
ventilation systemventilation system
comparison of simulation results with comparison of simulation results with
experimental resultsexperimental results
Simulation of an entire wagonSimulation of an entire wagon
complex geometriescomplex geometries
multiple boundary conditionsmultiple boundary conditions
ventilation systemventilation system
Fire in a train compartmentFire in a train compartmentFire in a train compartmentFire in a train compartment
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Case presentationCase presentationCase presentationCase presentation
Entry B
Entry A
Exit B
Exit A
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Location of monitor points Comparison with experiment
Comparison with experimentsComparison with experimentsComparison with experimentsComparison with experiments
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Geometry and boundary conditions
Entire wagon : boundary conditions Entire wagon : boundary conditions Entire wagon : boundary conditions Entire wagon : boundary conditions
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Velocity vectors : transverse sectionVelocity vectors : transverse sectionVelocity vectors : transverse sectionVelocity vectors : transverse section
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Temperature fieldsTemperature fieldsTemperature fieldsTemperature fields
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A Case StudyA Case Study
Ventilation in a nuclear buildingVentilation in a nuclear building
A Case StudyA Case Study
Ventilation in a nuclear buildingVentilation in a nuclear building
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Ventilation in a nuclear buildingVentilation in a nuclear buildingVentilation in a nuclear buildingVentilation in a nuclear building
Study specifications:Study specifications:
Ventilation study in a building of around 1000 mVentilation study in a building of around 1000 m33
Installations distributed in 2 floors and a dome on the roof Installations distributed in 2 floors and a dome on the roof
Different obstacles consideredDifferent obstacles considered
Objectives:Objectives:
quantification of existing ventilation quantification of existing ventilation
to study 14 scenarios of heavy hydrogen leak to study 14 scenarios of heavy hydrogen leak
optimization and improvement of ventilation systemoptimization and improvement of ventilation system
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1st floor
RdC
Geometry presentationGeometry presentationGeometry presentationGeometry presentation
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Lateral view
Top view
3D View
Blow duct
Extraction duct
1st floor
RdC
reservoirs
Mesh usedMesh usedMesh usedMesh used
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Recirculationzone
blowing
Velocity in 2 vertical planesVelocity in 2 vertical planesVelocity in 2 vertical planesVelocity in 2 vertical planes
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blowing
Velocity in 2 horizontal planesVelocity in 2 horizontal planesVelocity in 2 horizontal planesVelocity in 2 horizontal planes
Recirculation zone
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blowing
blowing
Velocity in 2 section planesVelocity in 2 section planesVelocity in 2 section planesVelocity in 2 section planes
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source
direction
concentrations of H2 on the planes
3D concentration contours of H2
HH22 leak: Concentration fields leak: Concentration fieldsHH22 leak: Concentration fields leak: Concentration fields
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source
concentrations of H2 on the planes 3D concentration contours of H2
Aspiration duct
HH22 concentration in the building concentration in the buildingHH22 concentration in the building concentration in the building
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A Case StudyA Case Study
Carrefour Mall Carrefour Mall ParkingParking
A Case StudyA Case Study
Carrefour Mall Carrefour Mall ParkingParking
Natural ventilation in a multi-storey parking:Natural ventilation in a multi-storey parking: Effectiveness in fire situationEffectiveness in fire situation
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Context and study objectivesContext and study objectives
Context :Context :
Extension of an existing buildingExtension of an existing building
Flow modification in the parkingFlow modification in the parking
Change in ventilation conditions Change in ventilation conditions
Objectives:Objectives:
Evaluate new ventilation alternatives in case of vehicle Evaluate new ventilation alternatives in case of vehicle
fire in the parkingfire in the parking
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Study flowStudy flow
Geometry and mesh creationGeometry and mesh creation
Simulation of a case without fire Simulation of a case without fire
Obtaining a steady result Obtaining a steady result
Using this result as CI for the simulations with fireUsing this result as CI for the simulations with fire
Simulation of 2 scenarios with fire Simulation of 2 scenarios with fire
Identical power : 8 MW (1 big heavy vehicle or 2 small heavy Identical power : 8 MW (1 big heavy vehicle or 2 small heavy
vehicles)vehicles)
2 different positions 2 different positions
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Parking and its surroundingsParking and its surroundings
Initial building
Presence of the extension modifies flow in the parking
Geometry creation Geometry creation and Mesh generationand Mesh generationGeometry creation Geometry creation
and Mesh generationand Mesh generation
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Numerical model of the parkingNumerical model of the parking
Ramp towards the adjoining parking
Escalators
Access ramps to floors & walls
Staircase
Block representing the cars
Wall around the floors
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Velocity field in the domainVelocity field in the domain
Velocity field at z=8m
Parking : weakvelocity zone
Building: obstacle
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Velocity field in the parkingVelocity field in the parking
Sections along the X axis
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Velocity vectors in the parkingVelocity vectors in the parking
Z=1mZ=5mZ=7mZ=11.3m
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Ground floorGround floor
Absence of vehicles in Absence of vehicles in
the lane reserved for the lane reserved for
firemenfiremen
Fire position in a Fire position in a
weak velocity zoneweak velocity zone
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Smoke evolutionSmoke evolution
Iso-surface of CO2 mass concentration = 0.2
t=100 s
t=300 s
t=610 s
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Temperature fieldsTemperature fields
t = 100 st = 300 st = 600 s
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Temperature field : StratificationTemperature field : Stratification
t = 300 s
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A Case StudyA Case Study
Ventilation in industrial premisesVentilation in industrial premises
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ContextContext
Efficiency of the air filtersEfficiency of the air filters
Complex ventilation system (suction, blowing and Complex ventilation system (suction, blowing and
filter)filter)
Weak rate of emissionWeak rate of emission
2 species (NH2 species (NH33 & H & H22S)S)
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GeometryGeometry
Suction
Blower
Filter
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Results: HResults: H22S concentrationS concentration
3D view of H2S concentration
Concentration at the top
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Results: NHResults: NH3 3 distributiondistribution
3D View
Concentration distribution in a plane
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Ventilation in industrial premises and Ventilation in industrial premises and waste treatmentwaste treatment
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Study contextStudy context
Industrial waste treatment Industrial waste treatment
Pollutant emissions harmful to man Pollutant emissions harmful to man Threshold Threshold
« Health »« Health »
Explosive gases Explosive gases Lower explosive limitLower explosive limit
Evaluation of proposed ventilation capabilitiesEvaluation of proposed ventilation capabilities
Optimisation of future extraction systemsOptimisation of future extraction systems
Pollutant
ppmv Mass Fraction
LEL 21500 43.586e-3
Health 500 1.014e-3
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Geometry and emission sourcesGeometry and emission sources
Pumping the shafts
Shaft sections Storage bucket
Closed doors
Emptying shafts
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Ventilation setupVentilation setup
Valves ceiling
Extractors (ground)
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Domain Mesh Domain Mesh
ZOOM
Non conformed mesh
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Results : isosurface 500 ppmResults : isosurface 500 ppm
Health threshold
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Pollutant mass fractionPollutant mass fraction
Horizontal plane at 80 cm from the ground
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Velocity Distribution Velocity Distribution
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Fresh air flow from valvesFresh air flow from valves
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FOR MORE INFORMATION….FOR MORE INFORMATION….
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