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

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

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

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, …) …)

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

Geometry creation (2)Geometry creation (2)

3D view of the geometry3D view of the geometry

Pollutant sources (1)Pollutant sources (1)

Sources: point general surface

Filters: cylindrical box

Possible actions

Pollutant sources (2)Pollutant sources (2)

Pollutant source parameters

Pollutants released

Mass flow rate

Temperature

Instant of release

Release duration

Boundary conditionsBoundary conditions

Conditions inside the domain

Conditions outside the domain

Parameters :Humidity rateTemperature

Mesh generation parametersMesh generation parameters

Mesh refining parameters

Select: Uniform / non-uniform

Select: Manual control / auto

Control parameters

Example of resultsExample of results

Fluidyn-VENTIL: Mesh Generation using GUI1D-3D coupling & pre-meshed entities

Ventilation duct modeling

1. Line mode (1D computational

For extensive network

2. 3D mode computational mesh

for detailed local geometry

3. 3D-1D Hybrid mode for

combining the two

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

1D mesh

3D Unstructured mesh

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

Case Setup

Input data for Geometry

GUI for Geometry Data

Menu options for ‘Fluid Data Base’

List of Fluid

Fluid Database Menu

Tunnel connectivity using Sphere

Attachment of ducts with shafts or major conduits

3D mesh

1D mesh

Meshing of network – 1D & 3-D

Spherical Connection between ducts

Connection between shaft and ducts

Grid and contour option

A Case StudyA Case Study

Ventilation and fire in a Ventilation and fire in a train compartmenttrain compartment

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

Case presentationCase presentationCase presentationCase presentation

Entry B

Entry A

Exit B

Exit A

Location of monitor points Comparison with experiment

Comparison with experimentsComparison with experimentsComparison with experimentsComparison with experiments

Geometry and boundary conditions

Entire wagon : boundary conditions Entire wagon : boundary conditions Entire wagon : boundary conditions Entire wagon : boundary conditions

Velocity vectors : transverse sectionVelocity vectors : transverse sectionVelocity vectors : transverse sectionVelocity vectors : transverse section

Temperature fieldsTemperature fieldsTemperature fieldsTemperature fields

Ventilation in a nuclear buildingVentilation in a nuclear building

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

1st floor

Geometry presentationGeometry presentationGeometry presentationGeometry presentation

Lateral view

Top view

3D View

Blow duct

Extraction duct

1st floor

reservoirs

Mesh usedMesh usedMesh usedMesh used

Recirculationzone

blowing

Velocity in 2 vertical planesVelocity in 2 vertical planesVelocity in 2 vertical planesVelocity in 2 vertical planes

blowing

Velocity in 2 horizontal planesVelocity in 2 horizontal planesVelocity in 2 horizontal planesVelocity in 2 horizontal planes

Recirculation zone

blowing

Velocity in 2 section planesVelocity in 2 section planesVelocity in 2 section planesVelocity in 2 section planes

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

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

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

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

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

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

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

Velocity field in the domainVelocity field in the domain

Velocity field at z=8m

Parking : weakvelocity zone

Building: obstacle

Velocity field in the parkingVelocity field in the parking

Sections along the X axis

Velocity vectors in the parkingVelocity vectors in the parking

Z=1mZ=5mZ=7mZ=11.3m

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

Smoke evolutionSmoke evolution

Iso-surface of CO2 mass concentration = 0.2

t=100 s

t=300 s

t=610 s

Temperature fieldsTemperature fields

t = 100 st = 300 st = 600 s

Temperature field : StratificationTemperature field : Stratification

t = 300 s

Ventilation in industrial premisesVentilation in industrial premises

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)

GeometryGeometry

Suction

Blower

Filter

Results: HResults: H22S concentrationS concentration

3D view of H2S concentration

Concentration at the top

Results: NHResults: NH3 3 distributiondistribution

3D View

Concentration distribution in a plane

Ventilation in industrial premises and Ventilation in industrial premises and waste treatmentwaste treatment

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

Geometry and emission sourcesGeometry and emission sources

Pumping the shafts

Shaft sections Storage bucket

Closed doors

Emptying shafts

Ventilation setupVentilation setup

Valves ceiling

Extractors (ground)

Domain Mesh Domain Mesh

Non conformed mesh

Results : isosurface 500 ppmResults : isosurface 500 ppm

Health threshold

Pollutant mass fractionPollutant mass fraction

Horizontal plane at 80 cm from the ground

Velocity Distribution Velocity Distribution

Fresh air flow from valvesFresh air flow from valves

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Fluidyn-VENTCLIM Fluidyn-VENTIL-VENTCLIMFluidyn-VENTIL-VENTCLIM For Ventilation, Smoke evacuation...

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