fluidyn-VENTCLIM Fluidyn-VENTIL-VENTCLIMFluidyn-VENTIL-VENTCLIM For Ventilation, Smoke evacuation and Air – conditioning Modelling - VENTCLIM fluidyn-VENTCLIM

Application Domains 3D Modeling tool 3D Modeling tool Simulation of internal flows Simulation of internal flows Sanitary ventilation (estimation of Sanitary ventilation (estimation of pollutant concentrations ) pollutant concentrations ) Emergency ventilation in fire situations Emergency ventilation in fire situations

fluidyn-VENTCLIM Physical and Numerical Models Conduction – convection - radiation Conduction – convection - radiation Navier-Stokes equations Navier-Stokes equations Finite volumes method Finite 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, coalescence evaporation, break-up, coalescence Pollutant sources Pollutant sources

fluidyn-VENTCLIM ResultsResults 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, …)

fluidyn-VENTCLIM 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

fluidyn-VENTCLIM Geometry creation (2)

fluidyn-VENTCLIM 3D view of the geometry

fluidyn-VENTCLIM Pollutant sources (1) Sources: point general surface Filters: cylindrical box Possible actions

fluidyn-VENTCLIM Pollutant sources (2) Pollutant source parameters Pollutants released Mass flow rate Temperature Instant of release Release duration

fluidyn-VENTCLIM Boundary conditions Conditions inside the domain Conditions outside the domain Parameters : Humidity rate Temperature

fluidyn-VENTCLIM Mesh generation parameters Mesh refining parameters Select: Uniform / non-uniform Select: Manual control / auto Control parameters

fluidyn-VENTCLIM Example of results

fluidyn-VENTCLIM Fluidyn-VENTIL: Mesh Generation using GUI 1D-3D coupling & pre-meshed entities

fluidyn-VENTCLIM 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

fluidyn-VENTCLIM Characteristics of the three modes in Fluidyn-VENTIL: 1D MODE for ventilation network Flow is one-dimensional with effects of the wall roughness 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 turnings not properly resolved. 3D MODE for local complex geometries Full 3D flow. Most accurate, however, computationally more expensive. 3D-1D HYBRID MODE 3D-1D coupled flow. Proper interpolation at 3D-1D mesh interface. Computationally economical than full 3D. Ventilation ducts modelling

fluidyn-VENTCLIM 1D mesh 3D Unstructured mesh

fluidyn-VENTCLIM Geometry Features Sub – options for tracing and modifying the Geometry Features Sub – options for tunnel/ducts GUI for Geometry Definition

fluidyn-VENTCLIM Mine Shafts Tunnels, ducts 3-D 1-D 3-D Case Setup

fluidyn-VENTCLIM Input data for Geometry GUI for Geometry Data

fluidyn-VENTCLIM Menu options for ‘Fluid Data Base’ List of Fluid Fluid Database Menu

fluidyn-VENTCLIM Tunnel connectivity using Sphere Attachment of ducts with shafts or major conduits 3D mesh 1D mesh Meshing of network – 1D & 3-D

fluidyn-VENTCLIM Spherical Connection between ducts

fluidyn-VENTCLIM Connection between shaft and ducts

fluidyn-VENTCLIM Connection between shaft and ducts Grid and contour option

fluidyn-VENTCLIM A Case Study Ventilation and fire in a train compartment A Case Study Ventilation and fire in a train compartment

fluidyn-VENTCLIM 2 phases : Experimental validation: fire simulation in confined Experimental validation: fire simulation in confined spaces spaces Test experiments: test compartment with seats and Test experiments: test compartment with seats and ventilation system ventilation system comparison of simulation results with comparison of simulation results with experimental results experimental results Simulation of an entire wagon Simulation of an entire wagon complex geometries complex geometries multiple boundary conditions multiple boundary conditions ventilation system ventilation system Fire in a train compartment

fluidyn-VENTCLIM Case presentation Entry B Entry A Exit B Exit A

fluidyn-VENTCLIM Location of monitor pointsComparison with experiment Comparison with experiments

fluidyn-VENTCLIM Geometry and boundary conditions Entire wagon : boundary conditions

fluidyn-VENTCLIM Velocity vectors : transverse section

fluidyn-VENTCLIM Temperature fields

fluidyn-VENTCLIM A Case Study Ventilation in a nuclear building A Case Study Ventilation in a nuclear building

fluidyn-VENTCLIM Ventilation in a nuclear building Study specifications: Ventilation study in a building of around 1000 m 3 Ventilation study in a building of around 1000 m 3 Installations distributed in 2 floors and a dome on the roof Installations distributed in 2 floors and a dome on the roof Different obstacles considered Different 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 system optimization and improvement of ventilation system

fluidyn-VENTCLIM 1 st floor RdC Geometry presentation

fluidyn-VENTCLIM Lateral view Top view 3D View Blow duct Extraction duct 1 st floor RdC reservoirs Mesh used

fluidyn-VENTCLIM Recirculation zone blowing Velocity in 2 vertical planes

fluidyn-VENTCLIM blowing Velocity in 2 horizontal planes Recirculation zone

fluidyn-VENTCLIM blowing Velocity in 2 section planes

fluidyn-VENTCLIM source direction concentrations of H 2 on the planes 3D concentration contours of H 2 H 2 leak: Concentration fields

fluidyn-VENTCLIM source concentrations of H 2 on the planes 3D concentration contours of H 2 Aspiration duct H 2 concentration in the building

fluidyn-VENTCLIM A Case Study Carrefour Mall Parking A Case Study Carrefour Mall Parking Natural ventilation in a multi-storey parking: Effectiveness in fire situation Effectiveness in fire situation

fluidyn-VENTCLIM Context and study objectives Context : Extension of an existing building Flow modification in the parking Change in ventilation conditions Objectives: Evaluate new ventilation alternatives in case of vehicle fire in the parking

fluidyn-VENTCLIM Study flow Geometry and mesh creation Simulation of a case without fire Obtaining a steady result Obtaining a steady result Using this result as CI for the simulations with fire Using this result as CI for the simulations with fire Simulation of 2 scenarios with fire Identical power : 8 MW (1 big heavy vehicle or 2 small heavy vehicles) Identical power : 8 MW (1 big heavy vehicle or 2 small heavy vehicles) 2 different positions 2 different positions

fluidyn-VENTCLIM Parking and its surroundings Initial building  Presence of the extension modifies flow in the parking Geometry creation and Mesh generation Geometry creation and Mesh generation

fluidyn-VENTCLIM Numerical model of the parking Ramp towards the adjoining parking Escalators Access ramps to floors & walls Staircase Block representing the cars Wall around the floors

fluidyn-VENTCLIM Velocity field in the domain Velocity field at z=8m Parking : weak velocity zone Building: obstacle

fluidyn-VENTCLIM Velocity field in the parking Sections along the X axis

fluidyn-VENTCLIM Velocity vectors in the parking Z=1m Z=5m Z=7m Z=11.3m

fluidyn-VENTCLIM Ground floor Absence of vehicles in the lane reserved for firemen Fire position in a weak velocity zone

fluidyn-VENTCLIM Smoke evolution Iso-surface of CO 2 mass concentration = 0.2 t=100 s t=300 s t=610 s

fluidyn-VENTCLIM Temperature fields t = 100 st = 300 s t = 600 s

fluidyn-VENTCLIM Temperature field : Stratification t = 300 s

fluidyn-VENTCLIM A Case Study Ventilation in industrial premises

fluidyn-VENTCLIM Context Efficiency of the air filters Complex ventilation system (suction, blowing and filter) Weak rate of emission 2 species (NH 3 & H 2 S)

fluidyn-VENTCLIM Geometry Suction Blower Filter

fluidyn-VENTCLIM Results: H 2 S concentration 3D view of H2S concentration Concentration at the top

fluidyn-VENTCLIM Results: NH 3 distribution 3D View Concentration distribution in a plane

fluidyn-VENTCLIM Ventilation in industrial premises and waste treatment

fluidyn-VENTCLIM Study context Industrial waste treatment Pollutant emissions harmful to man  Threshold « Health » Pollutant emissions harmful to man  Threshold « Health » Explosive gases  Lower explosive limit Explosive gases  Lower explosive limit Evaluation of proposed ventilation capabilities Optimisation of future extraction systems Pollutant ppmvMass Fraction LEL e-3 Health e-3

fluidyn-VENTCLIM Geometry and emission sources Pumping the shafts Shaft sections Storage bucket Closed doors Emptying shafts

fluidyn-VENTCLIM Ventilation setup Valves ceiling Extractors (ground)

fluidyn-VENTCLIM Domain Mesh ZOOM Non conformed mesh

fluidyn-VENTCLIM Results : isosurface 500 ppm Health threshold

fluidyn-VENTCLIM Pollutant mass fraction Horizontal plane at 80 cm from the ground

fluidyn-VENTCLIM Velocity Distribution

fluidyn-VENTCLIM Fresh air flow from valves

fluidyn-VENTCLIM 146, Ring Road, Sector 5, H.S.R LAYOUT BANGALORE INDIA  :  : , boulevard de la Libération SAINT-DENIS FRANCE  :  : Fluidyn Client Suppport Centres

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