fluidyn-FLOWSOLMarch 20063D numerical simulation of surface flows

fluidyn-FLOWCOASTIntroductionWater quality : environment protection water distribution industrial emissions

Accidental pollution increase

Numerical simulation of pollutant species in rivers and seas

fluidyn-FLOWCOASTfluidyn-FLOWOILOil (non-miscible) pollutionfluidyn-FLOWPOLMiscible pollution2 Modules

fluidyn-FLOWCOASTNumerical model Based on CFD : Navier Stokes 3D equations Mixing and stratification in near and far fields. Transient phenomena (tides) Degrading down to 1D or 2D possible

fluidyn-FLOWCOASTFeatures Interactive generation of bathymetry Automatic generation of curvilinear mesh Transient boundary conditions (water levels and flow rates) Effects of wind, dissolution, evaporation Pollutant transport and dispersion Density variation (Boussinesq), salinity, temperature stratification (thermal plumes). Chemical database Islands and obstacles (bridges, dams, etc).

fluidyn-FLOWCOASTFeatures

fluidyn-FLOWCOASTInput data Bathymetry (linear and transverse sections). Roughness (based on Manning coefficient). Slope. Upstream and downstream hydraulic conditions (water and height). Emission data (time, massvariable with respect to time) Product characteristics (density, lifetime, diffusion coefficients).

Application examplesSimulation of an oil slick in the Tamise estuaryfluidyn-FLOWOILfluidyn-FLOWCOAST

Case descriptionfluidyn-FLOWCOAST The main objective of this study is to analyze the environmental consequences of a crude petrol leak in the Tamise. The leak is accidental and due to a canalization rupture in a Tanker The source is situated near a river bank The flow in the Tamise estuary is influenced by the tide cycles

Study domainfluidyn-FLOWCOASTBathymetric Contours

Numerical Model of the terrainfluidyn-FLOWCOAST

Bathymetric contoursfluidyn-FLOWCOAST

Terrain and Flow datafluidyn-FLOWCOAST The maximum depth reached in the estuary is 14.8 m.

The bathymetric bottom is sandy with a D50 of 1.5 mm.

The Manning roughness coefficient is taken at 0.1.

The flow boundary conditions are unsteady and variable with respect to the tide cycles

Emission datafluidyn-FLOWCOAST Fluid : Crude Quantity : 1000 tons Fluid density : 900 Kg/m3 (at 150 C) Kinetic viscosity : 0.00134 m2/s Ambient air temperature : 13 C Lifetime The product source is a pipeline of diameter 40 cm

3D Meshfluidyn-FLOWCOAST

Study of currentsfluidyn-FLOWCOASTSurface velocity vectors after 1 hour

Study of currentsfluidyn-FLOWCOASTSurface velocity vectors after 2 hours

Study of currentsfluidyn-FLOWCOASTSurface velocity vectors after 4 hours

fluidyn-FLOWCOASTSurface velocity vectors after 6 hoursStudy of currents

fluidyn-FLOWCOASTSurface velocity vectors after 8 hoursStudy of currents

Dispersionfluidyn-FLOWCOASTConcentration after 2 hours

fluidyn-FLOWCOASTConcentration after 4 hoursDispersion

fluidyn-FLOWCOASTConcentration after 6 hoursDispersion

fluidyn-FLOWCOASTConcentration after 8 hoursDispersion

Examplefluidyn-FLOWCOASTfluidyn-FLOWPOLDispersion of pollutant layer in the river Seine

Case descriptionfluidyn-FLOWCOAST Linear hydrocarbons over 5 km. Presence of an island. Injection of 21.54 kg of Rhodamine during 57 min. Expected results: transport time distribution between the two arms of the river evolution of transversal distribution in course of time

Domain and bathymetryfluidyn-FLOWCOASTBathymetry generation from 10 cross profiles

3D Meshfluidyn-FLOWCOAST100 grids lengthwise, 15 width wise, 6 in depth.Unrefined structured curvilinear mesh

fluidyn-FLOWCOASTBetween the injection point and the island: no curvatures or major bathymetric variations : relatively invariant hydrological fields.From the island tip : brusque variation in bathymetry: influences the tracer distribution.Study of currents

Dispersionfluidyn-FLOWCOASTConcentration after 2 and 6 hours

Concentration after 8 and 10 hoursDispersionfluidyn-FLOWCOAST

Examplefluidyn-FLOWCOASTfluidyn-FLOWPOLDispersion of industrial effluents in the Seine

Contextfluidyn-FLOWCOAST Industrial effluent discharge in Seine waters

Designing an immersed diffuser (type of emission) to limit the effluent concentration in the Seine

Methodologyfluidyn-FLOWCOAST 3D numerical modeling of flow in Seine Addition of emission sources (diffusers) Monitoring effluent concentrations Selection of diffuser to install

Geometryfluidyn-FLOWCOASTGeometry / bathymetry construction from IGN map and the cross profiles of the Seine over the selected zone (28 along the plot)

Meshfluidyn-FLOWCOAST 3D curvilinear, unstructured mesh in order to conform to the bathymetry Fine mesh at emission source levelInput section mesh (upstream limit)Output section mesh (downstream limit)

Meshfluidyn-FLOWCOASTSurface mesh

Hydraulic datafluidyn-FLOWCOASTModeling 2 currentology situations

Mean situation Water level situationMean flow80,6 m3/sWater flow14,7 m3/sWater height60,66 NGF (lNormal Retention level )Water height60,66 NGF (Normal Retention level)

Study of currentsfluidyn-FLOWCOASTSurface velocity fields(m/s) Velocity fields (m/s) at river bed

Study of currentsfluidyn-FLOWCOASTVelocity fields (m/s) at the inletVelocity fields (m/s) at outlet

Emission Datafluidyn-FLOWCOASTMany outlet types and positions possible

Emission datafluidyn-FLOWCOAST

Dispersion resultsfluidyn-FLOWCOASTSurface concentration contours in mg/l Outlet concentration contours in mg/l

Dispersion resultsfluidyn-FLOWCOASTConcentration iso-surface in mg/l

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