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fluidyn FLOWCOAST FLOOIL 3D Fluid Dynamics Model to Simulate Oil slick movement in coastal waters or rivers FLOOIL

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FLOOIL 3D Fluid Dynamics model to Simulate Flow and Oil transport in water bodies like river, estuaries and coastal area. It uses Computational Fluid Dynamics tools in a finite difference based approach to solve the differential equations governing mass, momentum and energy transfer. Finite Difference scheme has been used to compute the mass fluxes and oil spill transport. The effects due to wind at the surface and bed roughness at the bottom have been taken into account. FLOOIL has built-in models to account for density variation due to Oil Spill and BFC Grid Generation technique to take into account the curved flow boundaries. INTRODUCTION :

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FLOOIL FLOOIL can be used for simulating oil slick movement by considering the transportation of an oil slick due to advection spreading- evaporation and dissolution. FLOOIL can also consider the lateral flows and Oil discharges joining the flow domain at any location. The model can also be used for varying boundary values over the time at user specified locations. FLOOIL has special features to analyze time dependent velocity fields, Oil spill movement and water levels at user specified location.

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FLOOIL MODELING FEATURES

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Automatic BFC grid generation Implicit higher order finite difference scheme Oil discharge into main river reach at any location Boundary condition at user specified locations Time varying boundary condition Lagrangian model for oil slic removal: including effect of wind, dissolution, evaporation, emulsification FLOOIL

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Pre-processor : Digitization of domain, terrain, objects and meteorological stations by loading the BMP map. Save / Load terrain, meteorological, Oil sources and result files both in ASCII and BINARY format. Update the Oil database through menu. Load meshes in different formats load objects in Auto CAD DXF format Interactive selection of models. Loading either data in NWS format and in user-defined format. Interactive specification of boundary conditions. Manual control over simulation options. FLOOIL

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Post-processor : ( Viewing the Terrain with object masking facility ) Grid plots, Vector plots. Contour plot / Surface plots : line and filled. Plots of variables with distance on a plane. Trace plots of variables at monitor points. The values of a variable at any grid points.

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Applications : Navigational purpose. River maintenance works. Oil-slick transport. Purpose of the software in the field of the following areas : Coastal region. Seas, rivers and estuaries. Petro-chemical industries. FLOOIL

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User Interface : Menu Driven User – Friendly Easy to Use Online Help FLOOIL

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GRAPHICAL MENU INTERFACE

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Load or Save Files in ASCII / BINARY Format File Operations FLOOIL

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Terrain Features Topography Options FLOOIL

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Fluid Properties Flow FLOOIL

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Oil Characteristics FLOOIL

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Spill Process Spill Mechanism FLOOIL

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Shore Type Nature of River bund FLOOIL

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Simulation Output Options Flow parameters ( Velocities in X, Y, and Z directions) at start of Simulation. FLOOIL

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Landscape View FLOOIL

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Velocity Vectors View FLOOIL

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Contours filled mode View FLOOIL

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Contours line mode View FLOOIL

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Grid ( 1D, 2D or 3D) View FLOOIL

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Grid out ( Outer boundary of mesh ) View FLOOIL

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Graphs View FLOOIL

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INPUT DATA REQUIRED FLOOIL

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Topography of Water body. Fluid Properties. Flow Boundary Conditions. Chemical and Physical Characteristic of Oil Spill. Type of the Oil Source ( point, line, area or volume). Shore Type (like sand and Grave, Rock Shore ). FLOOIL

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OUTPUT FLOOIL

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Generated Grid and Bathymetry. Velocity vectors throughout the domain. Contours (lined and filled). Water level variation and Velocities. Contours of Oil Slick throughout the Domain. Graphical representation velocities, water levels and oil slick. FLOOIL

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Oil Slick in River Thames near Coryton Case Study FLOOIL

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Introduction: The main objective of the study is to analyze the fate of a large quantity of Crude oil spillage into the River Thames The Oil spill is due to the shipwreck of an Oil Tanker The location of the spillage is near Coryton The flow in River Thames varies with the tidal cycle FLOOIL

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Map of the region around the Spillage Site along the River Thames (from Canvey Island to Tilbury) FLOOIL

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Digitization of the Topographical/Hydrological features on the Map into FLOOIL

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Topographic/Hydrographic details: The maximum bathymetric depth in the river stretch considered for this study is 14.8 m The bathymetry is assumed to be sandy with a D50 of 1.5 mm The Manning’s Roughness coefficient is assumed as 0.1 Unsteady flow boundary Conditions, varying with tidal cycles, are used here. FLOOIL

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Bathymetry Generated by FLOOIL (Using bathymetric contours) FLOOIL

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Spill Details: Spilled Liquid : Crude Oil Amount of Spill : 1000 tons Spill Location : Near Coryton Oil Density : 900 Kg/m 3 (at 15 0 C) Kinematic Viscosity of Oil : 0.00134 m 2 /s Surface Tension : 30 dynes/m Ambient Air Temperature : 13 0 C Dissolution Constant : 0.0088 (g.m 2.hr) -1 Decay constant : 0.5 d -1 The source of spillage is assumed as an underwater pipeline of size 18 inches, carrying Crude oil. FLOOIL

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Location of Oil Slick FLOOIL

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Simulation Parameters: Computational Grid: 3-D Mesh of size 72 X 10 X 3 Duration of the Study: 3 days (72 hours) Flow Boundary Conditions : The boundary conditions were taken between Tilbury and Coryton (the flow variations due to the tidal cycles were taken into consideration) Removal Mechanisms Considered: All (Advection, Diffusion, Mechanical Spread, Dissolution, Evaporation, Shore Deposition and Emulsification) FLOOIL

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2-D View of the Computational Grid FLOOIL

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3-D View of Computational Grid FLOOIL

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Flow Velocity Vectors after 2 hrs of Simulation FLOOIL

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Flow Velocity Vectors after 4 hrs of Simulation FLOOIL

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Flow Velocity Vectors after 6 hrs of Simulation FLOOIL

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Flow Velocity Vectors after 8 hrs of Simulation FLOOIL

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Oil Volume (in m 3 ) after 2 hrs of Simulation FLOOIL

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Oil Volume (in m 3 ) after 4 hrs of Simulation FLOOIL

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Oil Volume (in m 3 ) after 6 hrs of Simulation FLOOIL

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Oil Volume (in m 3 ) after 8 hrs of Simulation FLOOIL

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