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

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 :

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.

FLOOIL MODELING FEATURES

 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

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

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.

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

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

GRAPHICAL MENU INTERFACE

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

Terrain Features Topography Options FLOOIL

Fluid Properties Flow FLOOIL

Oil Characteristics FLOOIL

Spill Process Spill Mechanism FLOOIL

Shore Type Nature of River bund FLOOIL

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

Landscape View FLOOIL

Velocity Vectors View FLOOIL

Contours filled mode View FLOOIL

Contours line mode View FLOOIL

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

Grid out ( Outer boundary of mesh ) View FLOOIL

Graphs View FLOOIL

INPUT DATA REQUIRED FLOOIL

 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

OUTPUT FLOOIL

 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

Oil Slick in River Thames near Coryton Case Study FLOOIL

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

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

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

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

Bathymetry Generated by FLOOIL (Using bathymetric contours) FLOOIL

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 : m 2 /s  Surface Tension : 30 dynes/m  Ambient Air Temperature : 13 0 C  Dissolution Constant : (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

Location of Oil Slick FLOOIL

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

2-D View of the Computational Grid FLOOIL

3-D View of Computational Grid FLOOIL

Flow Velocity Vectors after 2 hrs of Simulation FLOOIL

Flow Velocity Vectors after 4 hrs of Simulation FLOOIL

Flow Velocity Vectors after 6 hrs of Simulation FLOOIL

Flow Velocity Vectors after 8 hrs of Simulation FLOOIL

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

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

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

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