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Water Pollution in the Meandering River, Ansys Fluent Training

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In this project,  water pollution entry into the meandering river has been simulated and the results have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Introduction

Water pollution is the contamination of water bodies, usually due to human activities, in such a manner that negatively affects its legitimate uses. Pollution spread reduces the body of water to provide the ecosystem services that it would otherwise provide. Water pollution can be classified as surface water pollution or groundwater pollution.

Water

Water Pollution Project Description

In this project, a numerical simulation of pollution of the meandering river has been done using Ansys Fluent software. The VOF model has been used to simulate and solve the two-phase flow field equations. Pollutant enters the river from two circular inlet profiles somewhere at the beginning of the river, and it diffuses into the water. Due to its density which is lower than water density, pollutants cause the river’s surface to be polluted, and because of the water flow, pollution moves along the river.

Geometry & Mesh

The 3-D geometry of the present model is generated using Design Modeler software. The river’s width at the inlet is 14.035 m, and the pollutant inlet has two circular profiles with a diameter of 3 m.

Water

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured in all of the computational domains, and the element number is equal to 762,433.

WaterWater

CFD Simulation Settings

We consider several assumptions to simulate the present model:

  1. Due to the incompressibility of the flow, the pressure-based solver method has been selected.
  2. The simulation is transient.
  3. The gravity effect is considered equal to -9.81 m.s-2 on Y-axis

The K-epsilon Realizable viscous model with scalable wall function has been used to solve the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for Momentum, and the first-order upwind discretization method has been used for Turbulent kinetic energy and Turbulent dissipation rate.

Mr CFD

The following table represents a summary of the defining steps of the problem in this project and its solution:

Models
Multiphase
Homogeneous model Volume of fluid
Number of Eulerian phases 3(air, water & pollutant)
VOF sub-models Open channel flow
Interface modeling Sharp
Formulation Implicit
Viscous
k-epsilon Realizable
Near wall treatment Scalable wall functions
Material Properties
Air
Density 1.225
viscosity 1.7894e-05
water-liquid
Density 998.2
viscosity 0.001003
Pollutant
Density 670
viscosity 0.001003
Cell zone conditions
Operation conditions
Operating density method User-input
Operating density 1.225
Boundary conditions
Inlet_water Velocity inlet
Water volume fraction 1
Velocity magnitude 35 m/s
Pollutant inlet Velocity inlet
Velocity magnitude 5 m/s
Pollutant volume fraction 1
Free surface Pressure outlet
Multiphase Open channel
Outlet water
Water backflow volume fraction 1
Methods
Pressure-Velocity Coupling SIMPLE
Pressure PRESTO
Momentum Second-order upwind
Turbulent kinetic energy First-order upwind
Turbulent dissipation rate First-order upwind
Volume fraction Compressive
Initialization
Initialization methods Standard(From inlet_water)
Patch Phase water
Variable   Volume Fraction
Zones to patch Fluid-flow
Value 1
Run calculation
Time step size 0.005
Max iterations/time step 20
Number of time steps 1100

Results

After the solution process is completed, contours of velocity, pressure, pollutant volume fraction, Water volume fraction, Eddy viscosity, and streamline are extracted and presented below. As can be seen, the pollutant enters the river from two circular inlet profiles and diffuses through time into the river’s surface. Due to the water flow, pollution spreads through the river’s surface and causes massive river pollution.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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