Water Pollution in the Meandering River, Ansys Fluent Training
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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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 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.
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.
CFD Simulation Settings
We consider several assumptions to simulate the present model:
- Due to the incompressibility of the flow, the pressure-based solver method has been selected.
- The simulation is transient.
- 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.
The following table represents a summary of the defining steps of the problem in this project and its solution:
|Homogeneous model||Volume of fluid|
|Number of Eulerian phases||3(air, water & pollutant)|
|VOF sub-models||Open channel flow|
|Near wall treatment||Scalable wall functions|
|Cell zone conditions|
|Operating density method||User-input|
|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|
|Water backflow volume fraction||1|
|Turbulent kinetic energy||First-order upwind|
|Turbulent dissipation rate||First-order upwind|
|Initialization methods||Standard(From inlet_water)|
|Zones to patch||Fluid-flow|
|Time step size||0.005|
|Max iterations/time step||20|
|Number of time steps||1100|
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.