Pollution Spread in the Stagnant River, Ansys Fluent Training

Description

The present study investigates the pollution entry into a stagnant river by ANSYS Fluent software. One of the environmentalists’ concerns is the water pollution caused by factories. If the chemical waste products from industrial processes discharge into rivers, It would be perilous for aquatic animals. Furthermore, these pollutions enter the human food chain and cause disease.

The present model is designed in three dimensions using Design Modeler software. The river’s width at the inlet is 11.05 m. The meshing of the model has been done using ANSYS Meshing software. The element number is 161562.

Also, due to the nature of the problem, the transient solver is enabled.

Pollution Methodology

The VOF multiphase model is used to simulate the phases of water and pollutant. Pollutant enters the river from a nonuniform profile somewhere in the middle of the river and diffuses into the water.

Due to its density which is lower than water density, it floats on the free surface of the river. 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, and the second-order upwind discretization method has been used. As mentioned, the water inside the river is stagnant, and pollution enters the river with a velocity of 8m/s.

Pollution Conclusion

After the solution process is completed, contours of velocity, pressure and pollutant volume fraction are extracted and presented below. As observed, the pollutant diffuses through time into the river’s water, and the pressure near the pollutant inlet is higher than in other areas.

Moreover, as we know, water pressure increases with depth shown in the cross-sectional pressure contour.