Item description

3D Simulation of two-phase flow (water, air ) in a channel

Multiphase flow is one of the most important and most widely used issues in mechanical engineering. The phase shift of a fluid or interaction of two different phases are widely seen in many industry or nature issues. Most industrial processes, such as power generation, cooling, and distillation, depend on evaporative and condensation cycles. Steel, paper production, all involve critical stages depending on the working conditions and equipment in multiphase mode. Most of the pollution projects can be simulated and analyzed using multiphase flows. The methods of analyzing two-phase flows follow all the basic rules of fluid mechanics.

In this project, it has been tried to simulate and analyze the three-dimensional, two-phase flow through an open channel with Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis consists of an open channel which contains a gap in the middle of the channel. The geometry has been designed in Ansys Design Modeler software. Also, meshing has been generated in Ansys Meshing software. The mesh type is structural according to the geometric shape of the channel. The total number of cells generated for this geometry is 214560.


For analyzing two-phase flow in this channel, the Two-Phase VOF model is used as Open Channel Flow. To analyze the flow turbulency generated by the interaction of this two-phase flow, the turbulence viscosity model K-Omega Standard has been used.

Boundary Condition

The flow inlet for this channel is defined as the mass flow rate for water at a value of 60 Kg/s. Flow outlet is also considered as Pressure-Outlet.

Discretization of equations

SIMPLE algorithm is used to solve the equations in this analysis. Also, the pressure-based solver is used to analyze the flow. The Second Order Upwind method is used to discretize the equations.

Finally, the results are also shown in forms of velocity and pressure contours.

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