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CFD Simulation of flow in a two-phase injector by ANSYS Fluent software

Multi-phase flow is one of the most important and most commonly used issues in mechanical engineering science. The phase change of a fluid or interaction of two different phases is widely seen in many industries or nature issues. Most industrial processes, such as power generation, cooling, and distillation, depend on evaporation and condensation cycles. Steel and paper production involves critical stages that rely on the conditions of work and equipment in multi-phase mode. Most of the pollution problems can be simulated and analyzed using multi-phase flows. The two-phase flow analysis methods follow all the fundamental laws of fluid mechanics.

In this project, we tried to simulate and analyze the flow in a two-phase injector using ANSYS Fluent software.

Geometry and grid

The geometry required for this analysis includes a combustion chamber and a special fuel injection injector and an air flow inlet. This geometry has been designed in Gambit software and meshed by the same software. The meshing made for this geometry is unstructured and the total number of cells created for this geometry is 932107.


To analyze this two-phase flow, the multi-phase model of MIXTURE has been used. To analyze the turbulence of the flow generated by the interaction of this two-phase, the K-epsilon standard turbulence viscosity model is used. The standard wall function is used near the wall.

Boundary Condition

The flow input for this geometry is defined in the injector section for fuel and air mixture in the form of PRESSURE INLET, but is defined for the fuel and air fluid separately as the Velocity Inlet boundary condition and its value is 20m/s. Output of the flow domain is also considered as a PRESSURE OUTLET for the combustion mixture.

Discretization of equations

The SIMPLE algorithm is used to solve the equations in this analysis. Also, a pressure-based solution for flow is used. The First Order Upwind method is used to discretize the equations.

At the end, the results are shown as velocity, pressure and temperature contours.

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