### The Design – Modelling of Compressor or Pressure Impeller – Cavitation | ANSYS Fluent

This simulation is about a Compressor or Pressure Impeller with cavitation via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

One of the most widely used compressors in the industry is the centrifugal type compressor. This centrifugal compressor, sometimes called impeller compressor or radial compressor, is a sub-class of dynamic axisymmetric work-absorbing turbomachinery.

They achieve pressure rise by adding energy to the continuous flow of fluid through the rotor/impeller. The following equation shows this specific energy input. A substantial portion of this energy is kinetic which is converted to increased potential energy/static pressure by slowing the flow through a diffuser. The static pressure rise in the impeller may roughly equal the increase in the diffuser.

This compressed air then exits radially from the diffuser section around the compressor. Only one of the blades is modeled to simplify and reduce the computational cost due to the compressor’s symmetrical structure and the geometric similarity of the compressor blades.

Each blade’s geometric model consists of an in block (connected to input) and a passage (connected to output). Two covers, called hub and shroud, are placed on either side of each blade; So that the blades are located in the space between the two covers.

The compressor blade rotates around its central axis (x-axis) at a rotational speed of 2500 rpm. The cause of the diffuser in the air path leaving each blade is the increase in air pressure. When the fluid exits the central part of the compressor, it has kinetic energy and potential.

Since the amount of pressure changes in the passing fluid is inversely related to the square of the fluid velocity (according to the Bernoulli relation), it should be tried to reduce the compressor blades’ output velocity to increase the amount of outlet fluid pressure.

This increase in pressure helps to increase the working efficiency of the compressor. Therefore, a diffuser is used in the compressor; Because the cross-section of the fluid passage increases, and with increasing the cross-sectional area of the passage, the passage velocity decreases, and finally, as the fluid velocity decreases, the outlet fluid pressure increases.

This analysis has tried to simulate and analyze the modeling of compressor or pressure impeller-cavitation using ANSYS Fluent software.

### Geometry & Grid

The geometry required for this analysis has been generated by ANSYS Design Modeler software. The meshing required for this analysis is also generated by ANSYS Meshing software. The mesh type used in this analysis is an automatic method and the volume properties of the geometry model for this rotary design modeler geometry are 4,1661e+005 mm³.

### Model

In this analysis, the k-omega (2 equation) turbulence viscosity model is used to check the fluid flow. The standard wall function is used near the wall. In this analysis, the moving wall method is used to model the rotation.

### Boundary Condition

In this analysis, the output flow type is Mass Flow Rate and the gauge pressure is equal to 0 Pa.

### Discretization of Equations

According to the type of flow, the SIMPLEC algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Second Order Upwind.

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