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Twin Screw Pump, ANSYS Fluent CFD Simulation Training

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The present problem simulates the pumping of highly viscous fluid (i.e., Glycerin).

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Description

Introduction

A twin screw pump is a positive displacement pump, meaning that the pump transfers a particular volume of product according to the speed and pitch of the screws. While turning, the two screws are forming closed chambers that are moving in an axial direction. This movement creates a vacuum at the inlet boundary and positive pressure at the outlet. Due to this double chamber technic, there is an almost pulsation-free working with high and low viscosity products. In other words, screw pumps operate using two counter-rotating screw rotors which are engineered so that they rotate “towards each other.” This traps the gas in the space between the “screws” of their rotors. As the screws rotate, this trapped volume decreases, which compresses the fluid and moves it towards the exhaust.

Twin Screw Pump

Project description

The present problem simulates the pumping of highly viscous fluid (i.e., Glycerin) by ANSYS Fluent software. In this project, the glycerin fluid is sucked inside the computational domain due to the rotation of screws. The twin-screw pump increases the pressure of the Glycerin and pushes it toward the outlet. The RNG k-epsilon model is exploited to solve the turbulent flow equations. Also, it should be noted that the Mesh Motion option was enabled to simulate the rotating motion of screws, and the rotation velocity of the rotating domains was set to 3 rad/s.

Twin Screw Pump Geometry and Mesh

The geometry of this project was designed in Solidworks and then edited in ANSYS design modeler and contains two rotating zones and one stationary zone (pump crust). The meshing is carried out in ANSYS meshing. The mesh type used for this geometry is unstructured, and the element number is 1184161.

Twin Screw PumpTwin Screw Pump

Twin Screw Pump CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using a pressure-based solver.
  • The present simulation and its results are transient.
  • The effect of gravity has been taken into account.

The applied settings are summarized in the following table.

 
Models
Viscous model k-epsilon
Model RNG
Near wall treatment Standard wall function
Cell zone condition
Screw1 & screw2 Mesh motion
Rotational velocity 3 rad/s
Boundary conditions
Inlet pressure inlet
Gauge pressure 0 Pa
Outlet outflow
Walls Stationary wall
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization Pressure Second-order
Momentum second-order upwind
Turbulent kinetic energy first-order upwind
Turbulent dissipation rate first-order upwind
Initialization
Initialization method   Standard
gauge pressure 0 Pa
Velocity (x,y,z) (0,0,0) m/s
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3

Twin Screw Pump Results and Discussion

After the simulation process is finished, Contours of pressure, velocity, streamlines, etc., are obtained and presented.

As can be seen in pressure contours, as the screws start rotating, the fluid is sucked from the inlet and pushed toward the outlet while its pressure increases.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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