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Centrifuge CFD Simulation, Air/Water (Mixture) Two-Phase Flow

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In this project, effect of steady rotation of centrifugal turbine on water and air two-phase mixture is investigated.

This product includes Mesh file and a Training Movie.

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Centrifuge Problem description

In this project, effect of steady rotation of centrifugal turbine on water and air two-phase mixture is investigated. Multi-phase MIXTURE model is used to solve water and air phases interactions. Secondary phase (air) volume fraction has very low values in the 0.0001 order which proves the validity of mixture multi-phase model in this project, since for applying the Mixture Multi-Phase model the secondary phase volume fraction should be less than 15%.slip velocity has been taken into account at water and air contact interface. Diameter of air bubbles are considered equal 1 µm. Rotating region of turbine is considered as a separate body which rotates with rotational speed equal to 500 rpm which simulates the rotation of centrifugal turbine at the same rate.

Centrifuge Geometry and mesh

Geometry of fluid domain is designed in Design modeler and computational grid is generated using Ansys meshing. Mesh type is unstructured and element number is 126000.


Solver configuration for Centrifuge CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is considered in positive Z direction equal to 9.84 m/s2.

The following table a summary of the defining steps of the problem and its solution.

Models (Centrifugal Turbine)
Multiphase Model Mixture
Slip velocity Activated
Number of eulerian phases Two
Volume fraction parameters Implicit
Interface modeling Dispersed
Primary phase Water
Secondary phase air
Phase interaction Drag (schiller-naumann)
Slip velocity Manninen et al.
Viscous k-epsilon RNG
RNG option Swirl dominated flow
Near wall treatment Standard wall function
Materials (Centrifugal Turbine)
Air Definition method Fluent Database
Material name Air
Density 1.225 kg/m3
Viscosity 1.7894e-05 kg/m.s
Water Definition method Fluent Database
Material name Water
Density 998.2 kg/m3
Viscosity 0.001003 kg/m.s
Cell zone conditions (Centrifugal Turbine)
Turbine Material name mixture
Frame motion On
Rotational velocity 500 rpm
Boundary conditions (Centrifugal Turbine)
Outlet Type Pressure outlet
Gauge pressure 0 atm
Solver configurations (Centrifugal Turbine)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure PRESTO!
Momentum First order Upwind
Volume fraction First order Upwind
Turbulent kinetic energy First order Upwind
Turbulent dissipation energy First order Upwind
Initialization Gauge pressure 0 Pa
X velocity 0 m/s
Y velocity 0 m/s
Z velocity 0 m/s
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3

Results and discussion

Rotation of centrifugal turbine with rotational speed of 500 rpm results in fluid movement with velocity equal to 0.62 m/s at close ranges of turbine. Water bubbles are captured under the turbine which increases the secondary phase (air) volume fraction in these regions.

There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.


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