Centrifuge CFD Simulation, Air/Water (Mixture) Two-Phase Flow
In this project, effect of steady rotation of centrifugal turbine on water and air two-phase mixture is investigated.
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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
- 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)|
|Number of eulerian phases||Two|
|Volume fraction parameters||Implicit|
|Phase interaction||Drag (schiller-naumann)|
|Slip velocity||Manninen et al.|
|RNG option||Swirl dominated flow|
|Near wall treatment||Standard wall function|
|Materials (Centrifugal Turbine)|
|Air||Definition method||Fluent Database|
|Water||Definition method||Fluent Database|
|Cell zone conditions (Centrifugal Turbine)|
|Rotational velocity||500 rpm|
|Boundary conditions (Centrifugal Turbine)|
|Gauge pressure||0 atm|
|Solver configurations (Centrifugal Turbine)|
|Spatial discretization||Gradient||Least square cell-based|
|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.