Discrete Phase Flow Trap (Trapper) by Gravity CFD Simulation
In this project, an attempt has been made to simulate and analyze the flow of a particle trapping mechanism called the discrete phase trap.
This ANSYS Fluent project includes CFD simulation files and a training movie.
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We deal with discrete Phase flows in various mechanical and engineering systems and their application is increasing. Therefore, in order to have more efficient systems, we must have a complete understanding of such flows. Multi phase flows were classified into different groups, one of which is dispersed multiphase flows, which is very common in engineering systems. dispersed multi phase flows include bubble flow, droplet flow, and particle flow. In such a flow, one phase is considered the carrier phase, in which particles, bubbles and droplets are dispersed and form other phases. CFD simulation plays a prominent role in optimizing the design of distributed multi phase flow systems.
In this project, an attempt has been made to simulate and analyze the flow of a particle trapping mechanism called the discrete phase trap. In order to simulate the particles, the discrete phase model is activated and Saffman lift force and pressure gradient forces are also applied to particles. Also, since the trapping mechanism mainly works with gravity, the gravity has been taken into account. The flow containing continuous and dispersed phases enters the computational domain with a speed of 5m/s and the standard k-epsilon model is exploited for solving fluid flow equations.
Geometry & Mesh
The geometry of this model is designed in ANSYS design modeler and meshed in ANSYS meshing software. The mesh type used for this geometry is unstructured and the element number is 420485.
CFD Simulation Settings
The key assumptions considered in this project are:
- Simulation is done using pressure-based solver.
- The present simulation and its results are steady.
- The effect of gravity is taken into account and is equal to -9.81 in Y direction.
The applied settings are summarized in the following table.
|Near wall treatment||Standard wall function|
|Total flow rate||0.1kg/s|
|Gauge pressure||0 Pa|
|Walls||wall motion||stationary wall|
|coal wall||DPM boundary condition||trap|
|wall||DPM boundary condition||reflect|
|Spatial discretization||pressure||second order|
|momentum||first order upwind|
|Turbulent kinetic energy||First order upwind|
|Turbulent Dissipation rate||First order upwind|
|Turbulent kinetic energy||0.09375 m2/s2|
|Turbulent Dissipation rate||5.41519 m2/s3|
- Trapper efficiency
The contours of, pressure, velocity, particle tracks, etc. are presented.
All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.