Discrete Phase Flow Trap (Trapper) by Gravity CFD Simulation, ANSYS Fluent

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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.

Project Description

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.

trap trap

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.

Viscous model k-epsilon
Model realizable
Near wall treatment Standard wall function
Discrete phase on
Injection Type surface
Release from inlet
Particle type inert
Diameter 0.1 mm
Velocity 5m/s
Total flow rate 0.1kg/s
Boundary conditions
Inlet Velocity magnitude
Velocity 5 m/s
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls wall motion stationary wall
coal wall DPM boundary condition trap
wall DPM boundary condition reflect
Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure second order
momentum first order upwind
Turbulent kinetic energy First order upwind
Turbulent Dissipation rate First order upwind
Initialization method   standard
Gauge pressure  Pa
Velocity(x,y,z) (-5,0,0)m/s
Turbulent kinetic energy 0.09375 m2/s2
Turbulent Dissipation rate 5.41519 m2/s3


  • Trapper efficiency

trap Mr CFD

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.


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