CFDEM®coupling

CFDEM®coupling

Functionalities

CFDEM®coupling extends Aspherix® for coupled CFD-DEM simulations and provides a wide range of functionalities for modelling complex fluid-particle processes. No matter if multiphase problems, heat transfer, spray modelling or chemical reactions – CFDEM®coupling can handle all of them.

coupling

Spray Coating in a Spout Fluidized Bed

Coupled CFD-DEM simulation of a spout-fluidized bed. Liquid spray is inserted as passive tracer and deposited on the particles.

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Volume of Fluid (VOF)

Coupled CFD-DEM simulation of a three phase ball mill (water, gas, granular material) with a volume of fluid (VOF) and a DEM solver.

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Euler-Euler DEM

A three-phase fluidized bed comprising liquid, gas and particles is modelled using (Euler-Euler) CFD-DEM method.

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Melting

An extruder is transporting and melting polypropylene granules (particles: white spheres, molten plastic: purple iso-surfaces). The interplay between solid, air and liquid is obtained by coupling Aspherix® with a VoF CFD-DEM solver in CFDEM®coupling. The melting is reproduced by a mass transfer from solid to liquid, which occurs when the particle temperature exceeds the melting point due to external heating.

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Excavation

Size-based Segregation of Pharmaceutical Powders
This is the CFD-DEM simulation of fine, poly-disperse pharamaceutical powder in a closed tube. Size segregation is caused by the counter-current airflow which is induced by the particle stream falling downwards.

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Viscoelastic Flow

This fully four-way coupled CFD-DEM simulation with CFDEM®coupling shows the flow of a viscoelastic fluid and particles through a contraction. The viscoelasticity of the fluid is modelled by the Giesekus equations.

The graph shows the validation against literature (Favero et al.).

viscoelastic
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Immersed Boundary Method (IBM)

The IBM requires a fine resolution of the mesh regions, in which particles are present. Adaptive mesh refinement is carried out for IBM particles – depending on their size. The mesh is refined until a given number of cells per particle is reached.

adaptive mesh refinement

Chemical Reactions

Using coupled CFD-DEM to simulate the methane dehydroaromatization within 3D printed catalysts (symbol image on the right). A 1D-3D model is used for being able to resolve the effects that take place at small scales while representing the entire process (large scales, also time-wise) at the same time. The image shows a snapshot of the benzene concentration within a 3D element. The work is carried out in the frame of the ZEOCAT3D project.

chemical reactions

Spray Coating and Attrition

This application case combines numerous functionalities:

  • Particles are wetted by a spray
  • Particles are heated by convection
  • The heating of the particles causes them to dry
  • Dried spray leads to a coating of the particles
  • At collision, the coating of the particles undergoes attrition
  • Attrition is dispersed in the gas as dust
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Lagrangian Bubble Modelling

Simulation of a plume of rising bubbles (right) and the fluid flow that is induced by the bubbles (arrows on the left). The bubbles coalesce when getting in touch and break up for Weber numbers above a certain threshold.

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Resolved and Unresolved

CFDEM®coupling provides the functionality for handling particles and moving geometry parts using Immersed Boundary Method (IBM). Particles can be modelled as fully “resolved” objects using IBM (right) if the CFD mesh resolution is finer than the particles. In contrast to that, the “unresolved” CFD-DEM handles particles that are finer than the CFD mesh using the Volume Averaged Navier-Stokes Equations.

res_unres
res_unres2

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