Aspherix®

ASPHERIX®

DEM Models

Aspherix® offers a wide range of models for the accurate representation of bulk materials and the processes that they are used in. While some of them are required to depict the physics correctly, others such as coarsegraining and load balancing serve the purpose of increasing the computational efficiency.

aspherix

6-DOF Geometry Motion

The geometry of the rigid body is imported as a surface mesh from an STL file. Mass, center of mass and moments of inertia are specified in the according mesh module. External forces,including particle-wall forces determine the geometry motion.

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6-DOF plate motion
This video shows the motion of a plate around a central hinge. The body rotation is determined by the particle-wall forces and by an external torque that acts in opposition to the rotation around the hinge.

Heattransfer

Description

Effect of segregation on heat transfer (link).

Top: constant temperature of 300 K

adiabatic walls

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Bottom: constant temperature of 800 K

segragation_image1

Cohesive Mixing

Mixing simulation of cohesive (right) and non-cohesive (left) material. In this project we investigated the mixing efficiency of the geometry, the change of the mixing efficiency for different materials (see graph in video), the residence time distribution and design questions of the mixer geometry.

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Wear

The animation shows the deformation of the mesh caused by wear. The Finnie wear model was used to predict the deformations.

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Powder compaction

Description
Real convex shapes without inward facing components can be imported easily from 3D CAD files.

CATEGORY
Complex shapes
COMBINED WITH
SPH, FEA, MBD, Wear
C++ API
Yes

Soil Models

Calibration of compacted soil with a moisture of 13% using the vane shear test. The approach is based on literature (Karmakar & Kushwaha, 2007).

soil1
soil2
soil3
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Rheology Models

Aspherix® can simulate materials with rheological models to match storage and loss modulus in oscillatory rheometer tests.

rheo1
rheo2
rheo3

Unresolved Breakage

  • Improved model version: elastic energy is disspated
  • Improved comparison of trajectories
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  • Improved model version: elastic energy is disspated
  • Improved comparison of trajectories
  • Center of mass for particles nearly indentical

6-DOF Geometry Motion

The geometry of the rigid body is imported as a surface mesh from an STL file. Mass, center of mass and moments of inertia are specified in the according mesh module. External forces,including particle-wall forces determine the geometry motion.

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6-DOF plate motion
This video shows the motion of a plate around a central hinge. The body rotation is determined by the particle-wall forces and by an external torque that acts in opposition to the rotation around the hinge.

Particle Insertion

The new insertion command

  • … can insert more (elongated) particles within a region in new packing generator mode batch
  • … requires less mandatory keywords
  • … accepts the definition of insertion shapes without meshes

 

The new packing generator introduces the following functionalities:

  • Insertion of particles across processor boundaries
  • Creation of identical insertions for any processor count  or layout
insertion

Load-balancing

Description
Real convex shapes without inward facing components can be imported easily from 3D CAD files.

CATEGORY
Complex shapes
COMBINED WITH
SPH, FEA, MBD, Wear
C++ API
Yes

Coarsegraining

In coarsegraining we represent groups of particles by single, larger particles while at the same time we maintain the original properties of the bulk material. This requires scaling laws.

In the animation we are comparing the original simulation (3700 particles) to two cases with less, larger particles (462). In the “enlarged” case we simply use larger particles with the same material properties as the original material, in the “coarse-grained” case we apply the required scaling laws.

A comparison of the wear on the chute shows that the results for the original and the coarsegrained case match while the “enlarged” case shows strong deviations.

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Defeaturing

Description

  • Industrial applications heavily uses meshes 
  • Handling of meshes of mediocre quality is crucial for industrial applications
  • We added an algorithm for automatic removal of small features
 

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