Particle Shape Combination

Johnson

Please, I want to ask what are the different particel shape combinations or bondings that are possible with EDEM version 2025. I have some list below; please let me know which ones are possible and any other particle shape combination that is not on the list.

• Spherocylinder and sphere 
• Spherocylinder and spherocylinder
• Polyhedral and polyhedral
• Spherocylinder and polyhedral 
• Sphere and polyhedral

Thank you.

 

Stephen Cole

Hi

The Linear Elastic Bond Model is the only model which allows you to bond polyhedral particles. Sphero-cylinders and spheres are considered almost the same within the solver so any model which works for spheres typically works for sphero-cylinders. Compatibility is:

LEBM

Spheres-Sphere

Spheres-Polyhedral

Spheres-Sphero-Cylinders

Polyhedral-Polyhedral

Polyhedral-Sphero-Cylinder

Sphero-Cylinder-Sphero-Cylinder

Bonding V2 is technically written for single sphere particles only however it is widely used for multi-sphere and sphero-cylinder particles. Fibers bonding is technically written for Sphero-Cylinders but it works for spheres as they are short sphero-cylinders.

Fibers Bonding and Bonding V2

Spheres-Sphere

Spheres-Sphero-Cylinders

Sphero-Cylinder-Sphero-Cylinder

EDEM 2025 has the addition of 'contact radius' to polyhedral particles and also in the API the ability to specify if a contact exists or not (even if the particles are not physically in contact). This does mean fibers bonding and bonding V2 both could be modified to allow for bonding with polyhedral, just the work has not been done. The code for fibers bonding isn't available however the code for Bonding V2 could be:

https://community.altair.com/discussion/35365/edem-api-contact-model-example-updated-bond-model-example-of-customisation-of-bond-model

Edit - Some further feedback from the product team that it's best to use polyhedral particles and spheres of a similar size if bonding them together. Or to note that if the polyhedral are large the bond stiffness could be larger than expected.

Stephen Cole

Hi

The Linear Elastic Bond Model is the only model which allows you to bond polyhedral particles. Sphero-cylinders and spheres are considered almost the same within the solver so any model which works for spheres typically works for sphero-cylinders. Compatibility is:

LEBM

Spheres-Sphere

Spheres-Polyhedral

Spheres-Sphero-Cylinders

Polyhedral-Polyhedral

Polyhedral-Sphero-Cylinder

Sphero-Cylinder-Sphero-Cylinder

Bonding V2 is technically written for single sphere particles only however it is widely used for multi-sphere and sphero-cylinder particles. Fibers bonding is technically written for Sphero-Cylinders but it works for spheres as they are short sphero-cylinders.

Fibers Bonding and Bonding V2

Spheres-Sphere

Spheres-Sphero-Cylinders

Sphero-Cylinder-Sphero-Cylinder

EDEM 2025 has the addition of 'contact radius' to polyhedral particles and also in the API the ability to specify if a contact exists or not (even if the particles are not physically in contact). This does mean fibers bonding and bonding V2 both could be modified to allow for bonding with polyhedral, just the work has not been done. The code for fibers bonding isn't available however the code for Bonding V2 could be:

https://community.altair.com/discussion/35365/edem-api-contact-model-example-updated-bond-model-example-of-customisation-of-bond-model

Edit - Some further feedback from the product team that it's best to use polyhedral particles and spheres of a similar size if bonding them together. Or to note that if the polyhedral are large the bond stiffness could be larger than expected.

Johnson

thank you for your response