What is the mechanism of the EDEM-Fluent coupling interface?

Wei Wang

Hi, I want to learn the mechanism of the EDEM-Fluent coupling 2.3.1 interface. But I find that there are no course to introduce it. How does fluent transfer information to EDEM? What is the message? How does the particle information of EDEM affect the fluid in fluent? Is there a relevant formula?

I would appreciate it if you could help me.

RWood

Hi,

The reason there isn't much in the way of technical detail for the Fluent coupling is because EDEM particles are set up as a Fluent DPM injection. Once the particle data is passed from EDEM to Fluent, drag and buoyancy forces are calculated on the particles in Fluent according to the Fluent theory guide. The only difference is the forces aren't applied in Fluent, but passed back to EDEM to be included in its force calculation. 

There is an eLearning that covers a few technical aspects of the coupling:

https://learn.altair.com/enrol/index.php?id=171

But if there's something not covered in the Fluent theory or that eLearning that you want to know then I can try help out.

Cheers,

Richard

RWood

Hi,

The reason there isn't much in the way of technical detail for the Fluent coupling is because EDEM particles are set up as a Fluent DPM injection. Once the particle data is passed from EDEM to Fluent, drag and buoyancy forces are calculated on the particles in Fluent according to the Fluent theory guide. The only difference is the forces aren't applied in Fluent, but passed back to EDEM to be included in its force calculation. 

There is an eLearning that covers a few technical aspects of the coupling:

https://learn.altair.com/enrol/index.php?id=171

But if there's something not covered in the Fluent theory or that eLearning that you want to know then I can try help out.

Cheers,

Richard

Zilong Qiu

Richard Wood_20774 said:

Hi,

The reason there isn't much in the way of technical detail for the Fluent coupling is because EDEM particles are set up as a Fluent DPM injection. Once the particle data is passed from EDEM to Fluent, drag and buoyancy forces are calculated on the particles in Fluent according to the Fluent theory guide. The only difference is the forces aren't applied in Fluent, but passed back to EDEM to be included in its force calculation. 

There is an eLearning that covers a few technical aspects of the coupling:

https://learn.altair.com/enrol/index.php?id=171

But if there's something not covered in the Fluent theory or that eLearning that you want to know then I can try help out.

Cheers,

Richard

Hey Richard,

 

Thanks for your reply. The e-learning videos are quite helpful to have an overview of the EDEM-FLuent two-way coupling.

I have some specific questions that hope to get your help.

For standard coupling interface, are there only buoyancy force and drag force transferred from the Fluent to EDEM? if we would like to study other forces on particles, e.g., lift force, virtual mass force. Is there any way to apply these forces by making some changes in the coupling interface?

If I am right, the default coupling method should be the DPM method. There is also an option in the coupling panel in Fluent - 'couple with multiphase (DDPM)'. How are the particle volumes treated in the DPM and DDMP? What is the difference of particle volume treatment in the default model and the multiphase model? 

 

I also would like to control the particle injection rate according to the fluid flow rate at the outlet. is this possible realized through the coupling interface?

 

BTW, do we have a manual for the coupling interface (description of each function and parameters)?

 

Best regards,

Zilong

Wei Wang

Zilong Qiu said:

Hey Richard,

 

Thanks for your reply. The e-learning videos are quite helpful to have an overview of the EDEM-FLuent two-way coupling.

I have some specific questions that hope to get your help.

For standard coupling interface, are there only buoyancy force and drag force transferred from the Fluent to EDEM? if we would like to study other forces on particles, e.g., lift force, virtual mass force. Is there any way to apply these forces by making some changes in the coupling interface?

If I am right, the default coupling method should be the DPM method. There is also an option in the coupling panel in Fluent - 'couple with multiphase (DDPM)'. How are the particle volumes treated in the DPM and DDMP? What is the difference of particle volume treatment in the default model and the multiphase model? 

 

I also would like to control the particle injection rate according to the fluid flow rate at the outlet. is this possible realized through the coupling interface?

 

BTW, do we have a manual for the coupling interface (description of each function and parameters)?

 

Best regards,

Zilong

Hi Zilong,

 

Thanks for your replay and questions.

If you installed the EDEM, maybe you can find the manual of the coupling interface (description of each function and parameters) in EDEM/scr/Api/Help. 

Hope it can help you!

 

Cheers,

Wei

Wei Wang

Richard Wood_20774 said:

Hi,

The reason there isn't much in the way of technical detail for the Fluent coupling is because EDEM particles are set up as a Fluent DPM injection. Once the particle data is passed from EDEM to Fluent, drag and buoyancy forces are calculated on the particles in Fluent according to the Fluent theory guide. The only difference is the forces aren't applied in Fluent, but passed back to EDEM to be included in its force calculation. 

There is an eLearning that covers a few technical aspects of the coupling:

https://learn.altair.com/enrol/index.php?id=171

But if there's something not covered in the Fluent theory or that eLearning that you want to know then I can try help out.

Cheers,

Richard

Hi Richard，

 

Thanks for your reply. I have another question that hope you can help me.

In this coupling interface, what information does fluent transfer to EDEM? what information does EDEM transfer to fluent when I used DDPM? Particle volume fraction? Particle velocity?  If I bond the particles, can I also transfer the bonded information or the contact information to fluent?  

I want to identify whether the contact between particles exists in fluent, and then form a fluid channel between particles that do not exist. For example, in the uniaxial compression test, we bond the particles together, and cracks will appear in the sample with the increasing pressure. I want this crack to be reflected in fluent so that the fluid mainly flows along the crack. But the real crack maybe not exist, just the contact do not exist which mean the volume fraction can not be changed. So How can I make the fluid flow along the crack?

If there is anything unclear in the above description, I hope you can point it out.

Looking forward to your reply.

 

Best regards,

Wei