EDEM coupling with Fluent via DDPM, should or should not select the Granular button in Multiphase panel?

QINGNIAN
QINGNIAN Altair Community Member
edited October 2022 in Community Q&A

Dear Powerful Technical Experts，

When I perform EDEM-FLUENT coupling simulation via DDPM interface, I have a little confusion in the official tutorial, since the DDPM model is activated, should I select "Granular" for the second phase in the multiphase model or not？ While there is no such step in the official tutorial. And the behavior in simulation are completely different via select it or not.


Also, what is the reason behind this? 

(The Eulerian multiphase model in ANSYS FLUENT allows for the modeling of multiple separate, yet interacting phases. The phases can be liquids, gases, or solids in nearly any combination. An Eulerian treatment is used for each phase, in contrast to the Eulerian-Lagrangian treatment that is used for the discrete phase model.

ANSYS FLUENT's Eulerian multiphase model does not distinguish between fluid-fluid and fluid-solid (granular) multiphase flows. A granular flow is simply one that involves at least one phase that has been designated as a granular phase.)

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Best Answer

  • RWood
    RWood
    Altair Employee
    edited October 2022 Answer ✓

    Hi,

    All I can think of is that the EDEM phase that gets automatically created within Fluent has some settings/variables that get overwritten when you enable the granular phase, which is why you see a change in behaviour. You shouldn't need to enable the granular phase - as far as I can recall the coupling is designed to work without that step.

    All the steps in the documentation are either directly from the Ansys developer that wrote the coupling or steps I wrote relating to the compilation tool that I developed. The coupling was developed primarily on the Ansys side, so for a question like this that relates to Fluent 'under the hood', so to speak, you would have to ask Ansys, or if you're feeling up to the challenge check the source code :) 

    Cheers,

    Richard

Answers

  • RWood
    RWood
    Altair Employee
    edited October 2022 Answer ✓

    Hi,

    All I can think of is that the EDEM phase that gets automatically created within Fluent has some settings/variables that get overwritten when you enable the granular phase, which is why you see a change in behaviour. You shouldn't need to enable the granular phase - as far as I can recall the coupling is designed to work without that step.

    All the steps in the documentation are either directly from the Ansys developer that wrote the coupling or steps I wrote relating to the compilation tool that I developed. The coupling was developed primarily on the Ansys side, so for a question like this that relates to Fluent 'under the hood', so to speak, you would have to ask Ansys, or if you're feeling up to the challenge check the source code :) 

    Cheers,

    Richard

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