What is the difference between coupling force and total force in EDEM-Fluent coupling (in EDEM analyst)?

Fatemeh Hosseini_22198
Fatemeh Hosseini_22198 Altair Community Member
edited December 2022 in Community Q&A

Hello everybody,
I should compare 2 different simulations (EDEM-Fluent coupling) simulation.
when I plot Coupling force versus time, 2 diagram behave totally different. the trend is same but the numbers are totally different.
and when I plot total force based on the time 2 diagram are approximately similar.
I need to know what is the difference between total force and coupling force exactly.
I insert:
lift, drag, virtual mass, gravity, and pressure gradient as an hydrodynamic force and HM-JKR as a contact force.
Can I say the only difference between these 2 forces in EDEM analyst graph is HM-JKR force?

Regards,
Fatemeh

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Answers

  • RWood
    RWood
    Altair Employee
    edited December 2022

    Hi,

    I can't remember if EDEM's Total Force includes the coupling force (I don't think it does), but the coupling force is the combined lift and drag forces coming from Fluent. I would run a simple simulation to verify this, as well as check if the virtual mass force is included (I don't think it is). If you simulate a particle falling through fluid and not touching a boundary, you should be able to tell easily enough.

    Cheers,

    Richard

  • Fatemeh Hosseini_22198
    Fatemeh Hosseini_22198 Altair Community Member
    edited December 2022

    Thanks for your answer Richard.
    It would be appreciated if you could check it.
    I have deposition and HM-JKR is applied between particles and wall too.
    What will be the difference in this situation?

    Regards,
    Fatemeh

  • RWood
    RWood
    Altair Employee
    edited December 2022
    Fatemeh Hosseini_22198 said:

    Thanks for your answer Richard.
    It would be appreciated if you could check it.
    I have deposition and HM-JKR is applied between particles and wall too.
    What will be the difference in this situation?

    Regards,
    Fatemeh

    As I say, if you run a test simulation of a single particle free falling in fluid, with and without the virtual mass enabled, it should be a simple matter of checking the Total Force and Coupling Force values in EDEM.

    If you want to go a step further you could output the values calculated in Fluent too.

    Richard

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