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

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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RWood

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

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

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