Learning Forum

[Vicky]

Dear Sirs,

I am doing a pneumatic conveying simulation, using 2-way coupling between Fluent and Rocky. I am reviewing the manual for turbulence modulation, so I am using the option "k - ε Dispersed Turbulence Model", which has the following options:

When configuring my simulation between both software, I check the option that Fluent gives me but I only find the following: "dpm-averaged"

 

 

So what do you mean by "dpm-averaged"? And how could I get information from the equations that Fluent is using to calculate the 2 source terms?

Which option is the most appropriate for pneumatic conveying? (Simonin et al.; Troshko-Hassan or Sato), I had already read that the Troshko-Hassan option is more appropriate for boiling flows.

Thank you.

[Rob]

I probably need to run another coupled model to test - I did a lot of co-simulation but haven't needed to recently. Rocky does all the particle work, and takes the flow data from Fluent. Rocky then returns a drag and volume fraction to Fluent so the flow field can be updated. If you look in the Rocky manuals (in Help) there's a section on coupling to Fluent - hopefully it's explained there. 

I'll leave a message for a counterpart on the Rocky team (I use it to extend Fluent's capabilities, he then covers the more complex Rocky side of things) for when he wakes up. 

[Vicky]

Hello Rob,

Thank you for your answer. Yes, I reviewed Rocky's manual but he only described the three options that Fluent proposes, that is to say (per-phase, dispersed and mixture, but they do not add more information about the equations that Fluent is using to calculate the 2 source terms.

Thank you for leaving a message for Rocky's team. I will be attentive to any answer they can provide.

 

 

[Rob]

They don't make a great deal of sense at this time in the morning: they've not had breakfast yet! ;)

Rocky takes the Fluent flow, temperature etc over and works the particle motion out. That's then passed back to Fluent. Those interactions shouldn't be needed. 

DPM-averaged is only mentioned for DDPM. Double check you've not turned it on by mistake: Rocky does all of the particle tracking for you but needs the dummy phase in Fluent to hold the data.