Learning Forum

[Shyam Prasad V Atri]

Hello

I have a problem where i am trying to simulate how water flows around a particle using Rcky-Fluent coupling with the VOF method

I don't understand how to set up the bidirectional coupling for this. Can anyone please guide me through achieving this with fluent/rocky coupling?

[Rob]

You may want to do some reading on how Rocky passes data into Fluent and how Fluent handles it. It's in the coupling manual. 

[Shyam Prasad V Atri]

I have seen rocky manual there is no example of such kind given in rocky manual.

Tutorial 23 explains the coupling. That's it. can you please tell me if there are any examples of such kind in the manual. I could not find any good examples 

[Shyam Prasad V Atri]

I see in coupling limitation that multifluid VOF model is not supported in rocky. does it mean that rocky does not support more than two fluid model in VOF? or it does not support two fluid VOF model in 2way coupling too?

When I look at the verification manual I see only three problems outlined which does not have any example of multiphase model coupling for rocky-fluent.

In the tutorials section, tutorial 14 explains about setting up two-way coupling for a fluidized bed and tutorial 16 for mixing tank

are you trying to say that to achieve the above problem I should follow tutorial 14 or 16 and forget about VOF? Please let me know

 

[Rob]

Look at the size of the particle relative to the domain. How will Rocky pass that data back to Fluent?

[Shyam Prasad V Atri]

The size you see in the image is just a reference I created in PowerPoint. Size is not a problem. I don't know if I can achieve such a simulation. Please tell me about feasibility using vof (air,water). 

[Rob]

You can have two phases in Fluent (eg gas & liquid) using Eulerian multiphase and then track particles in Rocky. But as the particles are small you won't see flow "around" them as would might if you included a physical shape in the geometry.  

Some information about what you're actually modelling may help. 

[Shyam Prasad V Atri]

I want to do this with vof preferably as I am also interested in contact angle. Can you please tell me if I can do it with vof?

[Shyam Prasad V Atri]

I want to deposit some water on a particle see how much water gets deposited and evaporate it later (I want to do it with Rocky coupling preferably) if it's not feasible to do it there..can this be achieved in fluent only?

[Rob]

So droplets that are small relative to the particle? But you want them to remain as droplets rather than form a film?

[Shyam Prasad V Atri]

Yes.... I want to see how much droplets remain as the water exits downstream.. then evaporate the remaining droplets.

[Rob]

I think you need to read up on VOF, DPM, wall films and multiphase in general for Fluent. I'm still not entirely sure what you're trying to do, but don't yet see any Rocky connections. 

[Shyam Prasad V Atri]

Simulation that i am trying to attempt has no physical significance or anything else. i am trying to see if this is capable of being done through coupling or not. 

I have two problems

1) couple fluent vof with rocky (air,water)

2) apply evaporation through coupling. (I see in the limitations of coupling that this is not possible). Is this going to be added in the future version?

I want to give contact angle and see how the fluid interface travels around the particle first and then later see how the particle moves with the fluid

[Rob]

Fluent and Rocky couple using the Eulerian multiphase model, and particles are small relative to the mesh. Please do the reading I suggested.