Multiphase Initial condition for an emulsion

duncan21187 · September 24, 2019, 05:29

Hi OF community!

Hoping for some help with a multiphase case I’m trying to set up of an emulsion of oil/water in a pipe. The intention is to assess where the water will collect once the pipe is in shutdown (i.e no end-end flow) and the emulsion separates.

I was hoping to do this using interFoam, but was wondering if there was a function similar to (or within) setFields that would allow me to randomly distribute the dispersed phase based purely on the phase fraction (10%ish in this case) to give me a realistic initial condition?

Any answers very welcome!

Andrea1984 · September 30, 2019, 03:44

Maybe you could code something using funkySetFields? Try to have a look at this thread: how to initialize a random velocity field with funkySetFields

Not exactly what you are trying to do but it might give you an idea.

Andrea

kcjarvis56 · October 2, 2019, 19:33

Consider using multiphaseInterFoam. I would suggest looking at the tutorials and try to develop a simple case to prove the concept you are trying to achieve. There are other multiphase solver that might also work.

Andrea1984 · October 3, 2019, 08:08

Why using multiphaseInterFoam if you only have to model two phases, i.e. oil and water? I think interFoam should be enough.

One possible issue I see (depending on how finely dispersed your emulsion is) is that you are probably going to need a very fine mesh in order to resolve the interface between the two phases properly in a VoF approach. Maybe a multifluid solver like twoPhaseEulerFoam might be a computationally cheaper option?

Andrea

kcjarvis56 · October 5, 2019, 08:43

Attached is a test case that should get you started in the right direction using multiphaseEulerFoam. I understand it could also be done with a two phase solver also. It will run with v1806.

Sulis · March 22, 2024, 09:33

Quote:

Originally Posted by kcjarvis56

Attached is a test case that should get you started in the right direction using multiphaseEulerFoam. I understand it could also be done with a two phase solver also. It will run with v1806.

Hello, I wonder if this is a case of emulsion? I keep getting errors when running it with v2312.Error message indicating that the file could not be found：constant/phaseProperties

September 24, 2019, 05:29	Multiphase Initial condition for an emulsion	#1
duncan21187 New Member Duncan Weatherhead Join Date: Feb 2012 Location: University of Exeter Posts: 11 Rep Power: 14	Hi OF community! Hoping for some help with a multiphase case I’m trying to set up of an emulsion of oil/water in a pipe. The intention is to assess where the water will collect once the pipe is in shutdown (i.e no end-end flow) and the emulsion separates. I was hoping to do this using interFoam, but was wondering if there was a function similar to (or within) setFields that would allow me to randomly distribute the dispersed phase based purely on the phase fraction (10%ish in this case) to give me a realistic initial condition? Any answers very welcome!

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September 30, 2019, 03:44		#2
Andrea1984 Senior Member Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 179 Rep Power: 16	Maybe you could code something using funkySetFields? Try to have a look at this thread: how to initialize a random velocity field with funkySetFields Not exactly what you are trying to do but it might give you an idea. Andrea

October 2, 2019, 19:33		#3
kcjarvis56 Member Kirk Jarvis Join Date: Mar 2009 Posts: 31 Rep Power: 17	Consider using multiphaseInterFoam. I would suggest looking at the tutorials and try to develop a simple case to prove the concept you are trying to achieve. There are other multiphase solver that might also work.

October 3, 2019, 08:08		#4
Andrea1984 Senior Member Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 179 Rep Power: 16	Why using multiphaseInterFoam if you only have to model two phases, i.e. oil and water? I think interFoam should be enough. One possible issue I see (depending on how finely dispersed your emulsion is) is that you are probably going to need a very fine mesh in order to resolve the interface between the two phases properly in a VoF approach. Maybe a multifluid solver like twoPhaseEulerFoam might be a computationally cheaper option? Andrea