December 17, 2018 at 1:51 pmBillTSubscriber
I am trying to model a flow of 2 liquids (both water) through a channel filled with air. I want them to spread in different directions (see below), which I tried by defining different momentum source terms. In my simulation the two water phases always mix up and flow downwards only. I set up the eulerian multiphase model with 3 eulerian phases (air, water1, water2). At my inlet I set the volume fractions of both water phases to 0.5 and the same velocity. Do I have to set any phase interactions I forgot or use the discrete phase model to get a result as shown below?
Thank you in advance!
December 17, 2018 at 3:03 pmRobAnsys Employee
If the two water phases are supposed to mix you need two phases with the liquid phase comprising two species. What would cause the two water materials to flow in different directions in reality?
December 17, 2018 at 6:36 pmBillTSubscriber
I want to model the flow over two inclined plates in structured packings with porous media. Therefore I need to model two separate liquid phases. My primary phase is air and I have defined two secondary phases with water. The liquid phases are not supposed to mix. What exactly do you mean that I need two phases with the liquid phase comprising two species?
December 17, 2018 at 6:53 pmDrAmineAnsys Employee
The picture is from which reference? I will go for just two-phase system wit only one water phase.
Even if it does not make sense for me:
If both phases of water are having the same density or do not have a pressyre jump due surface tension they will not be sparated (perhaps via sorce terms)
December 17, 2018 at 9:30 pmBillTSubscriber
The picture is from phd thesis from Soulaine. He modeled this behaviour in openfoam. Basically, I try to model this:
Title: Gas-liquid flow modeling in columns equipped with structured packing
Any suggestions how to model this behaviour in fluent?
December 18, 2018 at 11:13 amRobAnsys Employee
I don't think you need species, they're modelling how liquid behaves as it pours over the packing. This is going to need a huge amount of mesh, and can't work in 2d unless you leave gaps for the liquid to drop down the system & gas to rise. From quickly reading the public access document I think the source terms are referring to the bulk model, not the plates?
Multiphase modelling requires a very detailed understanding of the flow physics before you go anywhere near CFD software: so to aid we need to understand the purpose of the model. We will also struggle given the limitations we're working to within the Community. Please can you outline what you're wanting to find out, and we'll take it from there?
- You must be logged in to reply to this topic.
Simulation World 2022
Earth Rescue – An Ansys Online Series
- Suppress Fluent to open with GUI while performing in journal file
- Heat transfer coefficient
- What are the differences between CFX and Fluent?
- Floating point exception in Fluent
- Time Step Size and Courant Number
- Difference between K-epsilon and K-omega Turbulence Model
- The solver failed with a non-zero exit code of : 2
- Floating point exception
- Exporting Data Results