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Simulation of two phase flow inside a bi-fluidic oscillator

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Old   May 7, 2020, 02:42
Default Simulation of two phase flow inside a bi-fluidic oscillator
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Divy Desh
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Hi,
I want to simulate a two phase flow using two fluids inside a fluidic oscillator in ANSYS FLUENT. I've chosen a feedback free fluidic oscillator with 2 inlets, one for each fluid. I'm using Multiphase VOF model with surface tension interaction between fluids. But I'm not sure about the turbulence model and the boundary conditions that I should use for the flow.
I've also attached the mesh pic of the model. If the meshing is inappropriate, kindly give suggestions to correct it.
I'm a beginner on ANSYS fluent, so any kind of help will be appreciated.
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Old   May 7, 2020, 09:23
Default Turbulence and the Domain
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It appears that you are using 2D planar. Do note that 2D planar implies that the domain can be extruded in its normal direction to generate actual 3D model. In other words, actual model is assumed to be cylindrical with its axis perpendicular to the screen and the inlet and outlet are rectangular surfaces. If that is not the case, you will have to use 3D mode since your model cannot be represented by 3D.

As far as turbulence model is concerned, that depends on the objective. If the objective is to study the mixing, then you can use k-\varepsilon. The mesh is good but may or may not be fine enough depends upon the domain size and flow rates.
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Old   May 7, 2020, 14:39
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Thanks @vinerm for your suggestions. Yes, it is a 2D planar model as I've taken the reference model from a research paper which used 2D analysis for simulation. My main objective is to simulate the flow showing the dome and the side vortex forming inside the domains and analyze the oscillation frequency over different flow rates.
Actually, the problem I'm facing is most of the research papers I've found use only 1 fluid but I'm unable to find a paper using two or multiple fluids in a fluidic oscillator, so I'm not sure how to proceed.
Still, I'll try going by your suggestions.

Thanks again

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Old   May 7, 2020, 15:04
Default Multiphase Model
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You can use VOF model and there are multiple tutorials online that show how to setup a VOF model. For one inlet, you have to set volume fraction of secondary phase as 0 and for the other inlet volume fraction as 1. In VOF, it does not matter which phase is secondary; it could either be oil or water. Outlet would be pressure outlet.
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Old   May 8, 2020, 14:48
Default Meshing
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How to get this kind of meshing or close to this meshing? Do I have to use inflation at the boundary walls?
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Old   May 8, 2020, 14:53
Default Structured Mesh
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This is structured mesh. You will have to use a tool that can do that, i.e., ICEMCFD. If you do not know how to use that tool and want to use Ansys Meshing then you can still get closer by decomposing the body into multiple bodies of cylindrical topology.
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