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Modeling two-phase (blood and oxygen) slug flow in a y-junction

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Old   May 13, 2014, 09:42
Default Modeling two-phase (blood and oxygen) slug flow in a y-junction
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Pedro Saynovich
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Hi everyone,

I recently started to learn how to use Fluent, so I am in the beginning of the learning curve.

I want to model a two-phase slug flow of blood and oxygen bubbles in a y-junction (as represented in the picture attached).

I imported a 3D part from SolidWorks, and the y-junction is one of the several tubes in the model. My doubts are:
  • Do I need to model the junction again in the Fluent DesignModeler? After importing the model in Ansys, it is not possible to select all the points, edges and surfaces, and it is hard to define the boundary conditions this way, so I decided to model only one of the y-junctions.
  • What type of mesh should I use? As I am not familiar with the program, I dont know what mesh to use. Also, I think I cannot analyse it with a 2D mesh. Due to the y-junction, the problem is not axysimmetric, so I need a 3D mesh, right?

two-phase-flow-y-junction.jpg

Thank you guys for your time and help.

Regards,
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Old   May 13, 2014, 12:01
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laraib syed
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i have carried out similar simulations. you dont need to make a new geometry in ICEM . just import the one from solid work and clean it and define input and output surfaces.
u can use unstructured mesh tetrahedron . that will give you good results
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Old   May 13, 2014, 15:47
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Pedro Saynovich
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Quote:
Originally Posted by laraib View Post
i have carried out similar simulations. you dont need to make a new geometry in ICEM . just import the one from solid work and clean it and define input and output surfaces.
u can use unstructured mesh tetrahedron . that will give you good results
Hi laraib, thank you for the answer.

What do you mean by clean it? Supress all the faces, but the ones I want to model?

Did you model two-phase flow? I am currently using the VOF model ( I think it is the one more appropriate for two-phase slug flow). Which one do you usually use?
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Old   May 16, 2014, 01:14
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laraib syed
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i am rather curious that why r u using VOF model?? its used for two phase fluid flow. and flow in arteries is not two phase as oxygen is absorbed by the RBCs.
and if u still want to then clean up the geometry by deleting extra surfaces.
like in ur model there is thickness between outer and inner layer which may not be required.
produce a 3d mesh with either tetrahedral or hexagonal elements. u can have a 2d mesh too.
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