January 6, 2023 at 2:56 pmPatrickodonSubscriber
I want to mix two fluids in a basic cylinder. I've tried doing it through Inventor
where I have 212 mm of water at the top, and 1 mm of milk at the bottom (both with a diameter of 265 mm), with a 20 mm tall gap for a stirrer bar (diameter 52 mm) in the bottom centre (the fluids are arbitrary, they're just both miscible).
I can't get them to mix properly; the Inventor one won't let me create separate bodies, and in DesignModeler, though I am allowed to make two separate bodies by creating a separate drawing for the milk and importing it as a STP file in DesignModeler, I am not allowed to open the Setup:
How should I set this up? I know there's a 2D tutorial for this (_ANSYS Customer Portal_Training Materials_eulerian_multiphase_granular), but I want to go in 3D. Do I need to create a zone where the stirrer bar is that they initially mix in, and how do I do that?
To summarize: I have a cylinder with a bottom 1 mm layer of milk, covered by 212 mm of water. I'm mixing them via a stirrer bar (the "doughnut" for which I've left blank) rotating in the bottom-centre. How do I do this in 3D?
January 6, 2023 at 4:33 pmRobAnsys Employee
Have a look at the mrf examples for mixing tanks. You may, or may not, need a separate zone for the milk, but if you do have mutliple zones read up on share topology too. Note, as milk and water mix it's a species problem, not multiphase. If you also have a head space (air) at the top then you have a multiphase model, with the liquid phase being a species mixture.
January 9, 2023 at 1:46 pmPatrickodonSubscriber
Thanks for the reply. I found this tutorial () which is kind of like what I have, without having two materials mixing (it only has one material), and it's in 2D.
How do I set up 3D mixing for two fluids (I imagine it's to do with setting up multiple zones)? My setup seems very simple, all I want is to be able to mix two fluids (ideally in 3D). I'm surprised I can't find a tutorial on this - I'm checking here (https://www.youtube.com/@AnsysTutor/videos), here (https://www.youtube.com/@AnsysLearning/videos), here (https://www.ansys.com/academic/learning-resources), and here (https://courses.ansys.com/).
January 9, 2023 at 1:53 pmRobAnsys Employee
It's a species model, so have a look at the combustion tutorials: just don't turn on the reactions part! You'd then patch in the second species.
January 9, 2023 at 4:22 pmPatrickodonSubscriber
I'm looking at this
It has mass flow inlet, mass flow air, and an outflow. It's also in 2D (as are the other two I've looked at)
Are there any basic models with mixing, like mine? My one is very simple, I literally just have two fluids mixing in 3D with no input/output (i.e. the fluids start inside the cylinder). Everything else is in 2D and has fluids in/out during mixing.
There may be a mixing tank tutorial somewhere, but I can't see one for single phase on the public side of our system. Typically, we don't have tutorials for every application but use parts of a few where needed. So, 2d to 3d is trivial; use patch rather than an inlet/outlet and review the chemistry to just look at mixing.
There is a webinar https://www.ansys.com/en-gb/resource-center/webinar/mixing-tank-modeling which may be of interest.
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