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Old   April 17, 2014, 16:29
Default Mixing tank impeller
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Hello. I am trying to model a mixing tank with a single impeller. I am using a rotating reference frame, where I've created a cylindrical rotating fluid around the impeller and defined its rotation.

The problem I'm having is that, when run as steady state, the non-rotating fluid hardly seems affected by the rotating fluid (which in turn doesn't seem affected by the impeller). I've tried different impeller sizes/shapes/blades, but it hardly seems to have an affect on the flow, it mostly just looks like a rotating cylinder of fluid.

In a 1000L mixing tank, I'm seeing very slow velocities away from the rotating fluid zone, 0.01 - 0.10 ft/s, with the rotating fluid moving at 200rpm. I have run the mixing tank in person, and clearly there is more activity irl.

Any thoughts on what I'm missing?

Last edited by Onicon; April 18, 2014 at 11:44.
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Old   March 24, 2015, 02:43
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Nataliia Tatyanko
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Hi, Onicon. I have the same problem as you. Have you decided this problem? I have two parts. One part is a rotating cylinder with emptiness inside in the form of mixer. And the second part is square tank, that surrounds rotating frame.
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fluent, fluid, impeller, mixing, tank

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