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August 14, 2024 at 12:51 pmSR786Subscriber
Hi,
I want to set up an MRF Case for an unbaffled stirred tank reactor agitated by a magnetic rod stirrer. The tank is unbaffled and open at the top. I have attached an image of the set-up along with the boundary conditions.
For MRF stirrer BC, do I need to define a moving wall for the stirrer in the rotating zone or can I keep it stationary. Also similar question, do I keep the rest of the BC as stationary walls too?
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August 14, 2024 at 2:58 pmSR786Subscriber
For instance here, for the impeller can I keep the BC as a stationary wall or do I need to define the wall as "Moving relative to the adjacent cell zone with 0 RPM". Similarly for the side-walls and bottom can I keep the BC as stationary or do I need to define them as "Moving in the absolute velocity frame with 0 RPM".
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August 14, 2024 at 3:23 pmRobForum Moderator
I can't see images in the second post.Â
The stirrer walls should move at zero rpm relative to the cell zone, which should be rotating at whatever speed you want. Side & bottom can be stationary as their fluid region won't be moving.Â
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August 15, 2024 at 8:58 am
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August 15, 2024 at 9:19 amRobForum Moderator
Correct. What is wall-int ? The mrf should be an interior.Â
As it's an unbaffled tank you could set a single fluid zone with moving walls on the mixer (as you have) and the tank walls as either stationary or moving at absolute rpm of zero.Â
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August 15, 2024 at 10:14 amSR786Subscriber
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I didn’t update the name, it’s meant to be side-wall.Â
The reason why I want to use MRF over SRF is because whilst the current unbaffled mixer is operating in batch, I intend to model precipitation reactions in the mixer which are operated continuously (so inlets and outlets will be added to the model). Due to the addition of these stationary components, MRF would be better than SRF in transitioning from batch mixer to semi-batch/continuous mixer.
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