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MRF approach for CSTR

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Old   August 18, 2018, 18:17
Default MRF approach for CSTR
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Jerónimo Guarco
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Hello,

I'm modelling a CSTR (see attached image) through the MRF approach. For this purpose I created a cylindrical volume around the impeller to which I assign an angular speed of 100 rpm. The rest of the reactor is left as static and there are no baffles.

What I'm most concerned about it's the solution I get, which I also uploaded as a picture here. You can observe there is a big change in the velocity profiles from the static and the rotating frames and there is no smooth transition. Is this correct?. When I plot this in "Stn Frame" I get another plot which is what I would expect (also attached).

Another concern of mine are some surfaces and regions (wall-13, wall-14 and interior-8) which I'm not sure what they are. I attached a picture in which I show them in FLUENT. I try to display them and they appear to be nothing. All other surfaces I displayed corresponded correctly. What do you think these are and are they a problem?

Thanks in advance!

Jerónimo
Attached Images
File Type: jpg reactor_geometry.JPG (26.0 KB, 9 views)
File Type: jpg velocity_contours.JPG (57.8 KB, 7 views)
File Type: jpg velocity_in_stn_frame.JPG (53.9 KB, 6 views)
File Type: jpg fluent_surfaces.jpg (92.9 KB, 6 views)
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cstr, mrf, rotating, stirred, stn frame

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