{"id":44252,"date":"2020-05-21T15:36:05","date_gmt":"2020-05-21T15:36:05","guid":{"rendered":"\/forum\/forums\/topic\/should-fluid-be-rotating-or-wall-be-rotating\/"},"modified":"2020-05-21T15:36:05","modified_gmt":"2020-05-21T15:36:05","slug":"should-fluid-be-rotating-or-wall-be-rotating","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/should-fluid-be-rotating-or-wall-be-rotating\/","title":{"rendered":"Should fluid be rotating or wall be rotating"},"content":{"rendered":"

I am solving the problem in the FLUENT tutorial “Using a Single Rotating Reference Frame” to check some doubts I have. I got different results if I set the “frame motion” of “fluid zone” to be rotational as in the tutorial, OR if I set the wall boundary condition to be rotational. I use the rotational speed 400 rpm instead of the value in the tutorial to see the difference.<\/p>\n

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In the case of setting up the “frame motion” of “fluid zone” to be 400 rpm, the pressure is from -25.9 pa to 4.7 pa (left). However, in the case of setting up the rotational wall boundary condition to be 400 rpm, the pressure is from -15.1 pa to 4.6 pa (right). I put the two pressure contour plots side by side with the same color map as a comparison.<\/p>\n

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For the velocity, the velocity magnitude in the core area from “frame motion of fluid zone” (left) is larger than that from “rotational wall boundary condition” (right), although the maximal velocities are the same.<\/p>\n

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Can anyone tell me why I got different results? And which setting would be the correct one? In my opinion, the wall is the rotating body in the physics world. So the results by setting up the rotational wall boundary condition should make more sense, right?<\/p>\n

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Thank you very much!<\/p>\n

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