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ACMI rotating zone: which frame is used for fixedValue, noSlip, movingWallVelocity? |
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September 2, 2020, 03:13 |
ACMI rotating zone: which frame is used for fixedValue, noSlip, movingWallVelocity?
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Tobias Kienzler
Join Date: Mar 2020
Posts: 13
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I'm simulating a pump with its stator and rotor separated by an cyclicACMI. The rotor mesh is rotating (no MRF). Since the gap is very narrow at some points, I want them to be non-overlapping parts using ACMI's neighbourPatches. Now my question, which boundary conditions should I use where? The stator's walls are fixed and the rotor's ones rotating, obviously.
$FOAM_TUTORIALS/incompressible/pimpleFoam/RAS/oscillatingInletACMI2D (the only cyclicACMI tutorial case I could actually find) declares the blockage as type wall; in blockMeshDict, which makes sense either way. But in 0/U the blockage uses a noSlip condition, whereas all other non-interface walls have a movingWallVelocity of 0. The user guide on that states Quote:
But what about the stator's blockage? That should be a moving wall of the rotor, not a stationary one. And while the rotor zone does rotate I wonder how to state "noSlip, but in the rotating mesh's frame". The boundary condition guide doesn't mention it, but deeper down in the API documentation I found rotatingWallVelocity while writing this post, is that the proper condition to select then? That's what I'm going to try now anyway, but of course I'd appreciate input from anyone who already did something along this line. |
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acmi, movingwallvelocity, noslip, reference frame, rotating mesh |
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