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July 19, 2016, 10:56 |
Induced flow model-Boundary Conditions
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#1 |
New Member
Alexandros
Join Date: Jun 2016
Posts: 28
Rep Power: 9 |
Hello to everyone,
I'm trying to do a CFX simulation of the airflow through an AFPM electric generator. My model consists of two Rotors (circular disks) each of one having 32 magnets located at their periphery (cuboid boxes) and a Stator in the middle of the Rotors. The Stator is a resin disk which contains 24 coils inside of it. There is a small air-gap (4mm) between each Rotor and the Stator and the Rotors are rotating at about 200RPM. So the air comes in from the front face of the Rotor, moves radially and goes out through the air-gap at the periphery (like a centrifugal fan). What I want to simulate through CFX is the flow that is induced by the rotating discs. The problem is that in contradiction with most of the tutorials that I have come up with, the mass flow at the inlet or outlet is not a known variable for me. So the Boundary conditions that I have set to the model are 0 MPa relative total pressure at the inlet and 0 MPa relative static pressure at the outlet. However, the solver stops with an error message in this case and only if I give a mass flow rate at the inlet or a outlet I can have a non-zero velocity vector at the results. Is there an explanation to this? How can I ask from CFX to compute by itself the velocity vector? Should I change my BCs? P.S.My purpose is to do a CHT analysis, but as a first approach I just want to make sure that my model includes the rotating disks' induced flow, so for the time being, no heat transfer takes place at the setup. Thnx for your time, Alexandros Rontogiannis |
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Tags |
boundary conditions, cfx, induced flow, rotating disks |
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