AnsweredAssumed Answered

how to set up right boundary conditions to rotating walls

Question asked by James Lee on May 15, 2017
Latest reply on May 16, 2017 by James Lee

Hello, I have to admit that I come from experience of Fluent, and am exploring Flow Simulation to simulate rotating flow for electric machine.

What I am trying to run heat transfer conjugated CFD analysis, it is to simulate an electric machine which will be cool down in the room by natural convection. Please take a look at my attached snapshot for your reference. Here is some basic summary to my settings:


1. internal flow. (I create a large case to put my machine there, thus there will be one surface P1 with pressure in, another surface P2 with pressure out, P1-P1 is a tiny bit....), Rotation is not turned on....


2. the machine's stator will be cooled down by forced convection through channels in its water jacket. thus I set up HTC and its bulk temp through flow simulation Outer wall B.C.


3. rotor assembly will rotate at a high RPM, thus some walls (as I marked out in yellow lines) will rotate. I set up its rotation B.C. through Real Wall B.C. specifying its rotating speed there. --> I am not sure if it is right


4. heat loss to all components, such as stator coppering winding, stator stack, rotor sleeve, rotor magnets, rotor hubs.


I am not sure if I set up all of B.C. all right and I feel like there might be something wrong, but not sure...


Any suggestions?

thank you.