MRF Solver fan simulation - problem
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Hi Guys,
Good morning to every one, I am OpenFOAM user, I am working on axial flow fan. To check the OF result, I am trying to simulate the case in Fluent (This is my first case in Fluent for ever). I am using MRF - steady state solver in Fluent, First I tried a passage of a fan (see fig-1 pdf), I got good torque and fluxes but I didnt check the pressure raise. I got good agreement with experimental torque (79 N-m). I thought the simulation is right, now I am not sure about it. Secondly, I tried 2 blade with quarter of the cylinder (see fig-2 pdf), I ran the case with same setup, but the torque is strange I got twice of the passage case (168 N-m). expected torque is 70-80 N-m I am totally confused, please help guys Fluent case setup is as follows: i) Mesh --> check --ok ii) General --> type - Pressure Based, absolute, and time--> Steady iii) Material --> air (I didn’t change the properties) iv) Cell Zone Conditions --> I have 3 zones namely IV - Inlet Volume, FV - Fan Volume and OV - Outlet Volume. here I have selected the Fan Volume --> Frame motion, rotation axis origin - (0 0 0), rotation axis direction (0 0 1), rotational velocity (78.54 rad/s) v) BC's All periodic I have given Rotational (It was Translational) Fan wall motion -->Moving wall motion --> Relative to adjacent Cell Zone and Rotational speed --> 0 rad/s rotation Axis Origin --> (0 0 0) Rotation axis Direction (0 0 1) Is the settings are correct? if not what should I change? please give me some hit, what is going wrong. Thanks for your time and help, Sivakumar |
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