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Axial fan simulation in UG/NX 7.5

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Old   April 22, 2011, 07:59
Default Axial fan simulation in UG/NX 7.5
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Hi everyone,

For my thesis i have to investigate how well a specific CFD simulation matches reality. The simulation is done with UG/NX 7.5. The problem is the cfd simulation underpredicts the reality quite a lot! I have tried everything to improve the simulation but the simulation never comes close to the reality. So i decided to ask my question here, i hope someone can help me.

So its a simulation of an axial fan (metal sheet blades, 1mm thickness).
The K-epsilon model is used (recommended and it gives the best results).
The fan has a max diameter of 1,2m. The mesh around the fan is unstructured. The mesh size near the blade is 4-6mm, y+ is between 11-200.
To simulate the rotation a rotating frame of reference is used, rotational speed 700 /min.

I hope somene can help me.
Many thanks in advance!
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Old   April 22, 2011, 08:34
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i forgot to say the fan is simulated in a square wind tunnel, 10,5 m long, wich is located in a room, no opening / inlet / outlet BC's are used

Last edited by fan123; April 28, 2011 at 03:18.
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Old   April 23, 2011, 08:22
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How good can CFD normally predict a fan curve?
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