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Old   December 23, 2004, 23:53
Default Mixing Plane
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Ellen
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hi, all;

My project is about airconditioning outdoor unit modeling which include a propeller fan . I want to use mixing plane model. Since our target is to calculate CFM , which boundary condition should I use for downstream, Mass flow inlet or pressure inlet?

If I use mass flow inlet , then How to specify the average mass flux for mass flow inlet?

thanks for attention
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Old   December 26, 2004, 12:26
Default Re: Mixing Plane
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emre
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Hi,

If youre going to model the whole AC unit, model the fan as lumped, by specifying its P-V curve if you know it. If you just have the geometry but no curve, then model it with MRF not MPM. Use pressure inlet and pressure outlet BCs.

Regards, Emre
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Old   December 27, 2004, 23:28
Default Re: Mixing Plane
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Ellen
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Hi,Emre:

Thanks for your kindly help!

In fact, I only have used the MRF with pressure inlet/outlet boundary condition. The reason I want to use Mixing plane is to see whether the results can be improved. Could you elaborate on why I can't choose MPM if fan curve is unknown.

Regards,

Ellen
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Old   December 28, 2004, 04:04
Default Re: Mixing Plane
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emre
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Hi Ellen,

In order to improve your results you could use sliding mesh model, which is computationally more expensive since you have to solve unsteady flow. I have seen applications of MPM only for rotor-stator interactions.

Best Regards,

Emre
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