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Fan modelling with PQ characteristics

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Old   February 18, 2021, 06:59
Default Fan modelling with PQ characteristics
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Gokulakrishnan Seethapathy
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Hello Everyone,

I am trying to model a simple case with fan using MRF zone and PQ characteristics. Please refer to the attached images for understanding the domain. I have created fan volume as cellzone and made this cell zone as MRF region. I believe swirl conditions are given in MRF zone properties. Am I right?

I have created zero thickness boundary at fan inlet and assigned 'fanPressureJump' BC for pressure and 'cyclic' BC for other variables. In this way, I thought I can apply PQ characteristics for the fan. Am I right?

Pressure and velocity both are unknown at inlet and outlet. I have used the following BCs for inlet and outlet,
Inlet:
p = Total pressure (Value = 0)
v = PressureInletOutletVelocity

Outlet:
p = fixed value (Value = 0)
v = PressureInletOutletVelocity

When I ran the simulation, the flow come in through 'outlet' and exit through 'inlets'. But I want it to be other way. looks like there is some problem with BCs.

Please let me know what BCs are appropriate in this case. I have also attached my case here for reference.
Attached Images
File Type: jpg domain.jpg (27.4 KB, 15 views)
File Type: png Cut_away_domain.png (96.2 KB, 15 views)
File Type: png pressure_contour.png (57.4 KB, 13 views)
File Type: png U_vector.png (164.2 KB, 9 views)
File Type: jpg velocity_Contour.jpg (17.0 KB, 7 views)
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