Simulating Fan

nkjsimulating · October 18, 2013, 04:59

Hello teammates,

I am struggling with setting of bcs for axial fan. The methodology used is MRF for rotating part and stationary zone for remaing cell zones.

General setup - Absolute Velocity formulation

Cell Zone conditions-
rotating zone - MRF /5000 rpm/ (Relative to cell zone- absolute)
stationary zone - 0 rpm /(Relative to cell zone- absolute)

BC
inlet - pressure inlet / default conditions
outlet - pressure outlet / default conditions

After 5000 iterations if I see the the pressure contour the range observed is -2.664 - +2.66 atm ...and velocity (0 - 693.19 m/s )...

Is it correct ? any suggestions are welcome..

triple_r · October 18, 2013, 14:08

I would suggest asking this in the FLUENT forum, and you should get much better answers (probably you need to provide a bit more information).

However, if the velocity you are reporting is with respect to a stationary frame of reference, then you can check it with the fan tip speed (fan radius * fan rotational velocity) to see if it is in the ball park.

For the pressure range, what is the driving pressure difference?

October 18, 2013, 04:59	Simulating Fan	#1
nkjsimulating New Member Niraj Join Date: Jul 2013 Location: Germany Posts: 15 Rep Power: 13	Hello teammates, I am struggling with setting of bcs for axial fan. The methodology used is MRF for rotating part and stationary zone for remaing cell zones. General setup - Absolute Velocity formulation Cell Zone conditions- rotating zone - MRF /5000 rpm/ (Relative to cell zone- absolute) stationary zone - 0 rpm /(Relative to cell zone- absolute) BC inlet - pressure inlet / default conditions outlet - pressure outlet / default conditions After 5000 iterations if I see the the pressure contour the range observed is -2.664 - +2.66 atm ...and velocity (0 - 693.19 m/s )... Is it correct ? any suggestions are welcome..

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October 18, 2013, 14:08		#2
triple_r Senior Member Reza Join Date: Mar 2009 Location: Appleton, WI Posts: 116 Rep Power: 17	I would suggest asking this in the FLUENT forum, and you should get much better answers (probably you need to provide a bit more information). However, if the velocity you are reporting is with respect to a stationary frame of reference, then you can check it with the fan tip speed (fan radius * fan rotational velocity) to see if it is in the ball park. For the pressure range, what is the driving pressure difference?