Different moment between Fluent and CFD post

Falldox · January 27, 2017, 09:54

Hi,

I am running simulations on a rushton turbine at Re=200. In this regime, the Power number should be Po~3.5. Po is calculated from the torque obtained in the simulation. However, when I calculate the torque (moment) on the impeller in fluent, the value is off, resulting in Po~6. When I calculate torque on the impeller in CFD post, I do in fact get the right value, resulting in Po~3.5. Does anyone know what can cause this difference, because I would expect both outcomes to be the same. Any comment would be appreciated.

Thanks

Cledson · July 7, 2021, 11:51

Hi Falldox

I experienced the same problem, getting values in CFD Post of something about 60% of the values in Fluent. After some look I noticed that in Fluent I was evaluating the variable Moment Coefficient and not the variable Moment. After this correction I got similar values.
This could be your case.

January 27, 2017, 09:54	Different moment between Fluent and CFD post	#1
Falldox New Member Robert Join Date: Jan 2017 Posts: 4 Rep Power: 9	Hi, I am running simulations on a rushton turbine at Re=200. In this regime, the Power number should be Po~3.5. Po is calculated from the torque obtained in the simulation. However, when I calculate the torque (moment) on the impeller in fluent, the value is off, resulting in Po~6. When I calculate torque on the impeller in CFD post, I do in fact get the right value, resulting in Po~3.5. Does anyone know what can cause this difference, because I would expect both outcomes to be the same. Any comment would be appreciated. Thanks

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July 7, 2021, 11:51		#2
Cledson New Member Cledson Join Date: Jul 2017 Posts: 2 Rep Power: 0	Hi Falldox I experienced the same problem, getting values in CFD Post of something about 60% of the values in Fluent. After some look I noticed that in Fluent I was evaluating the variable Moment Coefficient and not the variable Moment. After this correction I got similar values. This could be your case.