Axial Fan is rotating - BC's at Inlet/Outlet?

SirIsaac90 · August 9, 2016, 06:14

Hello Foamers,

I am struggling.. I have not found a satisfying solution
I have an axial fan inside a domain. The Inlet and Outlet have some different dimensions.
The fan has a specific rotational speed.
It is simulated compressible with rhoSimpleFoam and MRF.

I saw some threads, where it was written that:
p-->
inlet: totalPressure
outlet: fixedValue

But I can not believe that. If I know the pressure in the atmosphere, let's say: 101325 Pa.
At the Outlet, the static pressure should decrease.

So, I would say
p-->
inlet: totalPressure
outlet: totalPressure

Both totalPressure with p_tot = 101325 Pa, correct? Can anybody tell me whether this is the correct way to do it?
Then, this would lead to a static pressure which is less than 101325 Pa (depending on the velocity value).

Thank you!

Regards
JW

jumaah · September 8, 2016, 14:17

hi, try this video
https://www.youtube.com/watch?v=KFrZoDWUC5s
I hope it will help.
Jumaah

August 9, 2016, 06:14	Axial Fan is rotating - BC's at Inlet/Outlet?	#1
SirIsaac90 New Member Justin Wiegmann Join Date: Aug 2015 Posts: 20 Rep Power: 12	Hello Foamers, I am struggling.. I have not found a satisfying solution I have an axial fan inside a domain. The Inlet and Outlet have some different dimensions. The fan has a specific rotational speed. It is simulated compressible with rhoSimpleFoam and MRF. I saw some threads, where it was written that: p--> inlet: totalPressure outlet: fixedValue But I can not believe that. If I know the pressure in the atmosphere, let's say: 101325 Pa. At the Outlet, the static pressure should decrease. So, I would say p--> inlet: totalPressure outlet: totalPressure Both totalPressure with p_tot = 101325 Pa, correct? Can anybody tell me whether this is the correct way to do it? Then, this would lead to a static pressure which is less than 101325 Pa (depending on the velocity value). Thank you! Regards JW

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September 8, 2016, 14:17		#2
jumaah Member Omar jumaah Join Date: Jan 2016 Posts: 36 Rep Power: 11	hi, try this video https://www.youtube.com/watch?v=KFrZoDWUC5s I hope it will help. Jumaah