fan boundary condition and angle of attack

fd_flux · February 22, 2022, 06:12

I am using the boundary condition fan in fluent 2020 R1 to analyze the rotation of the fan immersed in a current at angle of attack alpha 4, in fact the input speed has the components vx = v * cos (4) and vz = v * sin (4) since the reference system is such that the x axis is coincident with the axis of rotation of the fan, z upwards and ya left, as can be seen from the draft.
I want the fan rotation axis to be in the x direction and in the fluid panel I set (1,0,0) for rotation axis direction and (0,0,0) for origin. I still don't understand why the contour produces a different tangential velocity profile than what I expect. Is it influenced by the angle of attack? how can I solve this problem?

Cattura.JPG

AlexanderZ · February 22, 2022, 22:17

actual problem description is not clear

ritikg99@outlook.com · August 25, 2022, 07:53

You can try rotating the surface for fan boundary condition to the desired angle of attack while keeping the inlet condition at 0 deg AoA.

February 22, 2022, 06:12	fan boundary condition and angle of attack	#1
fd_flux New Member Caserta Join Date: Feb 2022 Posts: 5 Rep Power: 4	I am using the boundary condition fan in fluent 2020 R1 to analyze the rotation of the fan immersed in a current at angle of attack alpha 4, in fact the input speed has the components vx = v * cos (4) and vz = v * sin (4) since the reference system is such that the x axis is coincident with the axis of rotation of the fan, z upwards and ya left, as can be seen from the draft. I want the fan rotation axis to be in the x direction and in the fluid panel I set (1,0,0) for rotation axis direction and (0,0,0) for origin. I still don't understand why the contour produces a different tangential velocity profile than what I expect. Is it influenced by the angle of attack? how can I solve this problem? Cattura.JPG

February 22, 2022, 22:17		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	actual problem description is not clear __________________ best regards ****************************** press LIKE if this message was helpful

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August 25, 2022, 07:53		#3
ritikg99@outlook.com New Member Ritik Gupta Join Date: Aug 2022 Posts: 1 Rep Power: 0	You can try rotating the surface for fan boundary condition to the desired angle of attack while keeping the inlet condition at 0 deg AoA.