# fan boundary condition and angle of attack

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 February 22, 2022, 05:12 fan boundary condition and angle of attack #1 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, 21:17 #2 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

 August 25, 2022, 06:53 #3 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.

 Tags boundary condition, fan, fluent