# Rotation Axis in Fluent

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 February 20, 2011, 12:21 Rotation Axis in Fluent #1 New Member   Join Date: Oct 2010 Posts: 19 Rep Power: 15 Hi, I created a 3D mesh in fluent, a duct that needs to be rotationally periodic to create a 360 degree passage (centrifugal compressor). I found the rotation axis in Pointwise from point coordinates, and I entered those in the fluent cell zones, but I keep getting the errors '0 faces out of 9801 matched'. I know my mesh is correct because I've successfully made it periodic in fluent before (the mesh was just rotated and translated in space). Does Fluent change the location of the mesh in Pointwise ? Can I find the rotation axis of my mesh directly in Fluent ? What else could be causing this error ? I am getting really desperate, any help very much appreciated... Thank you !!

 February 21, 2011, 18:22 you need enter on boundary conditions #2 New Member   Carlos Alfonso Juárez Navarro Join Date: Feb 2011 Posts: 3 Rep Power: 15 Hi, In Fluent you need put the rotacional velocity in the boundary conditions Define/Boundary Conditions/Fluid/Set/ On "Rotation-Axis Direction" put "1" on the axis wich corresponds the turn... if you turbomachinery turns in "X" put "1" in "X" The axis direction respond with the "right hand law" In motion type put "Moving Reference Frame" On "Rotacional Velocity" put the rotational velocity...

 February 21, 2011, 18:24 #3 New Member   Join Date: Oct 2010 Posts: 19 Rep Power: 15 Thanks but my geometry isn't rotating, I'm just essentially modeling a pie-shaped wedge, which if repeated periodically should give me a 360 degree channel geometry (but the rotation speed is 0)

 November 8, 2016, 21:44 Rotation-Axis Direction #4 Member   Abdulaziz Abutunis Join Date: Aug 2014 Posts: 43 Rep Power: 11 Hi All, I have the same question. If there is no rotation, what should I put under the Rotation-Axis Direction. The default is (x=0, y=0, and z=1). Should I set zero for all since no rotation? Best Aziz

 Tags axis, fluent, mesh, periodic, rotation