Tangential velocity
How does fluent calculate the Tangential Velocity? I mean is the SQRT(Vx^2 + Vy^2)? or does it use another way? kind regards, Jan

Re: Tangential velocity
That would give you the magnitude in the X Y plane... assuming that your axis is the Zaxis, this would be the combination of the Radial and Tangential components...
Again, assuming the Zaxis as your axis of rotation, then Tangential would be Vx*cos(theta)Vy*sin(theta) and Radial would be Vx*sin(theta)+Vy*cos(theta). You have to tell Fluent what your reference axis is. This is in the Define>Boundary Conditions... Select the Fluid volume... here you can define the axis origin and direction. The equations will change depending on the location and direction of the axis, so what I gave above is stricly for an axis of rotation coincident with the ZAxis. Hope this helps, and good luck, Jason 
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