ANSYS CFX: Produce swirling flow using cylindrical components
 

Hi, I want to mimic swirling flow into a furnace using cylindrical components in the boundary conditions. I want to specify a mass flowrate followed by the flow direction. The axis of rotation will be specified as two points.

There is no decription in the user guides how the theta component is used. When selecting the cylindrical velocity components the units are for linear velocity, ie m/s etc, which obviously depends on the distance from the axis of rotation, yet there is no description in the user guides of how CFX accounts for this. Can the theta component be specified in terms of an angular velocity, ie radians/s, or as a linear velocity dependent on the distance from the axis of rotation, ie a velocity profile, perhaps using a CEL expression? If so, is there a simpler/more efficient method of describing this than through user Fortran?

Any help would be greatly appreciated.

Thanks,

Neil