3.2.1 Axisymmetric Considerations for Data Access Macros

C-side calculations for axisymmetric models in ANSYS FLUENT are made on a $1$ radian basis. Therefore, when you are utilizing certain data access macros (e.g., F_AREA or F_FLUX) for axisymmetric flows, your UDF will need to multiply the result by 2*PI (utilizing the macro M_PI) to get the desired value.