[lef47671]

Hi guys,


i am wondering how fluent calculates the surface area of a inlet surface in a 2d axisymmetric simulation.
I try to simulate the flow of two gases (air and methane) through a combustor in a combustion chamber. A drawing of the geometry is attached.
In my opinion the real surface area of "Inlet 1" is S1 = pi*R1^2 = 28.27 mm2 since the line of "Inlet 1" with the length of R1 leads to a circular surface. BUT Fluent says the surface area of "Inlet 1" is 405.27mm2 (im reporting the surface area of "inlet 1" in the calculation.
The real surface area of "Inlet 2" should be S2 = pi*R3^2 - pi*R2^2 = 480.66mm2 since this is a annular surface. But Fluent says the surface area is 1611,6 mm2...

Does anybody know how fluent calculates these surface areas?