Question about Fluent post-processing regarding calculation of Wall Heat Flux
I am simulating a rotating disk in a free flow. I am using an axi-symmetric boundary condition and swirl is put on. The domain is a square, where the bottom boundary is the axi-symmetry boundary, the right boundary is the rotating wall (rotating around the symmetry axis) and the top and left boundary are ambient air with a fixed temperature. Furthermore there is a fixed temperature boundary condition on the plate.
Furthermore I am using a k-omega SST turbulence model. My mesh at the wall also has a yplus lower than 1.
I am calculating the heat flux from the start of the plate (the point at the wall and the symmetry axis at the bottom right) to half of the plate. However I have a question about how this wall heat flux is computed. In the theory guide it states that this is done by using: q=k_f * (dT/dn), however when I calculate the temperature gradient with the post processing and multiply it with the k_f (thermal conductivity of fluid) I am not obtaining the wall heat flux also calculated by the post processing. Could somebody maybe help me on what I am doing wrong in computing the wall heat flux, the same way as the post processing?
Thank you in advance!