[erfan.tajalli]

Dear friends

My case:
I am simulating a simple rectangular channel that contains several rods as heat sources. I am interested to investigate the effect of the absorption coefficient. I have provided the CFX my desired absorption coefficient as a function of wavelength and the temperature (is attached).

Now, I am working with multi-band spectral model and I have 2 problems:
1. In CFX, I can only define the bands and not the value of my desired quantities in every band. According to the CFX user's guide and theory guide, the value at every band is the midpoint value. I like to see the chosen exact value (of the absorption coefficient) at each band in the simulation.

2. If I define the bands in a discrete method (e.g. first band:10 micron-20micron and second band:30micron-100micron) the solution will not converge but with continuous bands, it will converge. I would like to define the bands such that they cover only the bumps or the peaks of the absorption coefficient plot(see figure).

I would appreciate it if you share your experiences with me.