Reply To: How can I give different transmissivity with more than 3 wavelength region?

[gopalakrishna.gangisetty]

Thank you very much for the response. I am using semi - transparent material and its emissivity is 0.25 for Long wave radiation, Refractive index is 2.2. I followed the instructions given by you. In the radiation tab, There is an option called beam direction where the default is X = 0, Y = 0 and Z = 1. I have an acceleration due to gravity set in Y direction = -9.81 m/s2. Then What is my direction. Should it be X = 0, Y = 1 and Z =0 or X = 0, Y = -1 and z = 0 given the Y = acceleration due to gravity = 9.81 and this application for natural convection ?

Please kindly help me.