Radiation modelling

Toon

Hi

 

I am trying to perform a thermal analysis where a composite plate is subjected to radiation.

The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough.

How would I model this? I already did a test simulation which runs fine but it seems as if all the radiation is absorbed by the glass layer which of course is not what I want to achieve.

Either the way I modelled the radiation is wrong or either my radiation coefficients are wrong, these are the ones I used:

The radiation properties for glass: emissivity: 0.75 , specular transmissivity: 0.85 , diffuse transmissivity: 0 , specular reflectivity: 0.08 , diffuse reflectivity: 0

The radiation properties for aluminium: emissivity: 0.1 , specular transmissivity: 0 , diffuse transmissivity: 0 , specular reflectivity: 0.5 , diffuse reflectivity: 0.1

 

Any ideas or remarks?

acupro

From what I've been able to gather, in the released version 2019.1, radiation through glass will work only if there is no surrounding fluid medium, using either the P1 or DO radiation model, with the DO being more expensive but more accurate.  If there is a fluid medium, then only the DO model will work, but will require waiting for the 2020 released version.  You'll probably want to work with your local Altair Support team on this.