Hello,

I am modelling Gray Radiation in ccm+. In the domain is a hot wall 1000K which is surrounded by other walls. The question is, do I have to set a temperature boundary condition on the surrounding walls, or is it sufficient enough to set Emissivity and Transmissivity and getting the Temperature as a result? Is the problem then fully constraint? From looking at the ccm+ online help for the radiant flux calculation it is not fully clear to me weather the surface temperature has to be given or not. If i set the other walls adiabatic they still pick up temperature.

Thanks,

In order for radiation problems to be fully defined you must have a boundary condition of a heat flux (may be adiabatic) or temperature. The one you input is your BC and you can solve for the other one.

Hope this helps.