[hogglife]

Hi all,

I want to run a derived case from the hotRadiationRoomFvDOM in the tutorial of openFoam v2206, in which the heater is modelled with a solid. I want to let the gas is non-participate about radiation, i.e. the solid heater transfer heat with the wall by radiation while the gas transfer heat with the solid heater and the wall by convection. In addition, I set the T of the wall to 1000 K, i.e. higher than the solid heater.

As hotRadiationRoomFvDOM, I use chtMultiRegionSimpleFoam + radiation. The radiation model is FvDOM for gas.

I have two questions:

1. In order to let the gas non-participate about radiation, I want to set absorption and emissivity of gas to a very low value. I can run the case successfully with absorption = emissivity = 0.1 for gas. But with absorption = emissivity = 0.05 or 0.01 for gas openFOAM fails to run after 3 time steps and said Negative Initial Temperature for the gas.

2. I want to change the absorption of the solid, but with absorption = 1 or = 0 in constant/SOLID/radiationProperties, I got the same results. solidAbsorption has been set for wallAbsorptionEmissionModel in constant/FLUID/boundaryRadiationProperties.

Could anyone give light on my questions?

I use openFOAM v2206.

Thank you in advance!