I am using CalculiX for conducting thermal simulations with radiation as only heat sink. Since my geometric model is given in mm I have to adjust the units of all other quantities accordingly. I did some reading in the ccx manual and the tips by Prof Kraska but still it is confusing which units I have to convert. From my understanding I have to convert Stefan-Boltzmann constant (W/mm^2/K^4), conductivity (W/mm/K), density (kg/mm), contact conductance (W/mm^2/K), volume and area heat flow (W/mm^3 and W/mm²) but energy (J) and Power (W) stay the same as if I would use meters? Or do I have to convert them to mm aswell (so for example: Watt as kgmm^2/s^3 instead of kgm^2/s^3)?
I would be glad if an experienced user could tell me which units I have to use for the above quantities.
Thanks in advance!