The set up has 3 domains, a one fluid domain, a solid domain and a 2 fluid domain. Energy transfer is coupled across them by CHT.
In the 2 fluid domain there are 2 energy equations, in the other two only one. Unfortunately the energy subsystem has been set up
with only one energy equation allowed for. This is due to the fact that the one fluid domain comes first ! This should be griped.
A work around is to alter the domain order so that the 2 fluid domain comes first.
