For a radiation problem insist the internally created  eigevalue constant scalar field is output in similar way  to the timestep. 
For a radiation problem insist the internally created 
eigevalue constant scalar field is output in similar way 
to the timestep. 

This works via checking if the first 19 characters of the 
scalar field name == 'NeutralParticleKeff' 


FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids