File: ray-effect-diffusion.fee

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# ray-effect case solved with diffusion
 
DEFAULT_ARGUMENT_VALUE 1 quarter
PROBLEM neutron_diffusion 2D ALLOW_UNRESOLVED_BCS MESH ray-effect-$1.msh

c = 1/3
Sigma_t = 0.75
Sigma_s = c*Sigma_t

BC mirror mirror
BC vacuum vacuum

MATERIAL src  Sigma_t1=Sigma_t Sigma_s1.1=Sigma_s S1=1
MATERIAL bulk Sigma_t1=Sigma_t Sigma_s1.1=Sigma_s S1=0

SOLVE_PROBLEM

PRINT %.1f 10*phi1(0,1.875)

WRITE_RESULTS FILE $0-$1.msh