$gmshdiffusor

$gmshdiffusor is a special function to define the material parameters. Some materials are diffusive material so that we can apply the diffusor parameters. This command is similar to $diffusortype. However, this command goes with gmsh input setting.

The usage is:

$diffusortype
type_1 diffusion_length_1
type_2 diffusion_length_2
...
...  totalregions
...
type_Nth diffusion_length_N

In side the diffusor, the program will decide if it will change location depending on diffusion length.

Type 1,  random diffusion
Type 2,  cos dependent
Type 3,  cos^2 dependent

more detail can by found in $diffusortype.