Diffusion coefficient expression

[NAGth]

Hello,

I am in doubt using the diffusion coefficients in my model. I red the documentation of the software and couldn't find its precise definition. I saw some articles, especially one about diffusion theory in the context of streets geometry and I am not sure I have to use the same definition with I Simpa.

So my question is : is the diffusion coefficient the ratio between diffuse energy and specularly reflected one ? If not I would be glad to know the exact one to enter my own coefficients.

Thank you for reading,

N. Aberkane-Gauthier

[UMRAE Official]

Yes, the diffusion coefficient is the ratio between diffuse and specular reflections:

• D=1 for 100% difuse reflection
• D=0 for 100% specular reflection

Best.

[NAGth]

Thanks for your help !

Best