Learning Forum

[Jayda]

Hi Forum,

I've used an UDF for gray band absorption coefficient: DEFINE_GRAY_BAND_ABS_COEFF(gray_band_scat, c, t, nb).

Now I also want to define a UDF for gray band scattering coefficient. However, I do not see a definition for a gray band scattering function in the manual? I've tried DEFINE_GRAY_BAND_SCA_COEFF() but that does not work. I cannot load a UDF DEFINE_GRAY_BAND_ABS_COEFF() function into the scattering coefficient in the FLUENT materials panel neither.

Would you maybe know a solution? Thank you!

Jayda

[Surya Deb]

Hello,
Can you check DEFINE_PROPERTY to specify the scattering coefficient?
Check the link for more information on DEFINE_PROPERTY. [https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v212/en/flu_udf/flu_udf_sec_define_property.html]
Regards SD

[Jayda]

Hi SD Yes, I did. But I want the scattering coefficient to be identified per band, as I do with the absorption coefficient (via DEFINE_GRAY_BAND_ABS_COEFF). I know how to define a UDF of the class DEFINE_PROPERTY. The issue is that via DEFINE_PROPERTY there cannot be a scattering coefficient that is different in different light wavelight bands.

Why is this not possible for the scattering coefficient? And is there a way around? Thanks!

Kind regards
Jayda

[JA_95]

Hi Jayda I am trying as well to solve this problem, did you find how to do it?
Thank you very much and kind regards JA