[Weiqiang Liu]

Hi all,
I wanna define my own diffusion coefficient with DEFINE_DIFFUSIVITY macro. I need species molar weight to calculate effective diffusion coefficient. however, I don't want to set molar weight as constant. I want to loop all species molar weight with species index i.
I wonder is it doable in fluent. If it is, how can I do that?
Best regards.
Weiqiang

[Sowmiya]

Hi Sir
Did you find a solution? If so Can you suggest how to do?
I too face the same issue.
Please kindly give me few suggestions.

Regards
Sowmiya

[vinerm]

The solution to this is available within Fluent's UDF manual. Properties of species are indexed and can be accessed using indices starting with PROP_, e.g., PROP_mwi for molecular weight. Do note that these are only indices and need to be used as argument for the function generic_property to fetch the value of the property. Look for generic_property within Fluent UDF manual.

[Sowmiya]

Thank you for the instant reply. i will carry out your suggestions and let you know.


Thanks
Sowmiya

[the_sixth_hokage]

Originally Posted by vinerm

The solution to this is available within Fluent's UDF manual. Properties of species are indexed and can be accessed using indices starting with PROP_, e.g., PROP_mwi for molecular weight. Do note that these are only indices and need to be used as argument for the function generic_property to fetch the value of the property. Look for generic_property within Fluent UDF manual.

Hi is there any macros for accessing other properties such as critical temperature, critical volume, molecular weight etc of species...

I can't seem to find it in manuals...do you have any links to PDFs or sites?!