Hi, I am planning to implement a transition model into fluent using UDF feature. I was told that I can create my own transport equation in Fluent but I can't find any information about that in the help manuals. Wondering if somebody have tried that before? I know we can write source terms in Fluent, but is that enough on its on?

thanks

You can use User defined scalar (UDS). Check the 11th chapter of the UDF user manual

Thanks, it was all the time infront of me but i couldn't see it. I guess that what happens when you look too hard. again thanks a lot. Wassim

Once you plan to write ur own scalar transport equation, make sure that u pay attention to user defined memory. I have not used it much but still its stated in udf manual that u need to define ur memory location using udmi and then the uds are stored in that udm. Thanks

Rizwan, I think it is UDSI instead of UDMI. You have to define a user define scalar and its properties accordingly.

Yes it is UDSI only to define user defined scalar. what i meant by mentioning UDMI is, u have to allocate separte memory using UDMI to save the scalars that u are defininng. as fluent doesnt do it automatically.

[gouravjee]

Originally Posted by Rizwan
;139199

Yes it is UDSI only to define user defined scalar. what i meant by mentioning UDMI is, u have to allocate separte memory using UDMI to save the scalars that u are defininng. as fluent doesnt do it automatically.

i am working on a UDSI and, i have also used UDM for storing those values, but i am stuck in problem that my all udms are showing zero value
can you tell me where might be the problem