[kjh9537]

Dear everyone,

I've never used UDF for Fluent.
I'm developing model for two phase slug flow inside pipe.
Now i'm trying to define fluctuating volume fraction at inlet to the time like this :
Volume fraction of liquid=0 for t=0 ~ t=0.1s
Volume fraction of liquid=1 for t=0.1s ~ t=0.2s
and makes it repeat.

And I realized this needs UDF.
Could somebody share code to establish this inlet boundary condition?
Any response will be appreciated and very helpful for me.
Thanks in advance.