Reply To: Unusual liquid velocity and bubble size distribution by using PBM

[zj X]

Thanks for your replying.I will try Custom Field Function.

And is there a solution to the bubble bin fraction in the head space? 
I write an udf to make the aggregation rate only below the liquid surface by limiting the height, but it didn't help.There are still bubble bin fraction above the liquid surface.
I can give more information if you need.