[Tanjina]

Hello,

I am modeling a reservoir-pipe system, where with time water from reservoir will drain out through pipe. I am using Ansys Fluent. I think it's pretty common simulation.

But I have one confusion. For top of the reservoir, what BC should I use ? Wall BC ( I assigned one zone above the top of the reservoir ar patched that zone with air) , or should I use pressure inlet and allow air to enter ?

Any suggestion will be highly appreciated.

Regards,
Tanjina