I’ve been trying to simulate water flow through a thin pipe.
An initial attempt worked well and I got a result that was in line with what I was expecting.
Then I slightly changed the shape and the results became very weird, the speed was 20 times as high and I don’t understand the reason for that
I don’t understand what I’m doing wrong and would appreciate any input!
Also, isn’t it necessary for turbulent flow to know how rough the surface of the pipe is?
Thanks and best wishes,