[vhcongtltd]

Hello everyone,

I simulated flow in pipe. Type of boundaries: velocity inlet, pressure outlet, unsteady flow, material: water
At time t=100s I increased velocity at inlet boundary, U1, from 5cm/s to 7cm/s. And immediately, at t=100s, I also saw velocity at outlet boundary U2=7cm/s. However, I expected this variation (U2=7cm/s) occur at outlet boundary after several seconds (example t=102s,etc..). If we have long pipe, the variation occur immediately at both inlet and outlet at same time, that does not make sense.
I would appreciate if anyone can tell how to setup for model working.

Thank you,