[Nek5000-users] constant average velocity at inlet with periodic boundary conditions

[nek5000-users at lists.mcs.anl.gov]

Dear nek users,

I am simulating the flow in a 7 pin bundle mesh with periodic boundary conditions in Nek5000 and set the parameters p054 and p055 to -3 and 1, respectively. With these settings, the average velocity should be 1 in the geometry. This is however not what I am seeing; the maximum velocity is around 0.32.

I used the same set up for a 3-D pipe and the numerical solution behaves as expected.

Does anybody has details on how the fix mass flow rate/volumetric velocity are enforced in Nek5000?

Thanks,
Marco