[nazmulislam]

Hi,


I am trying to observe unsteady, laminar and incompressible flow through an axisymmetric periodic tube.


I have initialised the uniform velocity (along the tube axis) inside the tube and imposed periodic boundary conditions (cyclicAMI) at the inlet and outlet.



Now, I would like to create an oscillatory flow. I found a tutorial "pitzDailyPulse" with the solver "pimpleFoam" for laminar, incompressible flow. In this tutorial, the velocities are distributed at the inlet using the trigonometric COSINE function.



However, since I have imposed cyclicAMI boundary conditions at the inlet and outlet, I cant provide velocities at the inlet. It is mentioned that previously I tried to provide velocity at the inlet with cyclicAMI boundary conditions at the inlet and outlet, it did not work. For that reason, I initialised the uniform velocity inside the tube with cyclicAMI boundary conditions at the inlet and outlet and it worked. Please see more details in the following link:
Periodic BC for a Periodic Tube



I appreciate your suggestions in this regard.


Thanks in advance.