[ashtonJ]

Dear all,
I am modelling flow in an artery, which is initially (t = 0 s) unimpeded, then starts to narrow to form a constriction (t = 0.4 s) and finally returns to its initial non-constricted state (t=1 s). I use pressure waveform as inlet boundary condition and axial velocity waveform as outlet boundary condition (please see the attachment).


I have observed a recirculated flow proximal to the constriction experimentally, however, the modelling results do not predict that recirculation! The problem might be because of boundary conditions!!
Does anyone know what boundary condition could predict a recirculated flow proximal to the constriction?

Regards,
AshtonJ