[BlueCat]

Hello all,

First of all thank you for the support provide to the CFD community with this forum.

I am using a transient model to analyze the aorta blood flow. My boundary conditions are a mass flow waiveform at the aorta inlet and the Windkessel model at the outlet. I am using Piso solver. My problem is that the aorta waiverform has a negative peak (reflux through the aorta valve), once the simulation reaches this negative value the solution diverges. I have tried to reduce the time step, to use an adapative time step, to refine the mesh, but nothing worked.
Did anybody experience the same problem?

Thank you in adavance.