[Nektar-users] blood flow simulation

Dear all, I am trying to do a cardiovascular simulation by using Incompressible N-S solver in Nektar++. Here I have two questions about setting boundary conditions. First, how can I set RCR(windkessel model) boundary condition if I use Incompressible N-S solver? Is there any similar input file I can find? Second, do I need to make all the variable dimensionless when I set boundary conditions? Thank you very much! Best, Zhen