Dear Professor Sherwin, Sorry for the late reply and thank you for your help! Now we are trying to do cardiovascular flow simulation by Incompressible Navier-Stokes Solver. I want to use RCR model(Windkessel model) to set boundary conditions of pressure in the outlet of vessels. Here is the wiki page of Windkessel model(https://en.wikipedia.org/wiki/Windkessel_effect). Basically, we want to use the three-element Windkessel model(on that wiki page) and set parameters(R1, R2 and C) of the model in Nektar++ input file and run the simulation. Since we may have multiple outlets of a vessel, we also want to have the free to set Windkessel model boundaries for different outlets of the vessel. If the information I provide is not enough or unclear, please let me know. Many Thanks! Best, Zhen On Sun, Apr 28, 2019 at 3:44 PM Sherwin, Spencer J <s.sherwin@imperial.ac.uk> wrote:

Hi Both,

If we could document what we would like to have for the pressure BC related to the RCR condition I could help you get this implementation sorted.

Cheers, Spencer.

On 26 Apr 2019, at 00:35, Kurt Sansom <kayarre@gmail.com> wrote:

There isn't an RCR boundary condition implemented in the N-S solver. I attempted this a year or so ago, but got bogged down. There is a Womersley velocity boundary condition implemented.

If you would like to work on contributing this feature. I would be willing to help.

Regards, ~Kurt

On Thu, Apr 25, 2019 at 3:41 PM zxiong@sas.upenn.edu <zxiong@sas.upenn.edu> wrote:

...

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 _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users

-- Kurt Sansom _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users

Spencer Sherwin FREng, FRAeS Head, Aerodynamics, Director of Research Computing Service, Professor of Computational Fluid Mechanics, Department of Aeronautics, s.sherwin@imperial.ac.uk South Kensington Campus, Phone: +44 (0)20 7594 5052 Imperial College London, Fax: +44 (0)20 7594 1974 London, SW7 2AZ, UK http://www.imperial.ac.uk/people/s.sherwin/