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

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Kurt Sansom

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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/