velocity equation for pulsation blood flow

[alifar]

Hi,
I want to simulate blood flow with Finite element software and want to put velocity as boundary condition in inlet, for pulsation flow I need to have velocity function and it should be related to time, angular velocity of blood and so on, actually I could not find that, anybody knows that equation or more information?

Regards
Ali

 

[rstupplebeen]

I googled "stent pulse load" and the second article mentioned a pressure load of 100mmHg. There were also many other articles to choose from.

http://www.nitinol.com/media/reference-library/017.pdf

Also, I was just at the Simulia Customer Conference (Abaqus) and there were many people working on stents. I would check out this link and try to contact authors that turn up on the search "stent"

http://www.simulia.com/forms/search-ucp.cgi

It does not have 2010 in the data base yet though.

Rob Stupplebeen

 

[alifar]

Hi Rob,

Thanks for your comment and links, that pdf file was interesting, yes in aorta we can consider 100 Torr(mmHg), you know I want to put velocity as a B.C.for entrance and zero pressure for out let to simulate pressure drop,unfortunately most of researchers and designers consider blood flow as a continuum and steady but blood is pulsation flow and we have velocity equation for that and it should be function of period of heart beat, nominal(initial) velocity and so on and velocity profile it does not looks like normal velocity profile in pipes, because of pulse wave we have wavy profile not parabolic one. I am looking for simple equation for that,actually I have complicated formula with a lot of parameter and bessel functions and it is difficult for me to define all of this parameters in COMSOL or ANSYS.
Thanks for your consideration.

Regards
Ali

 

[tifoso]

you can look at the cardivascular system modeling articles for that. Which part of the cardiovascular system velocity you need?

 

[alifar]

Hi

Actually I want to simulate blood flow in renal arteries,I have looked to blood flow articles and most of them they consider blood flow as a steady flow and fully developed flow without any pulsation formula,although some of them considered pulsation flow but formulas are different.
I got some info and equations about that for instance I should use wormesly number equation and same equation for blood pulsation but inside of that formulas we have Bessel function and I do not know how can define a bessel function in COMSOL or ANSYS.
Thanks