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 MUMMED November 25, 2013 05:37

calculating time residence in an axial pump

Hi,
I'm trying to calculate time residence of blood in an axial blood pump and I have no idea how to do it.
Thanks for any advice.

 singer1812 November 25, 2013 10:48

-Create a new varible i.e. rtime [s]
-Create subdomain of your whole domain and set a constant source term for rtime in that subdomain
-Set rtime = 0 at your inlet
-Run solution solving for this variable (you can freeze your old solution and just run solving for this variable if you already have a result).

For more details - Look up "Age of Air" in the search

 MUMMED November 25, 2013 11:08

Quote:
 Originally Posted by singer1812 (Post 463408) Steady State Solution? Short answer: -Create a new varible i.e. rtime [s] -Create subdomain of your whole domain and set a constant source term for rtime in that subdomain -Set rtime = 0 at your inlet -Run solution solving for this variable (you can freeze your old solution and just run solving for this variable if you already have a result). For more details - Look up "Age of Air" in the search
yes it's steady state and
Thank you a lot, that was very helpful .

 ghorrocks November 25, 2013 17:06

For steady state simulations you can also do this using a streamline. This has the advantage that it is just post-processing, you do not need to do a new simulation.

Put a streamline on your domain starting from the time=0 point. On the color tab of the streamline select mode=time. That's all, very simple.

 MUMMED November 26, 2013 05:10

thanks Glenn

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