# calculating time residence in an axial pump

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 November 25, 2013, 05:37 calculating time residence in an axial pump #1 Member   Mohamad Alagheband Join Date: Oct 2012 Posts: 41 Rep Power: 7 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.

 November 25, 2013, 10:48 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 14 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

November 25, 2013, 11:08
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 Originally Posted by singer1812 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
Thank you a lot, that was very helpful .

 November 25, 2013, 17:06 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,219 Rep Power: 110 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 likes this.

 November 26, 2013, 05:10 #5 Member   Mohamad Alagheband Join Date: Oct 2012 Posts: 41 Rep Power: 7 thanks Glenn

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