# Fluid residence time

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 November 29, 2009, 16:11 Fluid residence time #1 New Member   Join Date: Oct 2009 Posts: 13 Rep Power: 9 Hello, I am modelling blood clotting in a vessel. I want to couple the residence time of the blood in my geometry with my viscosity, whose i know the formula. How can i calculate the residence time of the blood in my geometry? I tried using a new volumetric variable and assign it to a subdomain, but i do not know wether the values i get are right.

November 29, 2009, 17:58
#2
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Glenn Horrocks
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Yes, I think your approach should work. Use an additional variable with convection activated (but not diffusivity) and put a source term on it to increase its value by the timestep size each time step.

Quote:
 but i do not know wether the values i get are right
Well, you are going to have to work that one out. How do we know if your values are right?

November 30, 2009, 05:53
#3
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Quote:
 Originally Posted by uorinopuot Hello, I am modelling blood clotting in a vessel. I want to couple the residence time of the blood in my geometry with my viscosity, whose i know the formula. How can i calculate the residence time of the blood in my geometry? I tried using a new volumetric variable and assign it to a subdomain, but i do not know wether the values i get are right.
Could you use particle pathlines to do this?

 November 30, 2009, 17:29 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,707 Rep Power: 98 If you want to link the fluid residence time to viscosity the additional variable approach is much easier. It is tricky to do this with particles..... but not impossible.

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