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Old   November 29, 2009, 16:11
Default Fluid residence time
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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.
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Old   November 29, 2009, 17:58
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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?
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Old   November 30, 2009, 05:53
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Quote:
Originally Posted by uorinopuot View Post
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?
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Old   November 30, 2009, 17:29
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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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