2 inlets 1 outlet blood mix

Cheng.P · October 3, 2023, 17:05

Hi everyone, I'm new to Fluent and have some questions. When I try to mix two blood flows in a Y-shape tube, they do not mix. Instead, their streamlines are parallel and do not cross to form vortices. I only used laminar model and set the boundary conditions two "velocity inlet" and one "pressure outlet". But even I set the inlet1 as 0 velocity, there is still no any flow through it. Is this because of the "velocity inlet" boundary conditions? Can anyone help me about this problem?
My goal is to use the blood from inlet2 to "push" the blood from inlet1 back(see the figure).

bloodflow · November 27, 2023, 15:57

What goes in, must come out. Inlet 2 cannot push flow back out of inlet 1. It can slow it down, but everything that comes in through inlet one, must leave through the outlet to conserve mass.

October 3, 2023, 17:05	2 inlets 1 outlet blood mix	#1
Cheng.P New Member Cheng Peng Join Date: Oct 2023 Posts: 1 Rep Power: 0	Hi everyone, I'm new to Fluent and have some questions. When I try to mix two blood flows in a Y-shape tube, they do not mix. Instead, their streamlines are parallel and do not cross to form vortices. I only used laminar model and set the boundary conditions two "velocity inlet" and one "pressure outlet". But even I set the inlet1 as 0 velocity, there is still no any flow through it. Is this because of the "velocity inlet" boundary conditions? Can anyone help me about this problem? My goal is to use the blood from inlet2 to "push" the blood from inlet1 back(see the figure).

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November 27, 2023, 15:57		#2
bloodflow Member Sebi Join Date: Mar 2019 Posts: 49 Rep Power: 7	What goes in, must come out. Inlet 2 cannot push flow back out of inlet 1. It can slow it down, but everything that comes in through inlet one, must leave through the outlet to conserve mass.