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Applying a pressure boundary condition

Posted 22.04.2014, 10:43 GMT-4 Fluid & Heat, Structural Mechanics Version 4.3b 1 Reply

William Hoggatt
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Hello All,

I am having an issue with modeling blood flow through an artery. There is an example in the forum, but it is not helping me. I have two rectangular domains that share a side in 2D axisymmetric mode. One represents the blood flow, modeled in the laminar flow module, and one represents the artery wall, modeled in the solid mechanics module. I can get laminar flow through one domain, but I want to apply the pressure generated by the laminar flow to the wall of the artery (the shared side of the rectangles). I have tried inputting the variable spf.T_stressz, p and spf.Fr into the boundary load of the solid mechanics module, but I am still getting no pressure for my results.

I have also fixed the outside of the artery so that it can't move, but the interior wall of the artery can be moved if the pressure is large enough. I think I can just set it as a moving wall to achieve that effect.

Best,

-Will
1 Reply Last Post 14.06.2014, 02:26 GMT-4
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Hello William Hoggatt

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Amrutha Machireddy
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Posted: 1 decade ago 14.06.2014, 02:26 GMT-4
hi,

We have been trying this model in our lab. Unfortunately, we are also facing the same problem.
I have done exactly the same thing which you have mentioned. We gave a pulsating pressure input to the inlet of the laminar flow. We were expecting a pressure wave propagation along the arterial walls. We could see a displacement in the arterial wall due to the pulsating pressure. Unfortunately, we were unable to see the wave propagation ( or in other words the speed of wave propagation was infinity). In a nutshell, we are not able to model arterial compliance properly. The wall is acting like a perfect rigid body.

I hope you might have seen this model.
www.rpi.edu/dept/chem-eng/WWW/faculty/plawsky/Comsol%20Modules/ArteryFlat/ArteryFlat.html

Did you make any progress in this topic ?

Regards,
hi, We have been trying this model in our lab. Unfortunately, we are also facing the same problem. I have done exactly the same thing which you have mentioned. We gave a pulsating pressure input to the inlet of the laminar flow. We were expecting a pressure wave propagation along the arterial walls. We could see a displacement in the arterial wall due to the pulsating pressure. Unfortunately, we were unable to see the wave propagation ( or in other words the speed of wave propagation was infinity). In a nutshell, we are not able to model arterial compliance properly. The wall is acting like a perfect rigid body. I hope you might have seen this model. http://www.rpi.edu/dept/chem-eng/WWW/faculty/plawsky/Comsol%20Modules/ArteryFlat/ArteryFlat.html Did you make any progress in this topic ? Regards,

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