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flow simulation left heart chamber
Posted 19 avr. 2010, 10:06 UTC+2 Bioengineering 5 Replies
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I am trying to make a rough model of the blood flow in the left heart chamber.
Therefore, i have a 3-d model of an expanded left ventricle, that i import in Comsol. There i scale it to the approximately right size (100ml) and add the physics (subdomain settings: rho=1000 kg/m3, eta=0.004 Pa s; boundary: 5,7,8 -> outlet, pressure, no viscous stress, p=10 kPa,, 36, 37: inlet, pressure, p=15 kPa,, residue, wall, no slip).
I guess, this is thereabout like in real heart, but Comsol does not find a solution for this problem!
I dont know, why Comsol has so big problems. The inlet and outlet are almost the same size. I can play with pressure, but i does not find a possible solution.
I know, that there a big problems in this model, there is no pumping cycle and the walls are stiff. Unfortunately, i dont know how to implement this...
Does anybody know how to start and stop the blood flow? So that at one time, i have a filling of the heart and after this, the heart will be emptied? Maybe, this would help...
Or it would be a approach to get this static model run with understandable boundary settings...
I attached the model.
I am pleased to answer any question!
And I hope, that anybody can help!
Thanks a lot!
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How can i take care of turbulent flow or how can i consider this in the simulation?
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i.e. www.comsol.com/showroom/gallery/498/
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i tried to make the simulation in the k-e-Turbulence-Model, but i dont get it working.
There are always some errors.
I cant imagine, where the problem is. I just have a body, with two holes in it. One for inlet and one for outlet. That cant be such a problem.
I would be glad, if i could get the simulation working with any boundary settings, but i dont know which i should use...
you find attached a model, which is smaller than the correct one. with settings like:
pressure outlet: 150 Pa and velocity inlet: 0.6 m/s.
this one does come to an end, but when i scale the geometry to real size, it wont...
i ll try to get this small one running in the turbulence model. maybe there i ll see what is wrong.
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is there a way to simulate the inflow into an empty volume and after this, simulate the outflow of the liquid?
maybe with this, the physics would be represented better...