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Simulation of Blood Flow

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Old   May 19, 2014, 23:34
Default Simulation of Blood Flow
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Sathwik Singari
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Hello,

I am doing my thesis on "simulation Analysis Model for Non-Newtonian Blood Flow through Femoral Artery and Adjacent Tissue Medium"

I have modeled the artery using solid works then i have added tissue around the artery.In order blood to flow from artery to tissue i need to consider artery as permeable and tissue as porous medium. I do not know how to choose the Physics condition for this model.

Please some one help me in solving this issue.
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File Type: docx artery.docx (49.5 KB, 61 views)
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Old   May 20, 2014, 05:47
Default porous region
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Hi

assign the volume you want to be porous to a separate fluid region.

in the properties window -> type select the drop down menu and change from fluid region to porous region
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Old   May 20, 2014, 08:27
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What are the physics values i need to use for artery to make it permeable
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Old   May 20, 2014, 08:32
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I tried using multiphase flow but i did not get permeable option.
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Old   May 20, 2014, 10:13
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Why does the tissue to artery interface need to be permeable? If you just make it an in-place interface, that should allow fluid to move from one place to another. The backpressure from the tissue would keep all of the blood from leaving the artery, no?
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Old   May 20, 2014, 12:06
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Because artery should allow blood to pass to tissue.Do you want me to attach the file i have done till now?
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Old   May 20, 2014, 12:33
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I have attached the screen shots of physics conditions that i have used for my model.
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File Type: docx physics for vein and artery.docx (94.0 KB, 58 views)
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Old   May 20, 2014, 15:18
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Ah, if you're using VOF things are a little different.

You need to use the wall porosity model, and make the wall porous for one phase and resist another.
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Old   May 20, 2014, 16:04
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Sorry , I didnot get what you are saying ?where do i need ro use wall porosity?
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Old   May 20, 2014, 16:12
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That VOF function did not work. What physics do i need to use in order to get inplace as phase permeable.
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Old   May 20, 2014, 16:45
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In intersection folder-->inplace when am selecting inplace i am getting baffel interface instead of phase permeable
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Old   May 20, 2014, 17:25
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The function you're looking for is in the wall porosity model if you're using VOF. Turn it on for your phases and then turn your interface to a baffle. It will have phase condition options.
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Old   May 20, 2014, 17:31
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I didnot get the option called phase condition in interface i have only inplace with physics conditions.
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Old   May 20, 2014, 20:07
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Because you have an in-place interface. As I stated earlier, you need to use a baffle interface.
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Old   May 21, 2014, 08:20
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Thankyou I think this will help me.

One more question did you go through the word file i have attached in my previous msgs? I donot even know wether am using correct physcs or not because i am not sure wether i should create phases or not for tissue medium which is porous.I had choosen physcs conditions ramdomly 😔.for artery do i need to create two phase or one phase ?

Thankyou.
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Old   May 21, 2014, 09:07
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Hello,

I did the same but the flow is not directed to tissue from artery
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File Type: jpg porous tissue regions.jpg (8.8 KB, 16 views)
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Old   May 21, 2014, 09:12
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please see the attached file.See there is no flow directed to tissue from artery . even after making the inplace interface to baffle interface.
Attached Images
File Type: jpg regions for tissue medium.jpg (50.2 KB, 28 views)
File Type: jpg velocity plot.jpg (28.2 KB, 28 views)

Last edited by sathwik718; May 21, 2014 at 09:27. Reason: i forgot to attach a file
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Old   May 21, 2014, 09:38
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Did you set the phase conditions on the interface? A baffle interface with the default settings is just a wall.

You should not be choosing physics randomly. If you want a simulation that has usable results, you need to put thought into what and how you're simulating. As the old CAE saying goes - "garbage in, garbage out".

Using a porous media as the second domain sounds fine to me, I've seen it done before with injection simulations.
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Old   May 21, 2014, 09:50
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I tried using many physics conditions. I tried using VOF model and non VOF but there isn't any result.I donot know exactly what kind of physics i need to use to make it permeable.Yes i did phase condition for interface .
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Old   May 21, 2014, 10:16
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If you set the phase conditions on each side of the interface to be porous, the phase should move through the interface.
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