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Old   September 22, 2015, 17:49
Default stress free boundary condition
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Ari
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Hi everyone, does anyone know what is a "stress free" boundary condition? and how do you set that in FLUENT? I'm going to simulate the blood flow in a model of thoracic aorta. I've read some papers in which they talk about this stress free outflow BC to impose at the outlet. I've searched around but could't figure out what stress free boundary condition exactly is and how to impose it on fluent.
Any help would be really appreciated! thanks!
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Old   September 23, 2015, 03:23
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Quote:
Originally Posted by Ari View Post
Hi everyone, does anyone know what is a "stress free" boundary condition? and how do you set that in FLUENT? I'm going to simulate the blood flow in a model of thoracic aorta. I've read some papers in which they talk about this stress free outflow BC to impose at the outlet. I've searched around but could't figure out what stress free boundary condition exactly is and how to impose it on fluent.
Any help would be really appreciated! thanks!

it is often equivalent to set to zero the normal derivative of the velocity components
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Old   September 23, 2015, 16:32
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Originally Posted by FMDenaro View Post
it is often equivalent to set to zero the normal derivative of the velocity components
Thanks for your reply!
I also found this kind of explanation, but it still not clear to me how I'm supposed to impose this boundary condition at the outlet of my domain. I found some people talking about the use of symmetry condition in fluent but this is not clear to me since it seems to be more related to the no-slip condition at the wall and not at the outlet...
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