stress free boundary condition
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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it is often equivalent to set to zero the normal derivative of the velocity components |
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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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[LaTeX Error: Syntax error] I have a sheet of compressible elastic material that is resting on one edge, and the others are free to move. I know that there is going to be no stress on the boundary and no shear. Would the above BC cover the conditions? |
Latex formula showing but,
Normal derivative equal to zero is the impenetrable BC for a slip-wall. If you have a free surface of an elastic solid (which I suspect you do from your bajillion other posts) then you need the entire stress tensor going to zero. For the butted end, normal derivative of velocity going to zero is okay because that is also the impenetrable BC. |
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Cheers. |
Your case is 1D, your "entire" stress tensor is only one derivative
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