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Thread: Biphasic Unconfined Compression Relaxation

  1. #41
    Join Date
    Nov 2007
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    Salt Lake City, UTAH
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    1,683

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    This tutorial has been updated to use PreView 1.12 and FEBio 1.6.

    Steve
    Department of Bioengineering, University of Utah
    Scientific Computing and Imaging institute, University of Utah

  2. #42
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    Nov 2007
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    This tutorial has been updated to use PreView 1.12 and FEBio 1.6.

    Steve
    Department of Bioengineering, University of Utah
    Scientific Computing and Imaging institute, University of Utah

  3. #43
    Join Date
    Jan 2015
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    5

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    Hi,
    I am trying to run the unconfined compression example using manuel.prv preview file. It seems like the zero pressure boundary condition on the outer face of the quarter cylinder model is not enforced. The pressure there is nonzero, comparable to the inside pressure in magnitude. Also, the pressure does not decay fast enough in the tissue. (After 4000 seconds, it is still far from being very small.) Since this is a tutorial example, I understand what is going one. I have not intervened with the input file.
    Any help will be appreciated. Thanks.

    Ahmet

  4. #44
    Join Date
    Dec 2007
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    652

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    Hi Ahmet,

    Please don't use manuel.prv, this is not a file that is being updated as part of the distribution of PreView. If you have downloaded PreView from febio.org, look for the folder called Examples. It contains the tutorials that normally should be updated with every release. The file 'tutorial5.prv' contains the biphasic unconfined compression example.

    I use PreView on the Mac. To locate the Examples folder, you need to right-click on the PreView application icon and select Show Package Contents. Then navigate through Contents/Resources/Examples. For other operating systems I am not sure where the Examples folder is located.

    Best,

    Gerard

  5. #45
    Join Date
    Jan 2015
    Posts
    5

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    Thank you for answering so quickly.

    What does degrees of freedom (DOF) in the tet10?

    A. (10 node displacement=30 DOF,
    4 Node pressure=4 DOF
    Total=34 DOF)

    or

    B. (10 node displacement=30 DOF,
    10 Node pressure=10 DOF
    Total 40 DOF)

    Which is used in FEBio? (A?, B?)

    Sincerely,
    Ahmet

  6. #46
    Join Date
    Dec 2007
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    652

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    Hi Ahmet,

    It is B. Each node has 3 displacement DOFs and 1 pressure DOF.

    Best,

    Gerard

  7. #47
    Join Date
    Mar 2017
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    Many thanks!

  8. #48
    Join Date
    Jul 2017
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    1

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    Hello I have a quick question. Does FEBIO have fiber features for the "biphasic" material, just like it has the fiber option for the "neo-Hookean" material? Because everytime I try to run my code, I always get a zero diagonal error.

    Thank you,
    abhi1947

  9. #49
    Join Date
    Dec 2007
    Posts
    652

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    Hi abhi1947,

    The fiber should work with the biphasic material. Can you post a (small) file that illustrates the problem you are having?

    Best,

    Gerard

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