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  1. Replies
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    178

    Hi Kinga, Yes, both should be applied to...

    Hi Kinga,

    Yes, both should be applied to reproduce that initial equilibrium state.

    Let me know if you need further clarifications.

    Best,

    Gerard
  2. Hi Laura, Yes, you do need a boundary...

    Hi Laura,

    Yes, you do need a boundary condition that allows the fluid to exit, or else there will not be much of a transient response. This is typically done by prescribing zero fluid pressure on...
  3. Hi Laura, A biphasic material does not...

    Hi Laura,

    A biphasic material does not strictly account for swelling, though the fluid pressure boundary condition may be used to simulate osmotic loading (shrinking) under the assumption that the...
  4. Hi Mousa, Happy New Year to you as well. ...

    Hi Mousa,

    Happy New Year to you as well.

    Sorry, I had missed the part where you said that both contact surfaces are rigid. In that case auto-penalty should not be used (it won't work since...
  5. Hi Mousa, In the simplest case (i.e., when...

    Hi Mousa,

    In the simplest case (i.e., when laugon=0, penalty=1, auto_penalty=0), the contact pressure is equal to the contact gap, since (contact pressure) = penalty*(contact gap). In practice,...
  6. Hi, Yes, all moduli have the same units....

    Hi,

    Yes, all moduli have the same units.
    Using the standard notation found on Wikipedia, the correspondence is C10 = c1, C01 = c2, C11 = 0.

    Best,

    Gerard
  7. Hi, Can you please clarify the question "how...

    Hi,

    Can you please clarify the question "how can I mesh my models in 3D, through the full depth?"

    Best,

    Gerard
  8. Replies
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    243

    Hi Peter, If you are running a diffusion...

    Hi Peter,

    If you are running a diffusion analysis with very little convection, changes to the permeability will have virtually no effect on the solute concentration profile, so I am not surprised...
  9. Hi, I think the main issue with your model is...

    Hi,

    I think the main issue with your model is that the force on the indenter is going upward (positive) when it should be pointing downward. So you need to negate the load you are applying, to...
  10. Replies
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    Hi Harley, You can control the mesh size in...

    Hi Harley,

    You can control the mesh size in Tetgen by specifying the Element size. For your model I suggest trying 0.14.
    The easiest way is to select elements and hide them to see elements inside...
  11. Hi Albert, It is not easy to diagnose your...

    Hi Albert,

    It is not easy to diagnose your problem with the information provided. Have you tried varying the spring stiffness by an order of magnitude up or down to see if that improves/worsens...
  12. Hi Armand, I am not sure I understand what you...

    Hi Armand,

    I am not sure I understand what you are trying to do. The model you attached is an incompressible solid (not a fluid) which is constrained from deforming in all directions except the...
  13. Replies
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    Hi Haaris, Currently the biphasic and...

    Hi Haaris,

    Currently the biphasic and multiphasic modules cannot perform dynamic analyses. We plan to introduce this feature in the future, but this won't happen for a while. (Adding dynamic...
  14. Replies
    3
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    243

    Hi Peter, The multiphasic material domain...

    Hi Peter,

    The multiphasic material domain allows you to specify solid-bound molecules whose referential mass density (mass-based concentration, per volume in the reference configuration) may...
  15. Replies
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    4,153

    Hi, The file you have attached does not have...

    Hi,

    The file you have attached does not have any boundary conditions, so the analysis will fail since there is nothing to constrain the geometry.

    Please keep in mind that the application of...
  16. Replies
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    178

    Hi Kinga, In a biphasic-solute analysis the...

    Hi Kinga,

    In a biphasic-solute analysis the porous material may include one neutral solute, let's call it A. In any analysis you can choose to prescribe the initial concentration cA0 of that...
  17. Hi, The only non-zero internal forces you can...

    Hi,

    The only non-zero internal forces you can retrieve are the reaction forces at nodes where displacements have been prescribed. At all other nodes the output will be zero.
    No, the internal...
  18. Hi Lewis, Yes. Yes. Best, Gerard

    Hi Lewis,

    Yes.
    Yes.

    Best,

    Gerard
  19. Replies
    3
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    186

    Hi, In FEBio2 the density is only taken from...

    Hi,

    In FEBio2 the density is only taken from the parent material, that's why you need to move the <density> field to the <viscoelastic> material. In FEBio3 this issue will be fixed.

    Regarding...
  20. Replies
    3
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    186

    Hi, In principle what you are doing should...

    Hi,

    In principle what you are doing should work, i.e., setting g1=0 should recover the elastic response. The fact that you get a very different response suggests that the issue is elsewhere. Can...
  21. Replies
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    150

    Hi Peter, Since the solid matrix does not...

    Hi Peter,

    Since the solid matrix does not deform in this problem, you should set dtol=0. Currently your model struggles with convergence on the displacement, even though the displacement residual...
  22. Replies
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    201

    Hi, Try this problem with "sliding-elastic"...

    Hi,

    Try this problem with "sliding-elastic" instead of "sliding-with-gaps" and see if it works better. "sliding-elastic" is our most recent implementation of frictional contact, it may give you...
  23. Hi Ann, To constrain radial displacements on a...

    Hi Ann,

    To constrain radial displacements on a cylindrical surface you can also use the Symmetry Plane constraint. Despite its name, this constraint is more general as it enforces zero...
  24. Replies
    2
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    182

    Hi, The FSI solver is not suitable for porous...

    Hi,

    The FSI solver is not suitable for porous media problems. You need to use the biphasic solver (which is suitable for poroelasticity) to prescribe a fluid pressure across a porous material. A...
  25. Hi Lewis, In principle (i.e., if the penalty...

    Hi Lewis,

    In principle (i.e., if the penalty parameter for the symmetry plane is high enough), the axisymmetric analysis results between a 1/4 (90-degree) model and a narrow wedge (3-degree) model...
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