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  1. AdamBown

    Using abaqus to model lifting gas

    Sdebock, Thank you for taking the time to reply. I have been able to use fluid cavities before to model gas filled, surface defined bags as in that air bag example. The difference with my new particular example is that I want to try and replicate the buoyant behaviour of a lifting gas such as...
  2. AdamBown

    Using abaqus to model lifting gas

    Morning All, Any one here ever used the fluid cavities of abaqus to model a bag of some description filled with a lifting gas, e.g. hydrogen, helium or hot air? It is getting the varying pressure distribution I am interested in. I know this can be done using user subroutine vdload, but I am...
  3. AdamBown

    'mirror' constraint

    If the above is not possible, then alternatively , anyone know how you stop surface nodes dropping of the edge of another surface, e.g. by extending master surface or similar? Nodes in question that are dropping off of edge, are fixed in the plane of surface edge, so in theory they shouldnt srop...
  4. AdamBown

    'mirror' constraint

    I am trying to find a constraint in abaqus analogous to something called a 'mirror' constraint in our own software. What the mirror constraint does is mirror the movements/deflections for a particular set of slave nodes, to a govening set of controlling master nodes, 1 to 1 mapping. This is...
  5. AdamBown

    Nodes constrained on arbitrary plane in Abaqus

    yep, that looks like the one. Cheers Corus and sdebock...
  6. AdamBown

    Nodes constrained on arbitrary plane in Abaqus

    Cheers Corus, good idea. I guess the local coord system can be input via the keyword *system. Would you know how the boundary is fixed relative to local system in the .inp file, e.g is it a sub option of *boundary? (unfortunately I am writing this inp from scratch rather than using CAE) Cheers...
  7. AdamBown

    Nodes constrained on arbitrary plane in Abaqus

    Hi, Trying to do something which I thought should be really easy but cant seem to find anything obvious. I am trying to constrain a single node, or set of nodes, to lie on a plane, e.g free to slide about within that plane. Translational restraint only. Plane can be defined by three nodes, or a...

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