Differenz Inteface 1/9/18

Bennet Reiner
Bennet Reiner Altair Community Member
edited July 2021 in Community Q&A

Hello together,

did sombody already use the Interfaces 1/9 and 18 for Fliud-Interaction and can tell me the difference? The Dokumentation ist not really specific on the explanation.

Tnak you very much.

Best raggrds

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Answers

  • PaulAltair
    PaulAltair
    Altair Employee
    edited March 2021

    Hi,

    TYPE1 is a tied interface, for tying ALE nodes to a Lagrangian Surface (e.g. fluid domain in a container where the mesh does not match)

    TYPE9 is for contact between the 'outside' of an ALE domain and Lagrangian surface

    TYPE18 is a penalty method interface for the 'material' of an ALE mesh (as opposed to its grids) and a contained Lagrangian mesh in FSI problems, e.g. blast with MULTIMAT approach where the structural mesh is contained inside the ALE/EULER domain

     

     

  • Matthias Conjaerts_21193
    Matthias Conjaerts_21193 New Altair Community Member
    edited July 2021

    I used the type18 Interface for a simple flap inside a rectangular channel.

    I set the value for Interface stiffness and gap according to the help documentation.

    Is it somehow possible to check the contact in HyperView? I mean it looks "good", the clap is moving nicely, but I would like to check if the fluid flows around the flap and not through it.image

  • Mathis
    Mathis
    Altair Employee
    edited July 2021

    Hi Matthias,

    You can request the output of density and of the different volumetrc phases to do your checks.

    You will find attached a template file of engine with all the necessary outputs.

    Regards,

    Mathis

  • Matthias Conjaerts_21193
    Matthias Conjaerts_21193 New Altair Community Member
    edited July 2021

    Hi Mathis, thanks a lot!

    This template is very helpful. But I still didn't managed to do a proper check of the interface.
    The density plot doesn't show a real difference at the area of the clap. (density of clap = 1000 kg/m^3; fluid is Air) the mesh is of course a bit coarse, maybe that could be the problem.image

    The only value I get out of the volumefraction plot is zero. In this model I used /MAT/K-EPS and no multimaterial. Do I need to use /MAT/LAW51 to check the interface?

    On the FSI-Training I found this slide:

    imageAlthough my case is a bit different, it would be nice to be able to do a similar tuning of the interface.

     

  • Steffen
    Steffen New Altair Community Member
    edited July 2021

    Hello Matthias, 

    I have a very similar problem. If it is possible, could you share you rad file or just the contact definition and material properties. 

    Thank you and Regards Steffen Mathia

  • Matthias Conjaerts_21193
    Matthias Conjaerts_21193 New Altair Community Member
    edited July 2021

    Hi Steffen,

    I attached all the files you need to recreate my model. The .hm-file may be an older version, so better use the rad file. If you need anything else, let me know.

     

    Also I would be happy to hear from you, if you find a good way to solve the problem.

     

    Regards Matthias

  • Steffen
    Steffen New Altair Community Member
    edited July 2021

    Thank you for your help. 

    Yes as soon as I get any good result I will share my setup. 

    Regards Steffen

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