warnings in boundary condition while running simulation

avb
avb Altair Community Member
edited February 2023 in Community Q&A

I am getting the following Potential errors in Boundary condition.

*** WARNING: Duplicate convective_heat_flux element BC for surface 398392879 set "inter_AL_AIR quad4 AL pyr5"

*** WARNING: Duplicate heat_flux element BC for surface 398388637 set "inter_AL_AIR quad4 AL pyr5"

*** WARNING: Surface 398105821 of element BC "inter_sair1_fAIR tria3 sair1 wedge6" is in the interior

*** WARNING: Surface 398111596 of element BC "inter_sair1_fAIR quad4 sair1 hex8" is in the interior

*** WARNING: Duplicate convective_heat_flux element BC for surface 398392879 set "inter_AL_AIR quad4 AL pyr5"

 

 What should i change as these interface surfaces dont exist while meshing in Hyprmesh

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Answers

  • acupro
    acupro
    Altair Employee
    edited February 2023

    What is your simulation model?  Multiple volumes?  Fluids and solids, etc?  Can you share additional information, images, etc?

  • avb
    avb Altair Community Member
    edited February 2023
    acupro_21778 said:

    What is your simulation model?  Multiple volumes?  Fluids and solids, etc?  Can you share additional information, images, etc?

    its basically air inside aluminium frame.

    i have added air into different components for ease of getting the location specific temperature values

  • acupro
    acupro
    Altair Employee
    edited February 2023
    avb said:

    its basically air inside aluminium frame.

    i have added air into different components for ease of getting the location specific temperature values

    Have you deactivated the boundary conditions on the surfaces between fluid volumes (where there should not be walls)?  Are you setting this up in HyperMesh?

  • avb
    avb Altair Community Member
    edited February 2023
    acupro_21778 said:

    Have you deactivated the boundary conditions on the surfaces between fluid volumes (where there should not be walls)?  Are you setting this up in HyperMesh?

    No, I didnt deactivate Boundary conditions

    I thought it wont make a difference. Will it ?

     

  • acupro
    acupro
    Altair Employee
    edited February 2023
    avb said:

    No, I didnt deactivate Boundary conditions

    I thought it wont make a difference. Will it ?

     

    Are you setting this up in HyperMesh?  Or a different tool?

    If boundaries between fluids are written as type = wall, you will get warnings as you show.  If they are written as type = auto_wall, you should not get those warnings.

    You may want to try HyperWorks CFD for problem setup, as the HM interface hasn't been updated in a while, now that there are other tools to use.

  • avb
    avb Altair Community Member
    edited February 2023
    acupro_21778 said:

    Are you setting this up in HyperMesh?  Or a different tool?

    If boundaries between fluids are written as type = wall, you will get warnings as you show.  If they are written as type = auto_wall, you should not get those warnings.

    You may want to try HyperWorks CFD for problem setup, as the HM interface hasn't been updated in a while, now that there are other tools to use.

    but what effect will there be if the Boundary condition is turned off? Will the results be incorrect

  • acupro
    acupro
    Altair Employee
    edited February 2023
    avb said:

    but what effect will there be if the Boundary condition is turned off? Will the results be incorrect

    If these are surfaces between different portions of the same fluid - not an actual wall - they should not have any boundary conditions.  (type = auto_wall takes care of that, too).  If it's a true boundary - like a physical wall - then, yes, you need the boundary condition.

    Maybe attach the complete .inp and .Log files.

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