How to specify Adiabatic wall (or insulated wall) between 2 solids in hyperworks CFD?

Jagan Adithya Elango
Jagan Adithya Elango Altair Community Member
edited June 2023 in Community Q&A

Hello experts,

This is simulate conjugate heat transfer problem where I don't want the heat from one solid to be transferred to another, so I specified a thermal boundary condition with of 0 heat flux on the interface between 2 solids.

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It gave me a warning (i.e: WARNING: Surface 24712698 of element BC "Perfectly_insulated" is in the interior) and didn't work meaning the heat was still getting transferred.

Is there any other way to perform this?

Thank you.

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Answers

  • acupro
    acupro
    Altair Employee
    edited June 2023

    To have this happen in reality, there would have to be some insulating layer between the two solids - to prevent/minimize the heat transfer.  The same is true in AcuSolve - since by default you have a single set of surface nodes shared by the two volumes.

    The heat-flux entry is for an applied heat flux, in addition to the heat transfer determined by the materials, temperature difference, etc.  For an external wall, it would be insulated with zero, but not so with internal.

    In HyperWorks CFD you would define a 'thin solid' on the surface between the two volumes.  In the definition of that you assign a thickness and a solid material.  If you want to minimize the heat transfer through that, give the thin solid a large thickness and the selected material a very small thermal conductivity.

    The thin solid is built (either upon export or during acuPrep) by splitting the surface nodes and preserving the zero-thickness volume element between them.  Now you can have different temperatures on the boundary of the two solids - and minimize the heat transfer between them.

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