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Pressure boundary condition for solids in multiRegion?

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Old   September 16, 2021, 14:31
Default Pressure boundary condition for solids in multiRegion?
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Claudia
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Hey guys,


i am using chtMultiRegion and i was wondering if I got the boundary conditions for my solid region wrong.


Right now it is:
internalField 1e5;

boundaryField
{

"solid_to_*"

{ type calculated;
value 0;
}}


is that okay? or should they both be 0? or 1e5?



Right now i am running a transient case and get the "number of iterations exceeded" error for this solid after about 1000 iterations. So I am guessing, that the mesh is the problem, but i just wanted to check, if this boundary condition could be the reason.


I hope, someone can help me with this
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Old   September 17, 2021, 04:31
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Lukas
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Pressure Terms are not solved for the Solids normaly u do this for p-file in solids:
Code:
    ".*"
    {
        type            calculated;
        value           $internalField;
    }

If it does not converge it is most of the time a mesh problem u can check this with

checkMesh -region regionthatdiverges
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Old   September 18, 2021, 06:15
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The pressure field is not used. It is simply there because the thermopysical properties class used for all solids/fluids (all the options in your thermoPhysicalProperties file) is programmed with a pressure field. Hence it does not check...is it an incompressible solid where pressure does not effect thermal conductivity. Hence you need a valid file, but it is not used. In one recent version this was even removed. So for easier postprocessing you can simply choose the baseline value of your fluid domain so that the pressure is shown in that color in paraview. And either calculated or zeroGradient boundary conditions for the same purpose.
saidc. and aadicfd like this.
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