[vb276]

Hello,
I am trying to simulate a pipe flow ,and boundary condition for temperature at outer is
fixedGradient
gradient uniform -100,
but after decomposePar ,the BC change to
fixedGradient
gradient nonuniform List<scalar>
before decomposePar

[boundaryField
{
    inter
    {
        type            zeroGradient;
    }

    outer
    {
        type            fixedGradient;
        gradient           uniform -100;       
    }   
    inlet1
    {
        type            cyclic;
    }
    outlet1
    {
        type            cyclic;
    }
    left
    {
        type            cyclic;
    }
    right
    {
        type            cyclic;
    }
}]
after decomposePar[boundaryField
{
    inter
    {
        type            zeroGradient;
    }
    outer
    {
        type            fixedGradient;
        gradient        nonuniform List<scalar> 0();
    }
    inlet1
    {
        type            cyclic;
    }
    outlet1
    {
        type            cyclic;
    }
    left
    {
        type            cyclic;
    }
    right
    {
        type            cyclic;
    }
    procBoundary0to1
    {
        type            processor;
        value           uniform 300;
    }
    procBoundary0to2
    {
        type            processor;
        value           uniform 300;
    }
}
]

is there anyone who know the reason?

[jherb]

nonuniform List<scalar> 0(); means that there are 0 faces of this patch calculated on the processor you looked at. If you look at this field file in the other processor directories you will find one/more which contain the correct value, because on this/these processor(s) the boundary is really used.

[popkeo]

I agree with jherb, there are several processors folder, because outer is not distributed to the folder you check
If possible you can decrease the parallel number, and check each processor folder, there should be one folder with the right boundary conditions you need.
outer
{
type fixedGradient;
gradient uniform -100;
}

[Sulivar]

Based on the preliminary research, the working hypothesis is that the master reads the field (but directly from the case, and not from its 'processor0' directory) and then sends the relevant subset to all of the slaves. It would appear that the dictionary that was sent to the slave processors has no entries.
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