[FernandoSoares]

Hi there Foamers,

I am trying to improve my simulation using the mapped boundary condition on OF240. I found it on a tutorial

$FOAM_RUN/incompressible/pisoFoam/les/pitzDailyMapped

Since my geometry is pretty similar (also a backward facing step) to the one used in the tutorial I imagined I'd have no issues trying to use such a b.c. .

In my blockMeshDict file I defined it as

boundary
(
    inlet                       //0
    {
        type            mappedPatch;
        offset          (-20 0 0 );
        sampleregion    region0;
        sampleMode      nearestCell;
        samplePatch     none;
        faces
        (
        ...
        );
    }
...
)

just as in the tutorial mentioned, and in 0/U as

boundaryField
{
    inlet
    {
        type            mapped;
        value           nonuniform List<vector> 90( ... );        interpolationScheme     cell;
        setAverage              true;
        average                 (1 0 0);
    }
...
}

My simulation stars fine, however I get the following message

--> FOAM Warning :
    From function mappedPatchBase::mappedPatchBase
(
    const polyPatch& pp,
    const word& sampleRegion,
    const sampleMode mode,
    const word& samplePatch,
    const vector& offset
)

    in file mappedPatches/mappedPolyPatch/mappedPatchBase.C at line 631
    Did not find 90 out of 90 total samples. Sampling these on owner cell centre instead.
On patch inlet on region region0 in mode nearestCell
with offset mode uniform. Suppressing further warnings from mappedPatch

What have I set wong? I know the tutorial isn't really for a steady state problem (LES, pisoFoam, etc.), but I believed I was using it properly (which I am probably not). I would like to map the plane at x=-20 with (1 0 0) as normal vector for my U field at the inlet. Is offset defined correctly?

Has anyone ever faced such mesage(s) using this b.c.? Any experienced Foamer? I looked at the code but I didn't really get why I am having this issue.

Any help would be greatly appreciated.

F. Soares

[mgg]

Hallo Soares,

did you fix that issue?

Grüße,
Chu

Originally Posted by FernandoSoares

Hi there Foamers,

I am trying to improve my simulation using the mapped boundary condition on OF240. I found it on a tutorial

$FOAM_RUN/incompressible/pisoFoam/les/pitzDailyMapped

Since my geometry is pretty similar (also a backward facing step) to the one used in the tutorial I imagined I'd have no issues trying to use such a b.c. .

In my blockMeshDict file I defined it as

boundary
(
    inlet                       //0
    {
        type            mappedPatch;
        offset          (-20 0 0 );
        sampleregion    region0;
        sampleMode      nearestCell;
        samplePatch     none;
        faces
        (
        ...
        );
    }
...
)

just as in the tutorial mentioned, and in 0/U as

boundaryField
{
    inlet
    {
        type            mapped;
        value           nonuniform List<vector> 90( ... );        interpolationScheme     cell;
        setAverage              true;
        average                 (1 0 0);
    }
...
}

My simulation stars fine, however I get the following message

--> FOAM Warning :
    From function mappedPatchBase::mappedPatchBase
(
    const polyPatch& pp,
    const word& sampleRegion,
    const sampleMode mode,
    const word& samplePatch,
    const vector& offset
)

    in file mappedPatches/mappedPolyPatch/mappedPatchBase.C at line 631
    Did not find 90 out of 90 total samples. Sampling these on owner cell centre instead.
On patch inlet on region region0 in mode nearestCell
with offset mode uniform. Suppressing further warnings from mappedPatch

What have I set wong? I know the tutorial isn't really for a steady state problem (LES, pisoFoam, etc.), but I believed I was using it properly (which I am probably not). I would like to map the plane at x=-20 with (1 0 0) as normal vector for my U field at the inlet. Is offset defined correctly?

Has anyone ever faced such mesage(s) using this b.c.? Any experienced Foamer? I looked at the code but I didn't really get why I am having this issue.

Any help would be greatly appreciated.

F. Soares

[FernandoSoares]

Hi.

Actually I have not. I believe I just increased my inlet region before the step, which is not optimal but it was better than nothing. Anyway good luck.

Mit freundlichen Grüßen,

F. Soares.

[Eman.]

Originally Posted by mgg

Hallo Soares,

did you fix that issue?

Grüße,
Chu

Hi,

Probably you wouldn't need the answer anymore. I had the same problem, and it was due to my rotated coordinate system. Whenever the offset vector is out of your domain you get this warning. In my case, my initial offset vector was (0 0 10) and I had to reverse its direction. I used (0 0 -10) and it worked just fine.

[calf.Z]

Originally Posted by Eman.

Hi,

Probably you wouldn't need the answer anymore. I had the same problem, and it was due to my rotated coordinate system. Whenever the offset vector is out of your domain you get this warning. In my case, my initial offset vector was (0 0 10) and I had to reverse its direction. I used (0 0 -10) and it worked just fine.

I got the warning that did not find 1253 out of 12354 total samples.... I am sure I did not mix up the direction. So I do not know why.