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Mapped boundary condition warning message

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Old   October 2, 2015, 15:59
Unhappy Mapped boundary condition warning message
  #1
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Fernando Soares Alves
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Hi there Foamers,

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

Code:
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

Code:
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

Code:
--> 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
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Old   November 4, 2015, 09:39
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  #2
mgg
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Hallo Soares,

did you fix that issue?

Grüße,
Chu

Quote:
Originally Posted by FernandoSoares View Post
Hi there Foamers,

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

Code:
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

Code:
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

Code:
--> 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 is offline   Reply With Quote

Old   November 4, 2015, 12:30
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  #3
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Fernando Soares Alves
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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.
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Old   December 29, 2016, 17:01
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  #4
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Quote:
Originally Posted by mgg View Post
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.
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Old   July 6, 2019, 04:42
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Jianrui Zeng
Join Date: May 2018
Location: China
Posts: 157
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Quote:
Originally Posted by Eman. View Post
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.
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