[amin144]

Hi dear Foamers!

I have a 3D rectangular straight pipe align z axis.
I want to sample data in a plane normal to main flow and use this sampleDic:

surfaceFormat vtk;
interpolationScheme cellPointFace;

fields
(
    U
);

sets
(
);

surfaces
(
   
plane11
  
 {
     
type   plane;

     basePoint    (0.0 0.0 0.6);  
     normalVector (0 0.0000001 0.1);
     interpolate true; 
}
);

if I use (0 0 0.1 ) instead of (0 0.00000001 0.1) for normal vector , when I run "sample" it make folder but all folders are empty !!!

what you think?

[wyldckat]

Greetings Amin,

Mmm... not much information to go on, but my guess is that you're trying to get a sample right on top of a wall or patch. I think "sampleDict" can sample a patch directly. You can find a complete example here:

$WM_PROJECT_DIR/applications/utilities/postProcessing/sampling/sample/sampleDict

To know what value "$WM_PROJECT_DIR" has:

echo $WM_PROJECT_DIR

Best regards,
Bruno

[amin144]

ThanX very much Dear Bruno
I checked it
It wasn,t the problem
I used patch which you said, it works correctly

0 0 .0000000000000000000000000000000000000000000000000 0000000000001 0 work
but 0 0 1 does'n work

[wyldckat]

Hi Amin,

Are you able to do a slice/cut on ParaView on that same plane (0 0 0.1)?

Best regards,
Bruno

[amin144]

Hi Bruno
yes Of course
My outlet patch normal vector is (0 0 .1)

[wyldckat]

Hi Amin,

I haven't answered back because I haven't had time to create a test case of my own.
If you could post a small example case, or give an example based on one of OpenFOAM's tutorials, it would be easier to diagnose what might be going on!

Best regards,
Bruno

[amin144]

I upload it for you
It's solver is icoFoam

[wyldckat]

Hi Amin,

Well, the problem apparently is because you're using a reaaally old version of OpenFOAM. I've used just now OpenFOAM 2.1.x, 2.0.x and 1.7.x, all with success!

So the solution should be: upgrade your OpenFOAM version!

Best regards,
Bruno

[wyldckat]

Hi Amin,

Well, although this worked for me, it looks like that sometimes it doesn't work for other people as well. Here's such an example: http://www.openfoam.org/mantisbt/view.php?id=520

So, you might indeed need a slight offset to one direction in order to get a proper sampling when the lines/points are too close to a patch or wall.

Best regards,
Bruno

[amin144]

Hi Bruno
Tanx very much
You are absolutely right