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-   -   confusing point ! help me (http://www.cfd-online.com/Forums/openfoam/102256-confusing-point-help-me.html)

amin144 May 26, 2012 15:02

confusing point ! help me
 
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:

Code:

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 !!! :confused:

what you think?

wyldckat May 26, 2012 20:38

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:
Code:

$WM_PROJECT_DIR/applications/utilities/postProcessing/sampling/sample/sampleDict
To know what value "$WM_PROJECT_DIR" has:
Code:

echo $WM_PROJECT_DIR
Best regards,
Bruno

amin144 May 27, 2012 01:40

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 May 27, 2012 08:06

Hi Amin,

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

Best regards,
Bruno

amin144 May 27, 2012 11:47

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

wyldckat May 29, 2012 15:44

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 May 29, 2012 17:55

1 Attachment(s)
I upload it for you
It's solver is icoFoam

wyldckat May 30, 2012 14:25

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 June 8, 2012 16:23

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 June 8, 2012 17:24

Hi Bruno
Tanx very much
You are absolutely right


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