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Probe Warning, Probe Does Not Work

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Old   October 4, 2013, 11:37
Default Probe Warning, Probe Does Not Work
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Greetings people,

I am running a case, with parallel computing, and before the computations I got this warning message:

Code:
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.03 0.11 0) in any cell. Skipping location.
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.03 0.11125 0) in any cell. Skipping location.
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.03 0.1125 0) in any cell. Skipping location.
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.03 0.1225 0) in any cell. Skipping location.
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.04 0.12375 0) in any cell. Skipping location.
--> FOAM Warning :
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.0475 0.1275 0) in any cell. Skipping location.
I did not got any error with the checkMesh, and as I checked the probes are not outside the domain. I read on other thread (I do not remember the link) that while decomposing it might appear some problems. So I run the case in a single processor, and got the same warning, but only in one probe, the warning message is:

Code:
--> FOAM Warning : 
    From function probes::read()
    in file probes/probes.C at line 71
    Did not find location (0.0475 0.1275 0) in any cell. Skipping location.
So, does anyone know what is the problem ?
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Old   October 5, 2013, 14:49
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Nima Samkhaniani
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checkMesh and see whether your mesh is in domain or not
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Old   October 14, 2013, 07:04
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As I said (and confirmed), the probes are in the domain. If I DO NOT decompose the problem, i. e. run the simulation in only one processor, OpenFOAM still gives me one warning. Is there any problems between decomposing the mesh and probe locations ? And why I get the warning, if the probe is in the domain ?
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Old   April 10, 2014, 09:41
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rather than using a probe functionObject try a polyLine set where the original probeLocations are now the points.
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Old   April 10, 2014, 09:54
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Hi,

actually warning are self-explanatory

Code:
Did not find location (0.03 0.1225 0) in any cell. Skipping location.
For example in the warning it tries to tell you that a probe (0.03 0.1225 0) is outside of the mesh. And surely if a probe is outside of the mesh, there's nothing to probe.

Check dimensions of the mesh, check where you put your probes. Try to put all the probes inside the mesh.
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Old   April 10, 2014, 11:45
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sure alexeym, but I have noticed the probe functionObject having trouble locating points that are inside a mesh when running in parallel. There are slight differences in the implementation of the particular findCell() function for probes, polyLines, clouds, etc. and in my experience, there are some bugs.
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Old   April 10, 2014, 12:27
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Oh, sorry, missed several messages.

Does the number of warnings depend on the decomposition (number of subdomains, decomposition method)? Maybe probes are on processor boundaries (though in this case another warning should be issued)?

I've looked though the implementation of findCell method and wasn't able to find anything that won't be working in parallel cases.
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Old   April 11, 2014, 13:38
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I've attached a case where I noticed this happening. The controlDict has functionObjects that write out velocity and pressure at 120 locations inside the domain at each iteration, once using type probes from libsampling and once using type sets with polyLine. The polyLine method works fine, but the probes approach skips four locations. Just use Allrun - hopefully it's self-explanatory.

If you get to the bottom of that and are still motivated, check out http://www.openfoam.org/mantisbt/view.php?id=0001147 for a another sampling peculiarity.
Attached Files
File Type: gz probeTest.tar.gz (6.5 KB, 90 views)
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Old   April 14, 2014, 03:38
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Hi,

unfortunately I wasn't able to reproduce the error, here is the output of the solver for the attached case:

Code:
Build  : 2.2.2-9739c53ec43f
Exec   : simpleFoam -parallel
...
SIMPLE: convergence criteria
    field p      tolerance 0.001
    field U      tolerance 0.0001
    field "(k|epsilon)"  tolerance 0.0001


Starting time loop

Reading set description:
    polyLine

Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.0762530558, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 0.69705505, Final residual = 0.651831039, No Iterations 1000
smoothSolver:  Solving for Uz, Initial residual = 1, Final residual = 0.0752473553, No Iterations 1
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0835314711, No Iterations 2
time step continuity errors : sum local = 1.10938559e-16, global = -3.04128912e-18, cumulative = -3.04128912e-18
smoothSolver:  Solving for epsilon, Initial residual = 0.999999992, Final residual = 0.0309136051, No Iterations 2
smoothSolver:  Solving for k, Initial residual = 0.999999991, Final residual = 0.0339960612, No Iterations 2
...
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Old   April 16, 2014, 05:01
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thanks for trying that out. I noticed from your output log that you are running 2.2.2. I had been running 2.3.x. I've built 2.2.x again and tested the same case - my output is now just like yours - no errors. If you (or anyone else) have 2.3.x available, I'd be interested in how that works for you. In the meantime though, I'll submit a bug report when I have an opportunity.
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Old   April 18, 2014, 16:03
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I'd like to confirm that bug can be reproduced with 2.3.x.

There was certain changes in findCell algorithm between 2.2.2 and 2.3.x though I wasn't able yet to determine the reason why everything is OK under 2.2.2 and not OK under 2.3.x (though I guess the reason is tetrahedral cells near the probes as mainly the algorithm was changed for tetrahedral mesh).
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Old   February 20, 2015, 06:48
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hello!

I can also confirm the bug. I'm using version 2.3.0 and for a list of 45 points which clearly ly within the domain 8 are not found. If I use the sample application the same error accures. Did somebody find a solution for the problem?
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Old   September 5, 2017, 13:21
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Hi, I'm facing a similar issue in OpenFOAM 4.1. Did someone file a bug report?
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Old   September 19, 2017, 05:13
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Hei hei I used also version 3.0+ and there I do not have any problems to find the probes
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