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What happened to the sample utility in OpenFOAM 6?

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Old   November 30, 2018, 05:41
Default What happened to the sample utility in OpenFOAM 6?
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Sam Appleby
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It was simple, it was clear, you could specify a line or a surface in sampleDict to sample values and integrate or average or do whatever else you wanted. I must be going blind because the new user guide says nothing about how you can define a line to integrate a field over with the postProcess utility. It tells you how to specify a patch for calculations, but not how to define a line or a surface, this is ridiculous.
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Old   December 4, 2018, 03:36
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How about this page: https://cfd.direct/openfoam/user-gui...hs-monitoring/ , is this what you are looking for? To sample a surface you use the surfaces dictionary and multiple graphs can be done with the graph dict.
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Old   December 6, 2018, 07:23
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Sam Appleby
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Ah, you're right I missed that. Thank you.
Another question, what about flow rate calculation? The user guide introduces function objects that can calculate the flow rate, but those all require a patch name, what if you want to calculate the flow rate through a random surface? Is there a way simpler than sampling the values on that surface and exporting to a software like Matlab?
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Old   May 29, 2019, 22:23
Default How to transform the sample surface on a structured 2D grid
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I am wondering if it is possible to interpolate data on a sample surface to map it on a rectangular 2D grid.

Let us say I have a case with an unstructured grid and I get data on a slice at x=a. Since I want to do some math such as FFT on that group of data on that slice, I need to map data on a structured, ordered m*n grid. I it possible to perform such a task by openfoam or paraview?

Thanks in advance.
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Old   March 30, 2020, 12:55
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Hi,
I am using openFoam V6. Kindly, can we still use sampleDict for V6?
I tried to run PostProcess -func sampleDict -latestTime, I get empty directories.
I would appreciate any assistance. Thanks
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Old   March 30, 2020, 18:47
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Hi,
Does that mean we cannot use sampleDic for openfoam v6?
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Old   April 2, 2020, 16:55
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`sample` functionalities can be used in OpenFOAM as before. I think the dictionary examples were just forgotten.

Put your `sampleDict`, or any file containing your `sample` setup, and try to run `postProcess -dict system/sampleDict -latestTime`, or if you have the sample setup in your `controlDict:functions`, just `postProcess -latestTime` will execute the `sample` dictionary.
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Old   August 20, 2020, 07:36
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Dear all,
I have some kind of sampling problem when I use cloud type. I need to sample mag(U) at several points and followed to the sampling tutorial https://www.cfd.at/sites/default/fil...leFourteen.pdf. After execution of the command - postProcess -func sample –latestTime, I got an error - Unknown sample set type cloud. Please help me to clarify this issue. Where I have made mistake?
Please see the attached file for more information.
I am using OpenFOAM7.0 installed on Ubuntu 18.04 LTS.
Kerim
Attached Files
File Type: txt Allrunpost.txt (286 Bytes, 3 views)
File Type: txt Allrunpostlog.txt (1.8 KB, 2 views)
File Type: txt controlDict.txt (1.4 KB, 12 views)
File Type: txt sample.txt (3.7 KB, 43 views)
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Old   September 30, 2020, 04:10
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Quote:
Originally Posted by kerim View Post
Dear all,
I have some kind of sampling problem when I use cloud type. I need to sample mag(U) at several points and followed to the sampling tutorial https://www.cfd.at/sites/default/fil...leFourteen.pdf. After execution of the command - postProcess -func sample –latestTime, I got an error - Unknown sample set type cloud. Please help me to clarify this issue. Where I have made mistake?
Please see the attached file for more information.
I am using OpenFOAM7.0 installed on Ubuntu 18.04 LTS.
Kerim
Hi kerim,

Have you found a solution? I have exactly the same problem right now.
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Old   September 30, 2020, 17:07
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abdikerim kurbanaliev
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Quote:
Originally Posted by CFD-HSNR View Post
Hi kerim,

Have you found a solution? I have exactly the same problem right now.

Please look at this file - points.H

You can find it in the OpenFoam installation folder:

openfoam/src/sampling/sampledSet/points.H
Kerim.


PS. Please have a critical look at User Guide. There are some wrong statements!
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