[fferroni]

Hello everyone,

I'm trying to plot velocity magnitude fluctuations at a point, for thousands of time-steps, and then export them, fourier transform etc.

In paraview, I am aware that there is a 'plot over time' function. I select a point. However, I cannot seem to be able to plot velocity, only post-processed values like vorticity. Any ideas? I also tried using beforehand a cell-to-point filter but still no luck.

Thank you in advance!!!! I'm sure someone has done this before, because I can't think of many other ways to estimate fluctuation frequency...

Best Regards,

Francesco

[amin144]

Originally Posted by fferroni

Hello everyone,

I'm trying to plot velocity magnitude fluctuations at a point, for thousands of time-steps, and then export them, fourier transform etc.

In paraview, I am aware that there is a 'plot over time' function. I select a point. However, I cannot seem to be able to plot velocity, only post-processed values like vorticity. Any ideas? I also tried using beforehand a cell-to-point filter but still no luck.

Thank you in advance!!!! I'm sure someone has done this before, because I can't think of many other ways to estimate fluctuation frequency...

Best Regards,

Francesco

Hi
Could you explain me more
can you plot velocity over time or your problem is only about vorticity?

[gschaider]

Originally Posted by fferroni

Hello everyone,

I'm trying to plot velocity magnitude fluctuations at a point, for thousands of time-steps, and then export them, fourier transform etc.

In paraview, I am aware that there is a 'plot over time' function. I select a point. However, I cannot seem to be able to plot velocity, only post-processed values like vorticity. Any ideas? I also tried using beforehand a cell-to-point filter but still no luck.

Thank you in advance!!!! I'm sure someone has done this before, because I can't think of many other ways to estimate fluctuation frequency...

Best Regards,

Francesco

What you're looking for is the probes functionObject. Searching for these two keywords you should find sufficient information

[fferroni]

Indeed.

For reference to others, to extract probe data over time-steps after simulations:

Add a probesDict file to your system folder ( https://unihub.ru/tools/ofservice/br...bes/probesDict ) and run 'probeLocations'

Thank you!!

[gschaider]

Originally Posted by fferroni

Indeed.

It's not that hard to find once you know the nomenclature, isn't it?

Originally Posted by fferroni

For reference to others, to extract probe data over time-steps after simulations:

Add a probesDict file to your system folder ( https://unihub.ru/tools/ofservice/br...bes/probesDict ) and run 'probeLocations'

Thank you!!

Would an entry in http://openfoamwiki.net/index.php/Ma...Postprocessing have helped you? In that case it would be nice if you wrote one

[Ahmed Khattab]

Originally Posted by fferroni

Indeed.

For reference to others, to extract probe data over time-steps after simulations:

Add a probesDict file to your system folder ( https://unihub.ru/tools/ofservice/br...bes/probesDict ) and run 'probeLocations'

Thank you!!

Hi,

i vave tried this method but that is only i got

Create time

Create mesh for time = 0

Time = 0

Time = 1

Time = 2

Time = 3

Time = 4

Time = 5

Time = 6

Time = 7

Time = 8

Time = 9

Time = 10

Time = 11

Time = 12

Time = 13

Time = 14

Time = 15

Time = 16

Time = 17

Time = 18

Time = 19

Time = 20

Time = 21

Time = 22

Time = 23

Time = 24

Time = 25

Time = 26

Time = 27

Time = 28

Time = 29

Time = 30

Time = 31

Time = 32

Time = 33

Time = 34

Time = 35

Time = 36

Time = 37

Time = 38

Time = 39

Time = 40

Time = 41

Time = 42

Time = 43

Time = 44

Time = 45

Time = 46

Time = 47

Time = 48

Time = 49

Time = 50

Time = 51

Time = 52

Time = 53

Time = 54

Time = 55

Time = 56

Time = 57

Time = 58

Time = 59

Time = 60

Time = 61

Time = 62

Time = 63

Time = 64

Time = 65

Time = 66

Time = 67

Time = 68

Time = 69

Time = 70

Time = 71

Time = 72

Time = 73

Time = 74

Time = 75

Time = 76

Time = 77

Time = 78

Time = 79

Time = 80

Time = 81

Time = 82

Time = 83

Time = 84

Time = 85

Time = 86

Time = 87

Time = 88

Time = 89

Time = 90

Time = 91

Time = 92

Time = 93

Time = 94

Time = 95

Time = 96

Time = 97

Time = 98

Time = 99

Time = 100

End

no values displayed.

my probesDict file is:

    /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  2.0.1                                 |
    |   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     2.0;
        format      ascii;
        class       dictionary;
        object      probesDict;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    // Fields to be probed. runTime modifiable!
    fields
    (
        u
    );
    
    // Locations to be probed. runTime modifiable!
    probeLocations
    (
        (0   0.5 0.0)
            (0.2 0.5 0.0)
            (0.4 0.5 0.0)
            (0.6 0.5 0.0)
            (0.8 0.5 0.0)
            (1.0 0.5 0.0)

    );
    
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

thanks in advance.

[gschaider]

Originally Posted by rebel ahmed

Hi,

i vave tried this method but that is only i got

Create time

Create mesh for time = 0

Time = 0

....

Time = 100

End

no values displayed.

Is better. Use "ls" and look for the saved data

[eysteinn]

Originally Posted by rebel ahmed

my probesDict file is:

    /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  2.0.1                                 |
    |   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     2.0;
        format      ascii;
        class       dictionary;
        object      probesDict;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    // Fields to be probed. runTime modifiable!
    fields
    (
        u
    );
    
    // Locations to be probed. runTime modifiable!
    probeLocations
    (
        (0   0.5 0.0)
            (0.2 0.5 0.0)
            (0.4 0.5 0.0)
            (0.6 0.5 0.0)
            (0.8 0.5 0.0)
            (1.0 0.5 0.0)

    );
    
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Hi,
I think replacing u with U, for velocity, will do the trick!
followed then by the ls probes trick

/Eysteinn