[lf.lopez18]

Hi all


I was exporting some Lagrangian data in OpenFOAM v8 and I wanted to use the position of a particle to initialize another simulation. However, I can't understand the format. The "positions" file shows something like this:

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  8
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       Cloud<passiveParticle>;
    location    "0.056/lagrangian/kinematicCloud";
    object      positions;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

1
(
(0.214858 0.231858 0.160714 0.392571) 3838 7620 1
)


// ************************************************************************* //

Could someone please explain me what does every number represents? And if you know, which source file reads or writes the "positions" file?.


Best regards,
Felipe.

[olesen]

Good luck with that unless you wish to reconstruct your entire mesh information first.

[riefler]

Hi Felipe,


did you find a solution to convert the positions into Cartesian values? And where are the diameters of the particles?


Best,
Norbert

[joshwilliams]

This is a common problem with several threads. The most useful one is here I think.
You need to run the functionObject from this GitHub repo to convert from Barycentric to cartesian coordinates.