[MachEpoch]

Hell everyone!
I would like to extract data near airfoil for particular study rather than to work on full domain data because it is too much resource consuming. Can you help me with any function present in openfoam for this particular task or in paraview.

[Yann]

Hello,

In ParaView you can use the clip filter, with a "clip type: box" for instance to clip your domain and keep only the part you want to work with.

Cheers,
Yann

[olesen]

Originally Posted by MachEpoch

Hell everyone!
I would like to extract data near airfoil for particular study rather than to work on full domain data because it is too much resource consuming. Can you help me with any function present in openfoam for this particular task or in paraview.

One option would be to specify the restricted region and generate output files during the simulation. Would normally recommend the ensightWrite functionObject (for small output sizes with a static mesh), but the vtkWrite functionObject would work equally well.


If you check the documentation of ensightWrite, you will see that it supports a geometric selection mechanism:

        selection 
        { 
            box 
            { 
                action  use; 
                source  box; 
                box     (-0.1 -0.01 -0.1) (0.1 0.30 0.1); 
            } 
            dome 
            { 
                action  add; 
                shape   sphere; 
                origin  (-0.1 -0.01 -0.1); 
                radius  0.25; 
            } 
            centre 
            { 
                action  subtract; 
                source  sphere; 
                origin  (-0.1 -0.01 -0.1); 
                radius  0.1; 
            } 
            blob 
            { 
                action  add; 
                source  surface; 
                surface triSurfaceMesh; 
                name    blob.stl; 
            }

        }

Since these are also very much like topoSet, you can add/subset cellZones, cellSets etc.
With these functionObjects, you can specify which fields you wish to output as well.

[MachEpoch]

Originally Posted by Yann

Hello,

In ParaView you can use the clip filter, with a "clip type: box" for instance to clip your domain and keep only the part you want to work with.

Cheers,
Yann

Thank You Yann, I got the desired result through this first applying clip then slice over it. Now I am trying get the data of every snapshot in one csv file , do you know any command for that or we have to write a python script?

[MachEpoch]

Originally Posted by olesen

One option would be to specify the restricted region and generate output files during the simulation. Would normally recommend the ensightWrite functionObject (for small output sizes with a static mesh), but the vtkWrite functionObject would work equally well.


If you check the documentation of ensightWrite, you will see that it supports a geometric selection mechanism:

        selection 
        { 
            box 
            { 
                action  use; 
                source  box; 
                box     (-0.1 -0.01 -0.1) (0.1 0.30 0.1); 
            } 
            dome 
            { 
                action  add; 
                shape   sphere; 
                origin  (-0.1 -0.01 -0.1); 
                radius  0.25; 
            } 
            centre 
            { 
                action  subtract; 
                source  sphere; 
                origin  (-0.1 -0.01 -0.1); 
                radius  0.1; 
            } 
            blob 
            { 
                action  add; 
                source  surface; 
                surface triSurfaceMesh; 
                name    blob.stl; 
            }

        }

Since these are also very much like topoSet, you can add/subset cellZones, cellSets etc.
With these functionObjects, you can specify which fields you wish to output as well.

Thanks, I tried vtkWrite for this. I got some result butI was unable to verify that i am choosing correct region for my study. i am still looking over this. thanks for suggestion.