[ayushmorx]

Hello,

I am newbie to OpenFoam, and recently ran a case using pimpleFoam. The run was successful, but now I need to postprocess. I am trying to extract a single file with raw data of cell nodes, and the corresponding velocities. I initially tried using writeCellCenters, but it shows 92k+ data points, whereas, my U file only shows 88k+ data points. Clearly either I am missing either U data at nodes or I do not have access to coordinates of the corresponding U velocities. I tried using PyFoamConvertToCSV, but clearly I am doing something wrong and cannot extract the data, not that I understand PyFoam much either.

So my question is, how would I best extract the correct node coordinates and correct corresponding velocities in a single file in raw format(x y z u v w). I need the data in my lagrangian codes, as well as possibly plot the data in gnuplot or jplot.

[kera]

Hallo Ayush,

one quick question, have you tried using "sampleDict"?

hope this helps!

Regards,
Ricky

Originally Posted by ayushmorx

Hello,

I am newbie to OpenFoam, and recently ran a case using pimpleFoam. The run was successful, but now I need to postprocess. I am trying to extract a single file with raw data of cell nodes, and the corresponding velocities. I initially tried using writeCellCenters, but it shows 92k+ data points, whereas, my U file only shows 88k+ data points. Clearly either I am missing either U data at nodes or I do not have access to coordinates of the corresponding U velocities. I tried using PyFoamConvertToCSV, but clearly I am doing something wrong and cannot extract the data, not that I understand PyFoam much either.

So my question is, how would I best extract the correct node coordinates and correct corresponding velocities in a single file in raw format(x y z u v w). I need the data in my lagrangian codes, as well as possibly plot the data in gnuplot or jplot.

[ayushmorx]

Hello Ricky,

I tried that, but it seems I can only extract the information for a line or surface. Can I extract information for the whole volume too?

[kera]

Hallo Ayush,

My knowledge of OpenFOAM is rather limited, of course there may be more efficient ways to extract information for the whole volume, but as for now, if you wanna extract the field data at every data point, you can do it in paraView.

Step1: Open paraview and on the top right corner of the RenderView click on split vertical or horizontal.
Step 2: select the SpreadSheet View, Wollah! you have all the field data for the specified time/iteration
Step 3: save the data as CSV and from there you can work it out as you like.

If you find any other approach, would be glad to know about it

Regards,
Ricky

Originally Posted by ayushmorx

Hello Ricky,

I tried that, but it seems I can only extract the information for a line or surface. Can I extract information for the whole volume too?