Extract nodal values
 

Hello,

Just a quick question. Is it possible to get field values from the nodes of a cell in openfoam or does one just get values from the cell face or boundary patch?

Thanks.

Hi,
Not sure what you meant! I came across a piece of code which might do this job:

forAll( mesh.C(), i )
fout << mesh.C()[i][0] << " " << x[i] << "\n"

Hi,

Can you give me a link to the code, I suspect that there are more information that I need.

Regards

Hi,
did you find a solution to get the field values from the nodes?


Regards,
Cenk

I was not able to do it in OpenFOAM. However, I am partially successful doing it in ParaView. This post might help - https://www.paraview.org/Wiki/Data_Selection

I think I had this problem a while ago. You mean getting the values from the control volume's center? You can write the cell center coordinates to files at a given timestep "t":
Just substitute t by the timestep you want to write them to. Files C,Cx,Cy and Cz will be generated with the coordinates of the cell centers in that timestep's folder.

The cell coordinates are written in those files in the same order as the field files, so you just need to write a matlab or c script to search for the ones you want.


There might be an easier way to do this, but this method has worked out for me, so far.


Edit: if you mean the nodes of a cell's face, I don't think OF stores those, but you can probably interpolate them or use ParaView as amod_kumar suggested.