CFD Online Discussion Forums - Have only process 0 write data

Hi Foamers,

In my calculation using pisoFoam solver, I need to write a variable at each time step. This is done through adding the following line to pisoFoam solver:

Code:

word patchName = "inlet";

label patchID = mesh.boundary().findPatchID(patchName);    

   

  IOField<vector> U2

(

    IOobject

    (

        "U",

        mesh.time().constant(),

        "boundaryData/inlet"/runTime.timeName(),

        mesh,

        IOobject::NO_READ,

        IOobject::NO_WRITE

    ),

    U.boundaryField()[ patchID ]

);



U2.write();

This block makes the solver to write the velocity boundary data for inlet bc.
The number of time steps is very huge! So many many files are generated.

The problem is that when I decompose my case to run in parallel mode, every process generates its own files while I only want process 0 to write data into file. Now this is my question:

How can I have only process 0 to write data into files and exclude the other processes?!

Thanks
Syavash