[sippanspojk]

Hi foamers,

I am adapting a code I wrote to work in parallel and I have some basic problems.

First of all, I don't understand what the reduce command is doing. Scatter and Gather I think I understand more or less; scatter divides my information and spread it on my procs and gather collects the information and assemble it on my master proc, correct? But reduce however I have no clue of what this is doing. Can someone help me here?



In my code I am reading the pressure values of each face of some specified patches, doing some computations using those values and then finally updating a custom defined scalarField.

I was then thinking that I should to do the following: gather the pressure field, read the pressure values, perform my computations, update my custom filed and lastly scatter the custom field before the next time step is taken. Is this correct?


I am really fumbling in the dark here so any kind of clarification would be very much appreciated.

Thanks,
David