results are different between parallel and serial mode -- CFD Online Discussion Forums

February 23, 2022, 11:02

results are different between parallel and serial mode

ndtrong

Senior Member

Nguyen Duy Trong

Join Date: Apr 2014

Posts: 124

Rep Power: 12

Hi everyone,
Could you please help me to explain why the simulated results running in parallel and serial mode are different like this. The difference happens only in very short moment.
I am using the reduce function in OpenFOAM like this:

Code:

scalar position = 0.0e+00;
forAll(Patches, patchi)
{
   .... do something to compute....
}
reduce (position,maxOp<scalar>());
#include "writePos.H"

Attached Images

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