turbulentDigitalFilterInlet makes pattern of the turbulent structures running in parallel

Summary

turbulentDigitalFilterInlet makes a pattern of the turbulent structures which follow the partitioning of the domain decomposition using DFM and FSM modes.

Steps to reproduce

Using the tutorial

cp -r $FOAM_TUTORIALS/tutorials/verificationAndValidation/turbulentInflow/oneCellThickPlaneChannel .

Run in serial mode

vi Allrun

    # flag to enable computations in parallel mode
    parallel=false

Plot the resulting velocity field magnitude using Paraview
Change the number of processors to 9, and change the partition method to serial with 3x3 partitions in y and z directions

vi setups.orig/common/system/decomposeParDict

numberOfSubdomains  9;
method              simple;
simpleCoeffs
{
   n (1 3 3);
}

Run for only one time-step, as the partitioning makes the simulation unstable.

vi setups.orig/common/system/controlDict

stopAt          writeNow;

Run in parallel mode

mv results results_serial
vi Allrun

    # flag to enable computations in parallel mode
    parallel=true

Plot the resulting velocity field magnitude using Paraview

Example case

See above

What is the current bug behaviour?

The results when running in parallel or serial modes is different using DFM and FSM. A pattern of the turbulent structures follows the partitioning of the domain decomposition.