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I did a simulation with op1812 and MPPICInterFoam solver. I injected 550,000 parcels but more than 999M parcels stick to one of the boundaries. this is part of the log file:

Courant Number mean: 0.111537 max: 0.968023
Interface Courant Number mean: 0 max: 0
deltaT = 0.00666667
Time = 314.193

Evolving kinematicCloud

Solving 3-D cloud kinematicCloud
GAMG:  Solving for kinematicCloud:alpha, Initial residual = 0.0014182, Final residual = 0.00109688, No Iterations 1000
Cloud: kinematicCloud
    Current number of parcels       = 287167
    Current mass in system          = 1.57878e-10
    Linear momentum                 = (2.97358e-15 -1.83809e-15 1.12724e-14)
   |Linear momentum|                = 1.1802e-14
    Linear kinetic energy           = 6.06593e-16
    Injector model1:
      - parcels added               = 549986
      - mass introduced             = 3.02371e-10
    Parcel fate: system (number, mass)
      - escape                      = 262819, 1.44492e-10
    Parcel fate: patch WALL_IN (number, mass)
      - escape                      = 0, 0
      - stick                       = 0, 0
    Parcel fate: patch WALL_OUT (number, mass)
      - escape                      = 0, 0
      - stick                       = 0, 0
    Parcel fate: patch LUMEN_WALL (number, mass)
      - escape                      = 0, 0
      - stick                       = 944675672, 5.19376e-07
    Parcel fate: patch OUTLET (number, mass)
      - escape                      = 262819, 1.44483e-10
      - stick                       = 0, 0
    Parcel fate: patch INLET (number, mass)
      - escape                      = 0, 0
      - stick                       = 0, 0
    Min cell volume fraction        = 0
    Max cell volume fraction        = 2.13323e-05
    Min dense number of parcels     = 5.5605

Continous phase-1 volume fraction = 1  Min(alphac) = 0.999979  Max(alphac) = 1
PIMPLE: iteration 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.013389, Final residual = 0.0114096, No Iterations 100
Phase-1 volume fraction = 1  Min(alpha.water) = 1  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 1  Min(alpha.water) = 1  Max(alpha.water) = 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.0115916, Final residual = 0.0115598, No Iterations 100
Phase-1 volume fraction = 1  Min(alpha.water) = 1  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 1  Min(alpha.water) = 1  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 2.09388e-06, Final residual = 9.41566e-08, No Iterations 4
time step continuity errors : sum local = 5.14021e-11, global = -8.3902e-12, cumulative = -6.26016e-09
DICPCG:  Solving for p_rgh, Initial residual = 3.24005e-06, Final residual = 1.60079e-07, No Iterations 7
time step continuity errors : sum local = 8.73903e-11, global = -1.33005e-11, cumulative = -6.27346e-09
DICPCG:  Solving for p_rgh, Initial residual = 1.38674e-06, Final residual = 9.51116e-09, No Iterations 442
time step continuity errors : sum local = 5.19234e-12, global = 3.77542e-15, cumulative = -6.27346e-09
ExecutionTime = 40261.9 s  ClockTime = 40514 s

Courant Number mean: 0.111537 max: 0.968022
Interface Courant Number mean: 0 max: 0
deltaT = 0.00666667
Time = 314.2

I wanted to know if this bug solved in dev version or not.

Thanks in advance.

## Reattaching the author to the issue ticket: @rmn_990 ##