interDyMFoam: 0 split points out of a possible 0

Elham · October 16, 2015, 01:24

Hi,

I run interDyMFoam in parallel and the speed of the simulation is too low. I have got the following commands in Terminal:

Selected 0 split points out of a possible 0.
MULES: Solving for alpha.water
MULES: Solving for alpha.water
MULES: Solving for alpha.water
Phase-1 volume fraction = 2.111971e-05 Min(alpha1) = -9.115508e-11 Max(alpha1) = 0.9973917
GAMG: Solving for p_rgh, Initial residual = 0.1724118, Final residual = 0.0001625687, No Iterations 14
time step continuity errors : sum local = 8.833984e-08, global = -9.787229e-13, cumulative = -6.119188e-09
GAMG: Solving for p_rgh, Initial residual = 0.0005972664, Final residual = 9.553637e-07, No Iterations 152
time step continuity errors : sum local = 5.05861e-10, global = -3.284247e-14, cumulative = -6.119221e-09
ExecutionTime = 71870.98 s ClockTime = 72155 s

I am a bit suspicious about the sentence :"Selected 0 split points out of a possible 0."

Is there any comment for it?

Thanks

nimasam · October 18, 2015, 07:16

dont worry, it says no cell is selected for refinement

kk415 · October 29, 2019, 06:11

Hello Foamers

I am solving a static bubble problem as the interface is stationary I am getting the following oscillation of grid refinement in my problem.

Courant Number mean: 0.000412997 max: 0.00743201
Interface Courant Number mean: 0.00014211 max: 0.00743201
deltaT = 0.0075
Selected 8 cells for refinement out of 1640.
Refined from 1640 to 1696 cells.
Selected 0 split points out of a possible 96.
Execution time for Level Set Mesh Update = 0.01 s
Defining the group of the cells
Time = 0.9

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.121094 Min(alpha.water) = 6.04327e-97 Max(alpha.water) = 1
solve the reinitialization equation
Interpolation of psi from coarser to finer mesh
Solve the modified reinitialization equation in finer mesh
Interpolation from finer to coarser mesh

DICPCG: Solving for p_rgh, Initial residual = 0.0625893, Final residual = 9.72881e-09, No Iterations 43
time step continuity errors : sum local = 1.38529e-12, global = -9.95595e-22, cumulative = -3.9015e-21
ExecutionTime = 1.76 s ClockTime = 1 s

Courant Number mean: 0.00040352 max: 0.00737728
Interface Courant Number mean: 0.000140431 max: 0.00737728
deltaT = 0.0075
Selected 0 cells for refinement out of 1696.
Selected 8 split points out of a possible 96.
Unrefined from 1696 to 1640 cells.
Execution time for Level Set Mesh Update = 0.01 s
Defining the group of the cells
Time = 0.9075

how can I resolve this issue ?

October 16, 2015, 01:24	interDyMFoam: 0 split points out of a possible 0	#1
Elham Senior Member Elham Join Date: Oct 2009 Posts: 184 Rep Power: 17	Hi, I run interDyMFoam in parallel and the speed of the simulation is too low. I have got the following commands in Terminal: Selected 0 split points out of a possible 0. MULES: Solving for alpha.water MULES: Solving for alpha.water MULES: Solving for alpha.water Phase-1 volume fraction = 2.111971e-05 Min(alpha1) = -9.115508e-11 Max(alpha1) = 0.9973917 GAMG: Solving for p_rgh, Initial residual = 0.1724118, Final residual = 0.0001625687, No Iterations 14 time step continuity errors : sum local = 8.833984e-08, global = -9.787229e-13, cumulative = -6.119188e-09 GAMG: Solving for p_rgh, Initial residual = 0.0005972664, Final residual = 9.553637e-07, No Iterations 152 time step continuity errors : sum local = 5.05861e-10, global = -3.284247e-14, cumulative = -6.119221e-09 ExecutionTime = 71870.98 s ClockTime = 72155 s I am a bit suspicious about the sentence :"Selected 0 split points out of a possible 0." Is there any comment for it? Thanks

October 18, 2015, 07:16		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	dont worry, it says no cell is selected for refinement Elham likes this. __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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October 29, 2019, 06:11		#3
kk415 Senior Member krishna kant Join Date: Feb 2016 Location: Hyderabad, India Posts: 133 Rep Power: 10	Hello Foamers I am solving a static bubble problem as the interface is stationary I am getting the following oscillation of grid refinement in my problem. Courant Number mean: 0.000412997 max: 0.00743201 Interface Courant Number mean: 0.00014211 max: 0.00743201 deltaT = 0.0075 Selected 8 cells for refinement out of 1640. Refined from 1640 to 1696 cells. Selected 0 split points out of a possible 96. Execution time for Level Set Mesh Update = 0.01 s Defining the group of the cells Time = 0.9 PIMPLE: iteration 1 MULES: Solving for alpha.water Phase-1 volume fraction = 0.121094 Min(alpha.water) = 6.04327e-97 Max(alpha.water) = 1 solve the reinitialization equation Interpolation of psi from coarser to finer mesh Solve the modified reinitialization equation in finer mesh Interpolation from finer to coarser mesh DICPCG: Solving for p_rgh, Initial residual = 0.0625893, Final residual = 9.72881e-09, No Iterations 43 time step continuity errors : sum local = 1.38529e-12, global = -9.95595e-22, cumulative = -3.9015e-21 ExecutionTime = 1.76 s ClockTime = 1 s Courant Number mean: 0.00040352 max: 0.00737728 Interface Courant Number mean: 0.000140431 max: 0.00737728 deltaT = 0.0075 Selected 0 cells for refinement out of 1696. Selected 8 split points out of a possible 96. Unrefined from 1696 to 1640 cells. Execution time for Level Set Mesh Update = 0.01 s Defining the group of the cells Time = 0.9075 how can I resolve this issue ?