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Very large ClockTime deviation

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Old   March 3, 2021, 18:05
Default Very large ClockTime deviation
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OpenFOAM version: v1912


Solver: simpleFOAM



Issue:

Very large ClockTime deviation between runs

Longer explanation:

I am really struggling to understand why I can run the same solver a number of times and get so many different ClockTime between them.


I can get on one run:
Code:
Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.0702223, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver:  Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0524647, No Iterations 5
time step continuity errors : sum local = 0.00152781, global = 6.95405e-06, cumulative = 6.95405e-06
smoothSolver:  Solving for epsilon, Initial residual = 0.0515357, Final residual = 0.00306076, No Iterations 2
smoothSolver:  Solving for k, Initial residual = 1, Final residual = 0.0609778, No Iterations 2
ExecutionTime = 75.81 s  ClockTime = 77 s
and then another run immediately after

Code:
Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.0702223, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver:  Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0524647, No Iterations 5
time step continuity errors : sum local = 0.00152781, global = 6.95405e-06, cumulative = 6.95405e-06
smoothSolver:  Solving for epsilon, Initial residual = 0.0515357, Final residual = 0.00306076, No Iterations 2
smoothSolver:  Solving for k, Initial residual = 1, Final residual = 0.0609778, No Iterations 2
ExecutionTime = 1.99 s  ClockTime = 3 s

What could be the causing this?
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Tags
benchmarking, clocktime, parallel cluster, simplefoam, solver control

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