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-   -   Can anybody explain my log file (http://www.cfd-online.com/Forums/openfoam/82817-can-anybody-explain-my-log-file.html)

gandesk December 7, 2010 00:45

Can anybody explain my log file
 
I am using InterFoam for my case to track interface between air and a fluid. I have defined my time step as 0.00001 sec. But in the log file I could not find any where this time step. Could anyone please explain me the calculation process adopted by OpenFoam for solving my case. I am not goot at C++ coding and finding tough time to understand the ternminology. Please look at my log file below:

Courant Number mean: 0.000858798 max: 0.467166
deltaT = 4.54545e-05
Time = 4.54545e-05
MULES: Solving for gamma
Liquid phase volume fraction = 0.00100215 Min(gamma) = 0 Max(gamma) = 1
MULES: Solving for gamma
Liquid phase volume fraction = 0.00100215 Min(gamma) = 0 Max(gamma) = 1
DICPCG: Solving for pd, Initial residual = 1, Final residual = 0.0498366, No Iterations 14
DICPCG: Solving for pd, Initial residual = 0.00660154, Final residual = 0.000313121, No Iterations 88
DICPCG: Solving for pd, Initial residual = 0.00359337, Final residual = 9.49349e-08, No Iterations 258
time step continuity errors : sum local = 7.03276e-10, global = -4.4511e-12, cumulative = -4.45109e-12
ExecutionTime = 8.59 s ClockTime = 12 s
Courant Number mean: 0.00152963 max: 3.92326
deltaT = 5.75374e-06
Time = 5.12083e-05
MULES: Solving for gamma
Liquid phase volume fraction = 0.00100215 Min(gamma) = 0 Max(gamma) = 1
MULES: Solving for gamma
Liquid phase volume fraction = 0.00100215 Min(gamma) = 0 Max(gamma) = 1
DICPCG: Solving for pd, Initial residual = 0.0994367, Final residual = 0.00347591, No Iterations 10
DICPCG: Solving for pd, Initial residual = 0.00420006, Final residual = 0.000189103, No Iterations 9
DICPCG: Solving for pd, Initial residual = 0.000579272, Final residual = 9.65273e-08, No Iterations 223
time step continuity errors : sum local = 1.83072e-10, global = -4.23804e-12, cumulative = -8.68914e-12
ExecutionTime = 12 s ClockTime = 16 s

MartinB December 7, 2010 03:15

Hi,

you must disable the adjustTimeStep option in "system/controlDict":
Code:

adjustTimeStep  no;
Otherwise the max courant number limits the time step.

Martin


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