# Can anybody explain my log file

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 December 7, 2010, 00:45 Can anybody explain my log file #1 Member   Sandeep Join Date: Jul 2010 Posts: 48 Rep Power: 9 Sponsored Links 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

 December 7, 2010, 03:15 #2 Senior Member   Martin Join Date: Oct 2009 Location: Aachen, Germany Posts: 253 Rep Power: 13 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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