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What is the difference between "includefunc residuals" and the residuals in log-file? |
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July 13, 2018, 12:40 |
What is the difference between "includefunc residuals" and the residuals in log-file?
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#1 |
Member
Bruno
Join Date: Jun 2016
Location: Siegen, Germany
Posts: 59
Rep Power: 9 |
Hi,
I'm trying to run an inviscid, incompressible flow (Euler equations) around a wing with simpleFoam with nu set to zero. I'm trying to judge convergence and noticed that the final residuals in the log-file (by running simpleFoam > log) are in the order of e-09, whereas the residuals in the .dat file generated with "includefunc residuals" are in the order of e-02. What is the difference between the two? Why are they not the same? Here's the last log entry: Code:
Time = 3000 DILUPBiCG: Solving for Ux, Initial residual = 0.00244323, Final residual = 6.17655e-10, No Iterations 8 DILUPBiCG: Solving for Uy, Initial residual = 0.0121557, Final residual = 7.31898e-09, No Iterations 7 DILUPBiCG: Solving for Uz, Initial residual = 0.00547038, Final residual = 2.36399e-09, No Iterations 8 DICPCG: Solving for p, Initial residual = 0.0347422, Final residual = 8.60062e-07, No Iterations 75 time step continuity errors : sum local = 2.02144e-08, global = -2.11615e-09, cumulative = -2.57245e-07 ExecutionTime = 235.96 s ClockTime = 236 s End Code:
# Time p Ux Uy Uz 3000 3.474220e-02 2.443230e-03 1.215570e-02 5.470380e-03 Bruno |
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July 13, 2018, 18:29 |
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#2 |
Senior Member
Join Date: Aug 2015
Posts: 494
Rep Power: 14 |
It looks like the initial residuals are those pulled by the function, not the final ones.
Caelan |
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July 16, 2018, 09:57 |
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#3 |
Member
Bruno
Join Date: Jun 2016
Location: Siegen, Germany
Posts: 59
Rep Power: 9 |
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