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Spilway - Dt becomes very small

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Old   June 8, 2016, 12:24
Talking Spilway - Dt becomes very small
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Ivan Daniel
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I am running a simulation of a spilway in OpenFOAM 2.1.0.
But I run with InterFoam, the solution doesn't converge.

FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application interFoam;

startFrom latestTime;

startTime 0;

stopAt endTime;

endTime 30;

deltaT 0.001;

writeControl adjustableRunTime;

writeInterval 0.05;

purgeWrite 0;

writeFormat ascii;

writePrecision 6;

writeCompression uncompressed;

timeFormat general;

timePrecision 6;

runTimeModifiable yes;

adjustTimeStep on;

maxCo 1;
maxAlphaCo 1;

maxDeltaT 1;

functions
{
#include "forceCoeffs"
}

************************************************** **************

Courant Number mean: 9.42647e+29 max: 1.18631e+37
Interface Courant Number mean: 1.40504e+29 max: 3.86991e+35
deltaT = 3.59664e-70
--> FOAM Warning :
From function Time:perator++()
in file db/Time/Time.C at line 1061
Increased the timePrecision from 8 to 9 to distinguish between timeNames at time 0.00126071
Time = 0.00126071193

PIMPLE: iteration 1
smoothSolver: Solving for alpha.water, Initial residual = 1.58718e-07, Final residual = 5.62181e-12, No Iterations 1
Phase-1 volume fraction = 0.425401 Min(alpha.water) = -0.12434 Max(alpha.water) = 1.41534
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.425401 Min(alpha.water) = -0.12434 Max(alpha.water) = 1.41534
DILUPBiCG: Solving for Ux, Initial residual = 0.999999, Final residual = 2.75158e-13, No Iterations 1
DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 9.96478e-14, No Iterations 1
DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = 0.0496977, No Iterations 9
time step continuity errors : sum local = 5.98339e-09, global = -1.08509e-24, cumulative = 3.33729e+12
DICPCG: Solving for p_rgh, Initial residual = 8.91644e-08, Final residual = 8.91644e-08, No Iterations 0
time step continuity errors : sum local = 1.31943e+17, global = 0.156645, cumulative = 3.33729e+12
DICPCG: Solving for p_rgh, Initial residual = 8.91798e-08, Final residual = 8.91798e-08, No Iterations 0
time step continuity errors : sum local = 1.31966e+17, global = -1.12582, cumulative = 3.33729e+12


I don't think the problem is the mesh, because I believe I did well.


I'm practicing an example of this page: https://www.hpc.ntnu.no/display/hpc/...llway+Tutorial , but for me it doesn't work, can be the version of OpenFOAM.
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