# what is the meaning of this?!??!!?

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 October 5, 2012, 12:21 what is the meaning of this?!??!!? #1 Senior Member     Mostafa Mahmoudi Join Date: Jan 2012 Posts: 319 Rep Power: 8 Hi everybody I'm modeling a rotating square between water and air. when I run my model, the following messages appeared in my terminal: Code: ```solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 0.0827406 transformation: ((0 0 0) (-0.856565 (0 0 0.51604))) Execution time for mesh.update() = 0.05 s time step continuity errors : sum local = 5.19359e-14, global = 1.91199e-15, cumulative = 1.45354e-06 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 3.28882e-06, No Iterations 9 time step continuity errors : sum local = 3.27857e-15, global = -4.81172e-17, cumulative = 1.45354e-06 MULES: Solving for alpha1 Liquid phase volume fraction = 0.129117 Min(alpha1) = -3.3351e-36 Max(alpha1) = 0.999977 MULES: Solving for alpha1 Liquid phase volume fraction = 0.129169 Min(alpha1) = -3.33127e-36 Max(alpha1) = 0.999977 MULES: Solving for alpha1 Liquid phase volume fraction = 0.12922 Min(alpha1) = -3.32675e-36 Max(alpha1) = 0.999977 GAMG: Solving for p_rgh, Initial residual = 0.0226012, Final residual = 0.000126703, No Iterations 3 time step continuity errors : sum local = 1.35142e-09, global = 7.04088e-12, cumulative = 1.45355e-06 GAMGPCG: Solving for p_rgh, Initial residual = 0.00713841, Final residual = 5.44584e-09, No Iterations 6 time step continuity errors : sum local = 5.81134e-14, global = 2.97304e-16, cumulative = 1.45355e-06 smoothSolver: Solving for epsilon, Initial residual = 0.00084478, Final residual = 7.54014e-08, No Iterations 3 smoothSolver: Solving for k, Initial residual = 0.000782825, Final residual = 2.30447e-07, No Iterations 3 ExecutionTime = 305.2 s ClockTime = 306 s Interface Courant Number mean: 0.0379477 max: 0.490161 Courant Number mean: 0.248671 max: 0.499417 deltaT = 7.19143e-05 Time = 0.0828125 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 0.0828125 transformation: ((0 0 0) (-0.857728 (0 0 0.514103))) Execution time for mesh.update() = 0.04 s time step continuity errors : sum local = 5.86878e-14, global = 2.49004e-16, cumulative = 1.45355e-06``` can anybody help me? what is the meaning of this message: Code: `time step continuity errors : sum local = 5.86878e-14, global = 2.49004e-16, cumulative = 1.45355e-06` thank you

 October 6, 2012, 07:34 #2 Senior Member     ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 11 Hi I think sum local is absolute summation of continuty error in all CVs at present time step. global is summation of continuty error in all CVs at present time stem and cumulative is summation of global continuity errors from the first time step. adambarfi and yesaswi92 like this.

October 6, 2012, 12:25
#3
Senior Member

Mostafa Mahmoudi
Join Date: Jan 2012
Posts: 319
Rep Power: 8
Quote:
 Originally Posted by ata Hi I think sum local is absolute summation of continuty error in all CVs at present time step. global is summation of continuty error in all CVs at present time stem and cumulative is summation of global continuity errors from the first time step.
but does this error has any influence on my results? I think the answer is: No, It doesn't.

 October 6, 2012, 20:44 #4 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,910 Rep Power: 28 Yes, it does The solver reports the error for informative purposes, as a measure of how good your solution is. You want this error to be as close to machine precision as possible. adambarfi and yesaswi92 like this. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

October 8, 2012, 02:46
#5
Senior Member

Mostafa Mahmoudi
Join Date: Jan 2012
Posts: 319
Rep Power: 8
Quote:
 Originally Posted by alberto Yes, it does The solver reports the error for informative purposes, as a measure of how good your solution is. You want this error to be as close to machine precision as possible.
thank you Alberto,

but what do you think about the source of below error:
Code:
```DICPCG:  Solving for p, Initial residual = 1, Final residual = 6.72375e-08, No Iterations 62
time step continuity errors : sum local = 4.77002e+25, global = -9.93552e+15, cumulative = -9.93552e+15
Model mode 1
#0  Foam::error::printStack(Foam::Ostream&) in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#1  Foam::sigFpe::sigHandler(int) in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#2  Uninterpreted:
#3  Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#4  Foam::fvMatrix<Foam::SymmTensor<double> >::solve(Foam::dictionary const&) in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libviscoelasticTransportModels.so"
#5  Foam::fvMatrix<Foam::SymmTensor<double> >::solve() in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libviscoelasticTransportModels.so"
#6  Foam::Giesekus::correct() in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libviscoelasticTransportModels.so"
#7  Foam::multiMode::correct() in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libviscoelasticTransportModels.so"
#8  Foam::viscoelasticModel::correct() in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/lib/libviscoelasticTransportModels.so"
#9
in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/bin/BuoyantBoussinesqViscoelasticFluidFoam"
#10  __libc_start_main in "/lib/i386-linux-gnu/libc.so.6"
#11
in "/home/mostafa/OpenFOAM/OpenFOAM-2.1.0/platforms/linuxGccDPOpt/bin/BuoyantBoussinesqViscoelasticFluidFoam"
Floating point exception```
my solver is the viscoelasticFluidFoam that I made some changes to it for solving natural convection. when I ran it, after some iterate the above error appeared.

anyone is here can help me????

thanks.

 October 8, 2012, 05:23 #6 Senior Member     ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 11 Hi If I want to speak general your schemes and/or methods for solving system of linear equations and/or their adjustments are improper.

October 8, 2012, 06:12
#7
Senior Member

Mostafa Mahmoudi
Join Date: Jan 2012
Posts: 319
Rep Power: 8
Quote:
 Originally Posted by ata Hi If I want to speak general your schemes and/or methods for solving system of linear equations and/or their adjustments are improper.
hi ata,.
can you tell me the details? I'm about two weeks that staying behind this error.

thank you.

 September 12, 2013, 15:24 #8 New Member   Erick Lorenzato Join Date: Mar 2013 Posts: 8 Rep Power: 6 Hello, I am trying to simulate a runoff, but I'm having the following problem: What can I do? Thanks Code: ```/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM Extend Project: Open source CFD | | \\ / O peration | Version: 1.6-ext | | \\ / A nd | Web: www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 1.6-ext-e61a8f0a3194 Exec : viscoelasticInterFoam Date : Sep 12 2013 Time : 16:23:40 Host : administrador-desktop PID : 10189 Case : /home/administrador/tutorials/viscoelastic/VIFErick/Escoamento nProcs : 1 SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 // using new solver syntax: U { solver PBiCG; preconditioner { preconditioner DILU; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } // using new solver syntax: taufirst { solver BiCGStab; preconditioner { preconditioner Cholesky; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } // using new solver syntax: tau { solver BiCGStab; preconditioner { preconditioner Cholesky; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } Reading g Reading transportProperties Reading field pd Reading field alpha Reading field U Reading/calculating face flux field phi Calculating field g.h Selecting viscoelastic model Giesekus time step continuity errors : sum local = 6.31081e-07, global = -6.31081e-07, cumulative = -6.31081e-07 --> FOAM FATAL ERROR: Continuity error cannot be removed by adjusting the outflow. Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow. Specified mass inflow : 7.65133e-08 Specified mass outflow : 0 Difference : 7.65133e-08 Adjustable mass outflow : 0 From function adjustPhi ( surfaceScalarField& phi, const volVectorField& U, const volScalarField& p ) in file cfdTools/general/adjustPhi/adjustPhi.C at line 141. FOAM exiting```

 September 13, 2013, 02:39 #9 Senior Member   Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 15 Please check the velocity boundary conditions. What are the velocity boundary conditions in your case?

 September 13, 2013, 10:53 #10 New Member   Erick Lorenzato Join Date: Mar 2013 Posts: 8 Rep Power: 6 Hi, Thanks for reply My code for velocity is: Code: ```/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM Extend Project: Open Source CFD | | \\ / O peration | Version: 1.6-ext | | \\ / A nd | Web: www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type fixedValue; value uniform (0.01868 0 0); } fixedWalls { type fixedValue; value uniform (0 0 0); } frontAndBack { type empty; } outlet { type zeroGradient; } simetry { type symmetryPlane; } atmosphere { type pressureInletOutletVelocity; phi phi; value uniform (0 0 0); } } // ************************************************************************* //``` When I run potentialFoam, the program gives me Code: ```/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM Extend Project: Open source CFD | | \\ / O peration | Version: 1.6-ext | | \\ / A nd | Web: www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 1.6-ext-e61a8f0a3194 Exec : potentialFoam Date : Sep 13 2013 Time : 11:55:07 Host : administrador-desktop PID : 16452 Case : /home/administrador/tutorials/viscoelastic/VIFErick/Escoamento nProcs : 1 SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 // using new solver syntax: U { solver PBiCG; preconditioner { preconditioner DILU; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } // using new solver syntax: taufirst { solver BiCGStab; preconditioner { preconditioner Cholesky; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } // using new solver syntax: tau { solver BiCGStab; preconditioner { preconditioner Cholesky; } minIter 0; maxIter 1000; tolerance 1e-06; relTol 0; } Reading field p Reading field U --> FOAM FATAL IO ERROR: keyword SIMPLE is undefined in dictionary "/home/administrador/tutorials/viscoelastic/VIFErick/Escoamento/system/fvSolution" file: /home/administrador/tutorials/viscoelastic/VIFErick/Escoamento/system/fvSolution at line 21. From function dictionary::subDict(const word& keyword) const in file db/dictionary/dictionary.C at line 457. FOAM exiting``` I tried move and ajust velocity, but the errors continues I'm really lost

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