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-   -   Problem during simulation of mixid fluids ( solver: buoyantBoussinesqSimpleFoam) (http://www.cfd-online.com/Forums/openfoam-solving/124931-problem-during-simulation-mixid-fluids-solver-buoyantboussinesqsimplefoam.html)

Cenzy October 15, 2013 17:02

Problem during simulation of mixid fluids ( solver: buoyantBoussinesqSimpleFoam)
 
Hello, i have a problem during the simulation. At time step 120 appears this error:
PHP Code:

Time 119

DILUPBiCG
:  Solving for UxInitial residual 0.0139645, Final residual 0.000177782No Iterations 1
DILUPBiCG
:  Solving for UyInitial residual 0.0695692, Final residual 0.00149629No Iterations 1
DILUPBiCG
:  Solving for UzInitial residual 0.00854331, Final residual 0.000104617No Iterations 1
DILUPBiCG
:  Solving for TInitial residual 1.82591e-05, Final residual 1.04656e-06No Iterations 1
DICPCG
:  Solving for p_rghInitial residual 0.00275292, Final residual 2.67241e-05No Iterations 104
time step continuity errors 
sum local 1.81111e+20, global = -1.38938e+14cumulative = -1.38938e+14
DILUPBiCG
:  Solving for epsilonInitial residual 8.46206e-05, Final residual 5.14476e-07No Iterations 1
DILUPBiCG
:  Solving for kInitial residual 0.0547818, Final residual 0.0014389No Iterations 2
ExecutionTime 
33.6 s  ClockTime 34 s

Time 
120

DILUPBiCG
:  Solving for UxInitial residual 0.0676242, Final residual 0.00181908No Iterations 1
DILUPBiCG
:  Solving for UyInitial residual 0.151587, Final residual 0.00257395No Iterations 1
DILUPBiCG
:  Solving for UzInitial residual 0.138446, Final residual 0.00143008No Iterations 1
DILUPBiCG
:  Solving for TInitial residual 0.0807921, Final residual 0.00076082No Iterations 1
#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1  Foam::sigFpe::sigHandler(int) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2   in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::DICPreconditioner::calcReciprocalD(Foam::Field<double>&, Foam::lduMatrix const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4  Foam::DICPreconditioner::DICPreconditioner(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#5  Foam::lduMatrix::preconditioner::addsymMatrixConstructorToTable<Foam::DICPreconditioner>::New(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#6  Foam::lduMatrix::preconditioner::New(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#7  Foam::PCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#8  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libfiniteVolume.so"
#9  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
#10  
 
at buoyantBoussinesqSimpleFoam.C:0
#11  
 
in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
#12  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" 

Can someone help me?
the case consist in mixing of two turbulent flows of water at different velocity and temperature, in correspondence of a curve at 90 ◦ of a to duct. The solver is buoyantBoussinesqSimpleFoam and the model of turbolence is k − ε

jherb October 19, 2013 17:06

The log file shows that your problem is already caused in the previous time steps. What are your boundary conditions? The mesh quality? When does the continuity error start to explode?
Quote:

Originally Posted by Cenzy (Post 457154)
Hello, i have a problem during the simulation. At time step 120 appears this error:
PHP Code:

Time 119

...
time step continuity errors sum local 1.81111e+20, global = -1.38938e+14cumulative = -1.38938e+14
...

Time 120

...
#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" 

Can someone help me?
the case consist in mixing of two turbulent flows of water at different velocity and temperature, in correspondence of a curve at 90 ◦ of a to duct. The solver is buoyantBoussinesqSimpleFoam and the model of turbolence is k − ε



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