[omid_Mech]

What's the problem? How can I solve this problem?

Time = 0.405
DILUPBiCG: Solving for Ux, Initial residual = 0.5097331, Final residual = 0.0023824212, No Iterations 1
DILUPBiCG: Solving for Uy, Initial residual = 0.25638059, Final residual = 0.00087452102, No Iterations 1
DILUPBiCG: Solving for Uz, Initial residual = 0.63890489, Final residual = 0.0059174217, No Iterations 1
DILUPBiCG: Solving for T, Initial residual = 0.036242806, Final residual = 0.001220973, No Iterations 1
DICPCG: Solving for p_rgh, Initial residual = 0.95444321, Final residual = 0.007510328, No Iterations 2
time step continuity errors : sum local = 1.4215901e+16, global = 0.056628085, cumulative = 0.058980637
DILUPBiCG: Solving for epsilon, Initial residual = 0.99999479, Final residual = 0.067805608, No
Iterations 4
bounding epsilon, min: -1.361924e+12 max: 6.8537107e+37 average: 1.1420554e+33
DILUPBiCG: Solving for k, Initial residual = 5.7982269e-07, Final residual = 5.7982269e-07, No
Iterations 0
bounding k, min: 0 max: 2.4082761e+15 average: 2.8124442e+10
#0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam211/platforms/linux64GccDPOpt/lib/
libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam211/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/opt/
openfoam211/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4 void Foam::divide<Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField,
Foam::volMesh>&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&,
Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/opt/openfoam211/platforms/
linux64GccDPOpt/lib/libfiniteVolume.so"
#5 at kEpsilon.C:0
#6 Foam::incompressible::RASModels::kEpsilon::correct () in "/opt/openfoam211/platforms/linux64GccDPOpt/
lib/libincompressibleRASModels.so"
#7
in "/opt/openfoam211/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
#8 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#9
in "/opt/openfoam211/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
Floating point exception (core dumped)

[miladrakhsha]

Originally Posted by omid_Mech

What's the problem? How can I solve this problem?

Time = 0.405
DILUPBiCG: Solving for Ux, Initial residual = 0.5097331, Final residual = 0.0023824212, No Iterations 1
DILUPBiCG: Solving for Uy, Initial residual = 0.25638059, Final residual = 0.00087452102, No Iterations 1
DILUPBiCG: Solving for Uz, Initial residual = 0.63890489, Final residual = 0.0059174217, No Iterations 1
DILUPBiCG: Solving for T, Initial residual = 0.036242806, Final residual = 0.001220973, No Iterations 1
DICPCG: Solving for p_rgh, Initial residual = 0.95444321, Final residual = 0.007510328, No Iterations 2
time step continuity errors : sum local = 1.4215901e+16, global = 0.056628085, cumulative = 0.058980637
DILUPBiCG: Solving for epsilon, Initial residual = 0.99999479, Final residual = 0.067805608, No
Iterations 4
bounding epsilon, min: -1.361924e+12 max: 6.8537107e+37 average: 1.1420554e+33
DILUPBiCG: Solving for k, Initial residual = 5.7982269e-07, Final residual = 5.7982269e-07, No
Iterations 0
bounding k, min: 0 max: 2.4082761e+15 average: 2.8124442e+10
#0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam211/platforms/linux64GccDPOpt/lib/
libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam211/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/opt/
openfoam211/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4 void Foam::divide<Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField,
Foam::volMesh>&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&,
Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/opt/openfoam211/platforms/
linux64GccDPOpt/lib/libfiniteVolume.so"
#5 at kEpsilon.C:0
#6 Foam::incompressible::RASModels::kEpsilon::correct () in "/opt/openfoam211/platforms/linux64GccDPOpt/
lib/libincompressibleRASModels.so"
#7
in "/opt/openfoam211/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
#8 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#9
in "/opt/openfoam211/platforms/linux64GccDPOpt/bin/buoyantBoussinesqSimpleFoam"
Floating point exception (core dumped)

I do not really think that anybody can help you with this little information you provided. Could you post your fvSolution, fvSchemes files along with the result of checkMesh utility?
Are using simple or pimple? Why do you have time step instead of iteration numbers in your log file if you are using SIMPLE?
And the last thing:
I suggest before you post a new topic with a vague title that nobody else can use except yourself, have a search a little bit in different pages of this forum and you will probably find the right post to ask your question there. If you could not really find the answer, which I highly doubt, you can always post something new with a meaningful topic and more details about your case.