problem in gas-solid fluidized bed simulation
 

Calculating averages

Courant Number mean: 0.605965 max: 1.27644
Max Ur Courant Number = 1.81825
Time = 0.061

DILUPBiCG: Solving for alpha, Initial residual = 0.274526, Final residual = 4.87573e-11, No Iterations 65
Dispersed phase volume fraction = 0.198 Min(alpha) = -0.0348437 Max(alpha) = 0.651658
DILUPBiCG: Solving for alpha, Initial residual = 0.0455936, Final residual = 3.07973e-11, No Iterations 37
Dispersed phase volume fraction = 0.198 Min(alpha) = -0.057928 Max(alpha) = 1.07894
#0 Foam::error::printStack(Foam::Ostream&) in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#2 Uninterpreted:
#3 Foam::GAMGSolver::scalingFactor(Foam::Field<double >&, Foam::Field<double> const&, Foam::Field<double> const&, Foam::Field<double> const&) const in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#4 Foam::GAMGSolver::scalingFactor(Foam::Field<double >&, Foam::lduMatrix const&, Foam::Field<double>&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#5 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMa trix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#6 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/lib/libfiniteVolume.so"
#8
in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/bin/twoPhaseEulerFoam"
#9 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#10
in "/home/anoop/OpenFOAM/OpenFOAM-2.0.x/platforms/linuxGccDPOpt/bin/twoPhaseEulerFoam"

im not getting how to solve this error. can anyone suggest me what is wrong here??

You need to explain the case setup you are using if you want an answer.

P.S. The problem is here: Max(alpha) = 1.07894