CFD Online Discussion Forums - Error caused by defining a Ramp BC for a parameter

Dear Foamres

I have defined a ramp BC for a parameter to increase from 0 in the start to 2 in the end of simulation (0.15 sec)

Code:

Cchi

 (

    (0    0)

    (0.15  2)

 );

However, during simulation when the quantity reaches around 1.5, it diverges. this is my output:

Code:

 Courant Number mean: 0.0187511 max: 0.307637

deltaT = 2.20033e-05

Time = 0.113157



diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0

DILUPBiCG:  Solving for Ux, Initial residual = 3.29237e-05, Final residual = 3.19744e-12, No Iterations 2

DILUPBiCG:  Solving for Uy, Initial residual = 0.0056262, Final residual = 1.44868e-12, No Iterations 3

DILUPBiCG:  Solving for Uz, Initial residual = 0.000508302, Final residual = 1.91713e-11, No Iterations 2

DILUPBiCG:  Solving for Z, Initial residual = 3.85859e-06, Final residual = 4.80055e-10, No Iterations 1

Correcting mixture fraction variance with CvarZ = 1

Correcting scalar dissipation rate with Cchi = 1.50876

#0  Foam::error::printStack(Foam::Ostream&) in "/home/babak/OpenFOAM/OpenFOAM-2.1.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#1  Foam::sigSegv::sigHandler(int) in "/home/babak/OpenFOAM/OpenFOAM-2.1.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#2   in "/lib/x86_64-linux-gnu/libc.so.6"

#3  Foam::linearInterpolation::interpolate(Foam::List<int> const&, Foam::List<double> const&) const in "/home/babak/OpenFOAM/babak-2.1.x/platforms/linux64GccDPOpt/lib/libFlameletCombustionModels.so"

#4  Foam::combustionModels::YSLFModel<Foam::combustionModels::rhoCombustionModel, Foam::sutherlandTransport<Foam::specieThermo<Foam::janafThermo<Foam::perfectGas> > > >::correct() in "/home/babak/OpenFOAM/babak-2.1.x/platforms/linux64GccDPOpt/lib/libFlameletCombustionModels.so"

#5  

 in "/home/babak/OpenFOAM/babak-2.1.x/platforms/linux64GccDPOpt/bin/flameletFoam"

#6  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"

#7  

 in "/home/babak/OpenFOAM/babak-2.1.x/platforms/linux64GccDPOpt/bin/flameletFoam"

Segmentation fault

Would you PLZ hint me why this happens?

Regards
Bobi