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January 6, 2010, 15:21 
Cantera: Help me understand this error

#1 
New Member
Join Date: Oct 2009
Posts: 14
Rep Power: 9 
Hello everyone:
I am trying to model a reacting flow problem in OpenFOAM 1.5dev using the alternateSteadyReactingFoam solver. This is a very simple 3D setup, coflow fuel and air jets in a cylinder, similar to the Sandia flame D geometry. I used the same reaction mechanism and the species BCs as used in the dualInlet example. (I was able to run the sample dualInlet test cases for steady and unsteady configurations just fine) I attempted to run my problem for 100 timesteps, and at the 99th timestep, the solution aborted with the message: ********* terminate called after throwing an instance of 'Cantera::CanteraError' what(): std::exception Aborted ****** I am not sure where to look for the problem. Could anyone suggest where to start? Thanks!! If it helps, the log output from the prior two iterations is included, to show the residuals and solution errors upto this point: append log output from timesteps 98 and 99 Time = 98 Solving chemistry Characteristic time of chemistry: 0.1 smoothSolver: Solving for Ux, Initial residual = 0.269379, Final residual = 0.00513338, No Iterations 2 smoothSolver: Solving for Uy, Initial residual = 0.0945435, Final residual = 0.00306857, No Iterations 4 smoothSolver: Solving for Uz, Initial residual = 0.143678, Final residual = 0.00382205, No Iterations 4 PBiCG: Solving for C, Initial residual = 0.000566587, Final residual = 1.60321e05, No Iterations 2 PBiCG: Solving for CO2, Initial residual = 0.00448204, Final residual = 9.34077e05, No Iterations 1 PBiCG: Solving for O2, Initial residual = 0.000416701, Final residual = 1.09867e05, No Iterations 1 Max summe Yi = max((0*C)) [0 0 0 0 0 0 0] 0.15 Min summe Yi = min((0*C)) [0 0 0 0 0 0 0] 0 Fixed kappa in 0 cells due to large deltaY PBiCG: Solving for h, Initial residual = 0.0014209, Final residual = 8.11273e05, No Iterations 1 > FOAM Warning : From function canteraChemistryModel::calcDQ(volScalarField &dQ) in file canteraChemistryModel.C at line 321 Calculation of dQ is not yet verified GAMG: Solving for p, Initial residual = 0.301642, Final residual = 0.0105844, No Iterations 2 GAMG: Solving for p, Initial residual = 0.0109159, Final residual = 0.000542107, No Iterations 4 time step continuity errors : sum local = 0.396288, global = 0.0817594, cumulative = 0.645363 bounding p, min: 94456.6 max: 110249 average: 100011 rho max/min : 76.6465 0.983823 smoothSolver: Solving for epsilon, Initial residual = 0.06717, Final residual = 0.00570385, No Iterations 2 smoothSolver: Solving for k, Initial residual = 0.0244528, Final residual = 0.000708644, No Iterations 4 ExecutionTime = 509.54 s ClockTime = 516 s Time = 99 Solving chemistry Characteristic time of chemistry: 0.1 smoothSolver: Solving for Ux, Initial residual = 0.0881626, Final residual = 0.00316143, No Iterations 4 smoothSolver: Solving for Uy, Initial residual = 0.0794196, Final residual = 0.0028376, No Iterations 4 smoothSolver: Solving for Uz, Initial residual = 0.105029, Final residual = 0.00352823, No Iterations 4 PBiCG: Solving for C, Initial residual = 0.000613862, Final residual = 1.63715e05, No Iterations 2 PBiCG: Solving for CO2, Initial residual = 0.00455755, Final residual = 9.60917e05, No Iterations 1 PBiCG: Solving for O2, Initial residual = 0.000422945, Final residual = 1.17823e05, No Iterations 1 Max summe Yi = max((0*C)) [0 0 0 0 0 0 0] 0.15 Min summe Yi = min((0*C)) [0 0 0 0 0 0 0] 0 Fixed kappa in 0 cells due to large deltaY PBiCG: Solving for h, Initial residual = 0.000893174, Final residual = 3.83304e05, No Iterations 1 terminate called after throwing an instance of 'Cantera::CanteraError' what(): std::exception Aborted end append AAT 

January 11, 2010, 07:45 

#2  
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 3,951
Rep Power: 41 
Quote:
Bernhard 

January 12, 2010, 08:35 

#3 
Senior Member
Markus Rehm
Join Date: Mar 2009
Location: Erlangen (Germany)
Posts: 182
Rep Power: 9 
Hello,
you are facing a common problem in steadystate chemistry solution. The solution diverges at startup. When I run a simulation like that I do the following
Regards, Markus. 

Tags 
cantera, reacting, std::exception 
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