Adaptive timestting problem

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sebastien ROUQUETTE
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Adaptive timestting problem

Post by sebastien ROUQUETTE »

Good evening
i tried to use the adaptive timestepping keyword.
It seems to work for the 1st time step and after i've got a strange error... i attached my sif file with keywords for "adaptive timestepping".
I also attached the error that i got in my xterm after running "ElemrSolver"...
...
HeatSolve: -------------------------------------
HeatSolve: TEMPERATURE ITERATION 1
HeatSolve: -------------------------------------
HeatSolve:
HeatSolve: Starting Assembly...
HeatSolve: Assembly:
HeatSolve: Assembly done
DefUtils::DefaultDirichletBCs: Setting Dirichlet boundary conditions
SetNodalLoads: Checking for nodal loads for variable: temperature
SetDirichletBoundaries: Number of dofs set: 0
DefUtils::DefaultDirichletBCs: Dirichlet boundary conditions set
SolveSystem: Solving linear system
IterSolver: Using iterative method: bicgstabl
CRS_IncompleteLU: ILU(0) (Real), Starting Factorization:
CRS_IncompleteLU: ILU(0) (Real), NOF nonzeros: 40677
CRS_IncompleteLU: ILU(0) (Real), filling (%) : 100
CRS_IncompleteLU: ILU(0) (Real), Factorization ready at (s): 0.00
ERROR:: RealBiCGStab(l): Breakdown error: bnrm = NaN.

There is a Breakdown error....

Cheers for any smart idea ;-)
Attachments
Adaptive timestepping error xterm.pdf
(27.1 KiB) Downloaded 266 times
plateHT3DAdaptTimeStep.sif
(4.21 KiB) Downloaded 274 times
Rouquette Sébastien
University of Montpellier / Mechanical and Civil Engineering Lab. / Welding Group
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Re: Adaptive timestting problem

Post by annier »

Hi Sebastien,
Please post this question also in ElmerSolver section as you are likely to get answer from Peter or some other people in Elmer Solver section for question of this type. It is a very important question and i hope they will try to reply you.

Yours Sincerely,
Anil Kunwar
Anil Kunwar
Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice
raback
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Re: Adaptive timestting problem

Post by raback »

Hi Sebastian

Does this apply to other iterative solvers as well.

Maybe you could share a minimalistic test case.

-Peter
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