Linear system solver could not determine the solution
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I have a simulation using the EM LF Electro Quasi-Static solver and when I run it I get the error Linear system solver could not determine the solution. I have no idea what the error is.
What is the
REASON ERRORthat the solver is returning?
The log of the solver is shown below:[INFO]: iSolve X, Version 5.0.1 (4765), 64Bit Windows [INFO]: [INFO]: [INFO]: Running MPI version 2.0 on 1 process. [INFO]: Loading all solver modules: [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\EmFdtdSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\EmLfComplexValuedSolvers.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\EmLfRealValuedSolvers.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\EmLfUnstructuredSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\EmModeMatchingSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\FluidSolverSchur.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\FluidSolverSimple.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\GradientCoilSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\NeuronSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\ScalarSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\SonicSolver.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\ThermalSolverDouble.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\ThermalSolverSingle.x.dll' [INFO]: Loaded 'C:\Program Files\Sim4LifeLight_v5.0.1.4765\Solvers\ThermalUnstructuredSolver.x.dll' [INFO]: [INFO]: [INFO]: Simulation 'LF' started on 2020-Feb-06 16:56:16 [INFO]: [INFO]: Solver type: EmLf, ElectroQuasiStatic [INFO]: Input file name: C:\Users\Dimitris\Desktop\CSF/CSF.smash_Results/27ee99eb-31f4-4be3-bc28-fce65535515e_Input.h5 [INFO]: Input file generated by: Sim4Life light, Version 5.0.1.4765 [INFO]: Output file name: C:\Users\Dimitris\Desktop\CSF/CSF.smash_Results/27ee99eb-31f4-4be3-bc28-fce65535515e_Output.h5 [INFO]: [INFO]: Using Sim4Life light license features. [INFO]: [2020-Feb-06 16:56:17] Checking out license feature 'QS_SOLVER', expiring the 7-jan-2021, version 5.0, (1). [INFO]: No additional options set to solver step [INFO]: Grid size is 110x113x103 [INFO]: [INFO]: Solid settings: frequency = 1000 Hz, characteristic length (worst case domain diagonal) 0.47321 [INFO]: Epsilon Mu SigmaE QS Approx. Quality Static Magn. Field SigmaE/w*Epsilon Solid name [INFO]: 1 1 0 9.8362e-11 0 0 'Background' [INFO]: 109 1 2 1.0721e-08 0.0035361 3.2982e+05 'CSF 1 (Head Meshes)' [INFO]: 1.64e+05 1 0.119 1.6167e-05 0.00021006 12.993 'Brain 1 (Head Meshes)' [INFO]: 2.7e+03 1 0.0202 2.6581e-07 3.5638e-05 134.07 'Skull 1 (Head Meshes)' [INFO]: 1.14e+03 1 0.0002 1.117e-07 3.5373e-07 3.1667 'Scalp 1 (Head Meshes)' [INFO]: [INFO]: Dynamic range is 3.59502e+07 (lower limit solid Background (1) and upper limit solid CSF 1 (Head Meshes) (3.59502e+07)). [INFO]: [INFO]: Boundary conditions: [INFO]: X-: dirichlet, (0,0) [INFO]: X+: dirichlet, (0,0) [INFO]: Y-: dirichlet, (0,0) [INFO]: Y+: dirichlet, (0,0) [INFO]: Z-: dirichlet, (0,0) [INFO]: Z+: dirichlet, (0,0) [INFO]: [INFO]: Set fixed potential for GND - base (Electrode Meshes) with value (0,0) [INFO]: Set fixed potential for VCC - base (Electrode Meshes) with value (25,0) [INFO]: Solid GND - base (Electrode Meshes): PEC (960 edges) [INFO]: Solid VCC - base (Electrode Meshes): PEC (895 edges) [INFO]: Degree of freedoms: 1316016 total, 1244448 unknowns, 71568 Dirichlet points, 0 collapsed points, 0 unused. [INFO]: Initialization of grid, dof-handler and boundary conditions.: Current and peak memory usage: 26.48 MB / 40.75 MB (current is 65.0 % of peak) [INFO]: Computing number of non-zeros [INFO]: Elapsed time for 'Computing number of non-zeros' was 00:00:00 wall clock time. [INFO]: Assembling matrix [INFO]: Elapsed time for 'Assembling matrix' was 00:00:13 wall clock time. [INFO]: [INFO]: Apply Dirichlet boundary condition [INFO]: Scaling of Dirichlet point trivial equation is 1.96278e-14 [INFO]: Elapsed time for 'Apply Dirichlet boundary condition' was 00:00:00 wall clock time. [INFO]: Prepared linear system: Current and peak memory usage: 231.2 MB / 442.5 MB (current is 52.3 % of peak) [INFO]: Solve linear system with 1316016 = 1.31602*10^6 dofs (degrees of freedom). [INFO]: Setting up preconditioner [INFO]: Elapsed time for 'Setting up preconditioner' was 00:00:01 wall clock time. [INFO]: Setup preconditioner and Krylov solver: Current and peak memory usage: 599.0 MB / 619.1 MB (current is 96.8 % of peak) [INFO]: Target relative preconditioned residual tolerance is 1e-12, max iterations 100000 [INFO]: Solving linear system [INFO]: Initial preconditioned residuum is nan (has to drop by a factor of 1e-12) [INFO]: Elapsed time for 'Solving linear system' was 00:00:00 wall clock time. [INFO]: Solved linear system: Current and peak memory usage: 599.0 MB / 619.1 MB (current is 96.8 % of peak) [INFO]: Solver returns: 'REASON ERROR'. [ERROR]: Linear system solver could not determine the solution. [INFO]: Solved potential simulation's linear system: Current and peak memory usage: 44.64 MB / 619.1 MB (current is 7.2 % of peak) [INFO]: EM-Low-Frequency simulation finished with errors. [INFO]: [ERROR]: Simulation 'LF' failed on 2020-Feb-06 16:56:33 [INFO]: [2020-Feb-06 16:56:33] Released license feature 'QS_SOLVER'. [INFO]: Peak memory usage: 619.1 MB (649207808 Bytes) [INFO]: [ERROR]: iSolve framework failed (see previous error messages).Thank you!