Coarse solver did not converge (MEG)
Hi, @christi @juan.garciaprieto @sophie.schrader
We have just noticed a new error, this one appears in the case of the high tetra mesh density, for the MEG, (with the CG, venant model + std parameters).
we have never reached this step for this model since the MEG fails before, since we have solved the high memory cach problem, now the program achieve this step and then fails,
here is the error
DUNEURO> Error log:
Reading 3d Gmsh grid...
version 2.2 Gmsh file detected
file contains 786143 nodes
file contains 4334286 elements
number of real vertices = 786143
number of boundary elements = 0
number of elements = 4334286
volume_conductor.time_reading_gmsh = 322.639
tensors = 5
time = 0.000997
volume_conductor.time_reading_tensors = 0.000997
volume_conductor.time_reordering_indices = 0.152637
volume_conductor.time = 322.793
degree = 1
element_type = tetrahedron
WARNING: You are using AMG without SuperLU! Please consider installing SuperLU, or set the usesuperlu flag to false to suppress this warning.
time = 0.0219416
time = 0.0219428
time = 0.709101
This is a new model. Compute the transfer Matrix.
solver.coil_0.projection_0.time_rhs_assembly = 5.39961
=== matrix setup (max) 5.21023 s
solver.coil_0.projection_0.linear_system_solver.time_matrix_setup = 5.21023
solver.coil_0.projection_0.linear_system_solver.time_matrix_assembly = 15.631
solver.coil_0.projection_0.linear_system_solver.iterations = 404
solver.coil_0.projection_0.linear_system_solver.reduction = 9.88265e-011
solver.coil_0.projection_0.linear_system_solver.conv_rate = 0.944571
solver.coil_0.projection_0.linear_system_solver.time_solution = 196.472
solver.coil_0.projection_0.linear_system_solver.time = 217.314
solver.coil_0.projection_0.linear_system_solver.time = 217.366
solver.coil_0.projection_0.time_solution = 217.366
solver.coil_0.projection_0.time = 222.765
solver.coil_1.projection_0.time_rhs_assembly = 4.03322
solver.coil_1.projection_0.linear_system_solver.iterations = 99
solver.coil_1.projection_0.linear_system_solver.reduction = 9.40078e-011
solver.coil_1.projection_0.linear_system_solver.conv_rate = 0.791988
...
...
solver.coil_151.projection_0.linear_system_solver.iterations = 41
solver.coil_151.projection_0.linear_system_solver.reduction = 4.81438e-011
solver.coil_151.projection_0.linear_system_solver.conv_rate = 0.560215
solver.coil_151.projection_0.linear_system_solver.time_solution = 20.1182
solver.coil_151.projection_0.linear_system_solver.time = 20.1192
solver.coil_151.projection_0.linear_system_solver.time = 20.158
solver.coil_151.projection_0.time_solution = 20.158
solver.coil_151.projection_0.time = 24.273
solver.coil_152.projection_0.time_rhs_assembly = 4.12796
**Dune reported error: MathError [mgc:/home/juan/bst-duneuro/src/dune-istl/dune/istl/paamg/amg.hh:837]: Coarse solver did not converge**
***************************************************************************
** Error: Error during the DUNEuro computation, see logs in the command window.
***************************************************************************
Have you seen this error before, any ideas about the reason?
Thanks in advance.