I was trying to solve the GUI Tutorial 7 "Magnetic field induced by harmonic current in a wire" but I get incorrect results (the magnetic field strength, current density etc are zero everywhere) as well as an error message from the solver.

After following the tutorial, I get the following .sif file:

Code: Select all

```
Header
CHECK KEYWORDS Warn
Mesh DB "." "."
Include Path ""
Results Directory ""
End
Simulation
Max Output Level = 5
Coordinate System = Cartesian
Coordinate Mapping(3) = 1 2 3
Simulation Type = Steady state
Steady State Max Iterations = 1
Output Intervals = 1
Timestepping Method = BDF
BDF Order = 1
Coordinate Scaling = 1.0e-3
Angular Frequency = 1.0e5
Solver Input File = case.sif
Post File = case.vtu
End
Constants
Gravity(4) = 0 -1 0 9.82
Stefan Boltzmann = 5.67e-08
Permittivity of Vacuum = 8.8542e-12
Boltzmann Constant = 1.3807e-23
Unit Charge = 1.602e-19
End
Body 1
Target Bodies(1) = 1
Name = "Body 1"
Equation = 1
Material = 1
End
Body 2
Target Bodies(1) = 2
Name = "Body 2"
Equation = 1
Material = 2
End
Solver 1
Equation = MgHarm
Procedure = "MagnetoDynamics" "WhitneyAVHarmonicSolver"
Exec Solver = Always
Stabilize = True
Bubbles = False
Lumped Mass Matrix = False
Optimize Bandwidth = True
Steady State Convergence Tolerance = 1.0e-5
Nonlinear System Convergence Tolerance = 1.0e-7
Nonlinear System Max Iterations = 20
Nonlinear System Newton After Iterations = 3
Nonlinear System Newton After Tolerance = 1.0e-3
Nonlinear System Relaxation Factor = 1
Linear System Solver = Iterative
Linear System Iterative Method = BiCGStabl
Linear System Max Iterations = 500
Linear System Convergence Tolerance = 1.0e-10
BiCGstabl polynomial degree = 4
Linear System Preconditioning = none
Linear System ILUT Tolerance = 1.0e-3
Linear System Abort Not Converged = False
Linear System Residual Output = 10
Linear System Precondition Recompute = 1
End
Solver 2
Equation = MgDynPost
Procedure = "MagnetoDynamics" "MagnetoDynamicsCalcFields"
Calculate Magnetic Field Strength = True
Calculate Joule Heating = True
Discontinuous Bodies = True
Exec Solver = Before Saving
Stabilize = True
Bubbles = False
Lumped Mass Matrix = False
Optimize Bandwidth = True
Steady State Convergence Tolerance = 1.0e-5
Nonlinear System Convergence Tolerance = 1.0e-7
Nonlinear System Max Iterations = 20
Nonlinear System Newton After Iterations = 3
Nonlinear System Newton After Tolerance = 1.0e-3
Nonlinear System Relaxation Factor = 1
Linear System Solver = Iterative
Linear System Iterative Method = BiCGStab
Linear System Max Iterations = 500
Linear System Convergence Tolerance = 1.0e-10
BiCGstabl polynomial degree = 2
Linear System Preconditioning = ILU0
Linear System ILUT Tolerance = 1.0e-3
Linear System Abort Not Converged = False
Linear System Residual Output = 10
Linear System Precondition Recompute = 1
End
Equation 1
Name = "MgDynHarm"
Active Solvers(1) = 1
End
Equation 2
Name = "MgDynPost"
Active Solvers(1) = 2
End
Material 1
Name = "Copper (generic)"
Electric Conductivity = 59.59e6
Relative Permeability = 0.999994
Heat Conductivity = 401.0
Youngs modulus = 115.0e9
Electric Conductivity = 59.59e6
Electric Conductivity = 59.59e6
Poisson ratio = 0.34
Youngs modulus = 115.0e9
Heat Capacity = 385.0
Youngs modulus = 115.0e9
Relative Permeability = 0.999994
Electric Conductivity = 59.59e6
Sound speed = 3810.0
Poisson ratio = 0.34
Heat expansion Coefficient = 16.5e-6
Poisson ratio = 0.34
Porosity Model = Always saturated
Mesh Poisson ratio = 0.34
Relative Permeability = 0.999994
Electric Conductivity = 59.59e6
Density = 8960.0
Relative Permeability = 0.999994
End
Material 2
Name = "Air (room temperature)"
Relative Permeability = 1.00000037
Heat Conductivity = 0.0257
Turbulent Prandtl Number = 0.713
Heat Capacity = 1005.0
Relative Permittivity = 1.00059
Relative Permeability = 1.00000037
Viscosity = 1.983e-5
Viscosity = 1.983e-5
Sound speed = 343.0
Heat expansion Coefficient = 3.43e-3
Relative Permittivity = 1.00059
Porosity Model = Always saturated
Relative Permittivity = 1.00059
Relative Permittivity = 1.00059
Relative Permeability = 1.00000037
Density = 1.205
Relative Permeability = 1.00000037
End
Boundary Condition 1
Target Boundaries(1) = 1
Name = "Ground"
AV re {e} 2 = 0
AV im = 0
AV im {e} 2 = 0
AV re = 0
AV re {e} 1 = 0
AV im {e} 1 = 0
End
Boundary Condition 2
Target Boundaries(1) = 3
Name = "Voltage"
AV re {e} 2 = 0
AV im = 0
AV im {e} 2 = 0
AV re = 0.01
AV re {e} 1 = 0
AV im {e} 1 = 0
End
Boundary Condition 3
Target Boundaries(1) = 4
Name = "AxialField"
AV re {e} 2 = 0
AV im {e} 2 = 0
AV re {e} 1 = 0
AV im {e} 1 = 0
End
```

Here is the solver log which shows an error message after the post-processing steps:

Code: Select all

```
ELMER SOLVER (v 8.4) STARTED AT: 2019/01/03 15:39:21
ParCommInit: Initialize #PEs: 1
MAIN:
MAIN: =============================================================
MAIN: ElmerSolver finite element software, Welcome!
MAIN: This program is free software licensed under (L)GPL
MAIN: Copyright 1st April 1995 - , CSC - IT Center for Science Ltd.
MAIN: Webpage http://www.csc.fi/elmer, Email elmeradm@csc.fi
MAIN: Version: 8.4 (Rev: unknown, Compiled: 2019-01-02)
MAIN: Running one task without MPI parallelization.
MAIN: Running with just one thread per task.
MAIN: HYPRE library linked in.
MAIN: MUMPS library linked in.
MAIN: Lua interpreted linked in.
MAIN: =============================================================
MAIN:
MAIN:
MAIN: -------------------------------------
MAIN: Reading Model: case.sif
Caught LUA error:[string "loadfile(os.getenv("ELMER_HOME") .. "/share..."]:1: attempt to call a nil value
Caught LUA error:[string "loadstring(readsif("case.sif"))()"]:1: attempt to call global 'readsif' (a nil value)
LoadInputFile: Scanning input file: case.sif
LoadInputFile: Loading input file: case.sif
WARNING:: LoadInputFile: > Equation 2 < not used in any Body!
Loading user function library: [MagnetoDynamics]...[WhitneyAVHarmonicSolver_Init0]
Loading user function library: [MagnetoDynamics]...[MagnetoDynamicsCalcFields_Init0]
LoadMesh: Base mesh name: ./.
LoadMesh: Scaling coordinates: 1.000E-03 1.000E-03 1.000E-03
LoadMesh: Elapsed REAL time: 0.0589 (s)
MAIN: -------------------------------------
AddVtuOutputSolverHack: Adding ResultOutputSolver to write VTU output in file: case
Loading user function library: [MagnetoDynamics]...[WhitneyAVHarmonicSolver_Init]
Loading user function library: [MagnetoDynamics]...[WhitneyAVHarmonicSolver_bulk]
Loading user function library: [MagnetoDynamics]...[WhitneyAVHarmonicSolver]
OptimizeBandwidth: ---------------------------------------------------------
OptimizeBandwidth: Computing matrix structure for: mgharm...done.
OptimizeBandwidth: Half bandwidth without optimization: 19380
OptimizeBandwidth:
OptimizeBandwidth: Bandwidth Optimization ...done.
OptimizeBandwidth: Half bandwidth after optimization: 2808
OptimizeBandwidth: ---------------------------------------------------------
Loading user function library: [MagnetoDynamics]...[MagnetoDynamicsCalcFields_Init]
Loading user function library: [MagnetoDynamics]...[MagnetoDynamicsCalcFields_bulk]
Loading user function library: [MagnetoDynamics]...[MagnetoDynamicsCalcFields]
Loading user function library: [ResultOutputSolve]...[ResultOutputSolver_Init]
Loading user function library: [ResultOutputSolve]...[ResultOutputSolver_bulk]
Loading user function library: [ResultOutputSolve]...[ResultOutputSolver]
MAIN:
MAIN: -------------------------------------
MAIN: Steady state iteration: 1
MAIN: -------------------------------------
MAIN:
SingleSolver: Attempting to call solver
SingleSolver: Solver Equation string is: mgharm
DefUtils::DefaultDirichletBCs: Setting Dirichlet boundary conditions
DefUtils::DefaultDirichletBCs: Dirichlet boundary conditions set
10 0.1358E-03
20 0.1231E-05
30 0.2292E-07
40 0.1325E-08
ComputeChange: NS (ITER=1) (NRM,RELC): ( 0.83324018E-03 2.0000000 ) :: mgharm
DefUtils::DefaultDirichletBCs: Setting Dirichlet boundary conditions
DefUtils::DefaultDirichletBCs: Dirichlet boundary conditions set
ComputeChange: NS (ITER=2) (NRM,RELC): ( 0.83324018E-03 0.0000000 ) :: mgharm
Loading user function library: [MagnetoDynamics]...[WhitneyAVHarmonicSolver_post]
ComputeChange: SS (ITER=1) (NRM,RELC): ( 0.83324018E-03 2.0000000 ) :: mgharm
SingleSolver: Attempting to call solver
SingleSolver: Solver Equation string is: mgdynpost
Loading user function library: [MagnetoDynamics]...[MagnetoDynamicsCalcFields_post]
SingleSolver: Attempting to call solver
SingleSolver: Solver Equation string is: internalvtuoutputsolver
ResultOutputSolver: -------------------------------------
ResultOutputSolve: Saving with prefix: case
ResultOutputSolver: Creating list for saving - if not present
CreateListForSaving: Field Variables for Saving
ResultOutputSolver: Saving in unstructured VTK XML (.vtu) format
VtuOutputSolver: Saving results in VTK XML format with prefix: case
VtuOutputSolver: Saving number of partitions: 1
WriteVtuFile: Writing variable: joule heating e
WriteVtuFile: Writing variable: magnetic flux density re e
WriteVtuFile: Writing variable: magnetic flux density im e
WriteVtuFile: Writing variable: magnetic field strength re e
WriteVtuFile: Writing variable: magnetic field strength im e
ResultOutputSolver: -------------------------------------
Loading user function library: [ResultOutputSolve]...[ResultOutputSolver_post]
ElmerSolver: *** Elmer Solver: ALL DONE ***
free(): invalid pointer
Program received signal SIGABRT: Process abort signal.
Backtrace for this error:
#0 0x7f8c7307c2da in ???
#1 0x7f8c7307b503 in ???
#2 0x7f8c72caef1f in ???
#3 0x7f8c72caee97 in ???
#4 0x7f8c72cb0800 in ???
#5 0x7f8c72cf9896 in ???
#6 0x7f8c72d00909 in ???
#7 0x7f8c72d07e1b in ???
#8 0x7f8c7349d2a6 in __lists_MOD_releasevariablelist
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/Lists.F90:849
#9 0x7f8c736ae834 in __meshutils_MOD_releasemesh
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/MeshUtils.F90:15226
#10 0x7f8c73529a31 in __modeldescription_MOD_freemesh
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/ModelDescription.F90:5307
#11 0x7f8c73529ac1 in __modeldescription_MOD_freemodel
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/ModelDescription.F90:5374
#12 0x7f8c7383cd47 in elmersolver_
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/ElmerSolver.F90:651
#13 0x55873c2a115b in solver
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/Solver.F90:69
#14 0x55873c2a0eae in main
at /build/elmerfem-csc-qCDGI2/elmerfem-csc-8.4-0ppa0/fem/src/Solver.F90:34
```

When I look at the results in Paraview, the Magnetic Field Strength seems to be zero everywhere. I checked that the potential is really 0.01V on one end of the wire and 0V on the other end (see

**potential.png**):

Project Files:

Does anyone know where the problem could be?

Also, are there "solutions" to the GUI tutorials (for example the .sif files for the tutorials)?

Thanks!