Search found 195 matches

by mika
09 Dec 2020, 09:38
Forum: Bug reports
Topic: Relation between “Magnetic Field Strength” and “Magnetic Flux Density” ?
Replies: 5
Views: 1773

Re: Relation between “Magnetic Field Strength” and “Magnetic Flux Density” ?

There was another bug in the computation of magnetic field strength. This has now been fixed in the devel branch.

Thanks for reporting,
Mika
by mika
08 Dec 2020, 14:12
Forum: Bug reports
Topic: Relation between “Magnetic Field Strength” and “Magnetic Flux Density” ?
Replies: 5
Views: 1773

Re: Relation between “Magnetic Field Strength” and “Magnetic Flux Density” ?

Hi, I found a bug in the reluctivity evaluation when the constant "Permeability of Vacuum" was given by the user in the constants section. This has now been fixed in the devel branch. The error wasn't nevertheless just a multiplication by four, so I'm not sure whether this explains your ob...
by mika
03 Dec 2020, 17:11
Forum: Bug reports
Topic: ElmerToGmshIndex in SaveUtils.F90
Replies: 1
Views: 640

Re: ElmerToGmshIndex in SaveUtils.F90

Hi,

I believe these issues have now been fixed in the devel branch of the code repository.

Thanks for reporting,
Mika
by mika
03 Dec 2020, 16:31
Forum: ElmerSolver
Topic: magnetic field of a permanent magnet in 3D
Replies: 11
Views: 1816

Re: magnetic field of a permanent magnet in 3D

Unfortunately I observed that the postprocessing solver (MagnetoDynamicsCalcFields) has neglected the magnetization vector when the magnetization vector has been given in a material section or only elemental approximations have been calculated. This has now been corrected in the devel branch of the ...
by mika
30 Nov 2020, 12:07
Forum: ElmerSolver
Topic: HelmholtzSolve and p-elements
Replies: 2
Views: 673

Re: HelmholtzSolve and p-elements

Does the Helmholtz Solver support p-elements? Yes What would be the best way to figure out if a solver supports p-elements? Is trial error a viable way (i.e. will solvers not supporting p-elements produce an error in the logs if the keyword is set?) Unfortunately it is not usually clearly indicated...
by mika
23 Nov 2020, 10:43
Forum: ElmerSolver
Topic: FERRITE CIRCULATOR
Replies: 3
Views: 775

Re: FERRITE CIRCULATOR

raback wrote: 22 Nov 2020, 14:55 . Also EMWaveSolver exists for transient problems. These both work for 3D only.
EMWaveSolver works in both 2D and 3D cases (in the case of 2D simulation the command "Use Piola Transform = True" must however be given in the sif file).
by mika
05 Nov 2020, 10:40
Forum: General
Topic: Derivation magnetic co-energy
Replies: 5
Views: 1230

Re: Derivation magnetic co-energy

Hi, To have an example I updated the test case https://github.com/ElmerCSC/elmerfem/tree/devel/fem/tests/mgdyn_bh so that the coenergy is evaluated. This produces to standard output the lines SaveScalars: Showing computed results: SaveScalars: 1: res: eddy current power 0.000000000000E+000 SaveScala...
by mika
04 Nov 2020, 11:36
Forum: General
Topic: Derivation magnetic co-energy
Replies: 5
Views: 1230

Re: Derivation magnetic co-energy

Hi,

I made a small change to the Calcfields postprocessor (available in the devel branch of the code repository). Now, if you give "Separate Magnetic Energy = True" for this solver, then the solver should also output the magnetic coenergy.

Best regards,
Mika
by mika
08 Oct 2020, 08:57
Forum: ElmerSolver
Topic: MagnetoDynamics2D - Eddy Current Off
Replies: 2
Views: 774

Re: MagnetoDynamics2D - Eddy Current Off

Hi, Is the electrical conductivity specified to be zero in the inductor (the source part of the model)? I believe the model should be set up such that in the inductor the magnetic induction B satisfies curl(nu*B) = J, with J being the given source, and thus the electrical conductivity should be zero...
by mika
03 Oct 2020, 10:55
Forum: ElmerSolver
Topic: FDTD method for acoustic analysis
Replies: 1
Views: 707

Re: FDTD method for acoustic analysis

A generalized wave equation can be solved in time domain with the module WaveSolver. The module CompressibleNS could be used to model nonlinear wave propagation under the ideal gas law in time domain, but as such it's likely to be inefficient due to employing the monolithic solution approach. Both t...