Search found 4173 matches

by raback
20 Jul 2021, 01:46
Forum: ElmerSolver
Topic: Weird divergence behaviour
Replies: 4
Views: 183

Re: Weird divergence behaviour

Hi Andrea, You've been working hard with a very complex case that would deserve some closer attention! Unfortunately I haven't had time to look it that closely. It is easier for some cases where you get an idea just by reading through the sif file. Convergence issues are more difficult. Could you ma...
by raback
20 Jul 2021, 01:41
Forum: ElmerSolver
Topic: Sliding contact along a curved boundary
Replies: 5
Views: 135

Re: Sliding contact along a curved boundary

Hi David, Interesting stuff! I only glanced the sif file so this is not that well educated even. I'm a little bit unsure whether it is a good idea to combine RigidMeshMapper + Elasticity solver. It might be. But I've a feeling that the rigid rotations should be applied to the Displacement field as w...
by raback
20 Jul 2021, 01:26
Forum: ElmerSolver
Topic: Integration of current density in 2D Axi symmetric steady state to obtain current in circular wire
Replies: 8
Views: 452

Re: Integration of current density in 2D Axi symmetric steady state to obtain current in circular wire

Hi Felix, There is nothing to worry about the code not finding "curr". It was just a temporal tag that we know to look for because we given the same in "mask name 1". This way we can refer to the boundaries where we want to operate in. If you follow my example, the possible probl...
by raback
20 Jul 2021, 01:12
Forum: ElmerSolver
Topic: Circuit Model Depth parameter effect
Replies: 5
Views: 198

Re: Circuit Model Depth parameter effect

Hi,

I think that your computation is just for unit length. Hence after computation you need to multiply the results that are dependent on the length (nodal forces, torque etc.) with the length of the motor.

I think the coordinate scaling does not have an effect as it just multiplies zeros.

-Peter
by raback
20 Jul 2021, 01:07
Forum: ElmerSolver
Topic: Problem in nonlinear damped vibration
Replies: 7
Views: 269

Re: Problem in nonlinear damped vibration

Hi

Is this the same case where the Dirichlet conditions were not active?

Generally, if a code works for some setup but after changing BCs or mesh it does not any more, it is not very likely that the error would be in the actual physical model.

-Peter
by raback
20 Jul 2021, 01:03
Forum: ElmerSolver
Topic: Question about latent heat
Replies: 1
Views: 106

Re: Question about latent heat

Hi There are methods for phase change that track the interface (lagrangian) and methods where the mesh is fixed (eulerian). The given melting point is typically related to the lagrangian methods where the temperature on the interface may be set. If the interface is not exactly at the element boudary...
by raback
20 Jul 2021, 00:43
Forum: Installation & compilation
Topic: Elmer does not tag when calculation is finished in multicore
Replies: 4
Views: 554

Re: Elmer does not tag when calculation is finished in multicore

Hi Lida, No I don't it is that easy to alter the exit style of Elmer. I could do it, but I would need a confirmation that it really helps. What is the code reading the exit code and how? You could make a three-line Fortran program that exits with different styles (eg. "STOP 0" or "CAL...
by raback
20 Jul 2021, 00:35
Forum: Installation & compilation
Topic: Paralleling computation with umfpack
Replies: 2
Views: 140

Re: Paralleling computation with umfpack

Hi Andrea, No. Umfpack is not MPI parallel library. Of the actively supported direct linear solvers MUMPS is parallel, also on some platforms you could compile with MKL Pardiso. This is not a limitation by Elmer. It is just that many algorithms are just so much easier to code in serial that the MPI ...
by raback
20 Jul 2021, 00:30
Forum: General
Topic: RF Coil Design
Replies: 2
Views: 168

Re: RF Coil Design

Hi A good source for the circuits could be the presentation by Eelis below: https://www.youtube.com/watch?v=AhKiZJa3RU8 Slides for that are available at (the 5th presentation): https://www.nic.funet.fi/pub/sci/physics/elmer/webinar/ There are also plenty of test cases for the circuits. It is pretty ...
by raback
20 Jul 2021, 00:16
Forum: General
Topic: Magnetism
Replies: 6
Views: 6023

Re: Magnetism

Hi, I'm not expert in magnetism but what Elmer has is a) given magnetization b) possibility to define B/H curve and c) Zirka hysteresis model where the up and down slope for B/H curve are defined separately. The model c) is only available for 2D. Maybe you can from these deduce whether the magnets y...