Search found 177 matches

by mika
08 Oct 2020, 08:57
Forum: ElmerSolver
Topic: MagnetoDynamics2D - Eddy Current Off
Replies: 2
Views: 53

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: 58

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...
by mika
01 Oct 2020, 11:10
Forum: ElmerSolver
Topic: Understanding the Implementation of Piezoelectricity in StatElecSolve.F90
Replies: 2
Views: 97

Re: Understanding the Implementation of Piezoelectricity in StatElecSolve.F90

where the "2D-plane"-limitation can be found in (the theory of) this code? I think the implementation for 2D cases (dim=2) is restricted to plane strain, since the code doesn't make any attempt to retrieve the third normal strain component via constitutive relations when plane stress is modelled in...
by mika
28 Sep 2020, 13:07
Forum: Bug reports
Topic: zero**zero in ElementDescription.F90 [FIXED]
Replies: 2
Views: 65

Re: zero**zero in ElementDescription.F90

The devel version has now been updated to fix this.

Thanks for reporting,
Mika
by mika
25 Sep 2020, 13:16
Forum: ElmerSolver
Topic: structure frequency responses under vibration forces
Replies: 22
Views: 1615

Re: structure frequency responses under vibration forces

The issue with giving the imaginary part of a point load should now be resolved in the devel branch of the code repository. For example, if there exists a component variable "U Im 2", then the command "U 2 Load Im = Real ..." should define the imaginary part of the corresponding point load. Note the...
by mika
24 Sep 2020, 15:36
Forum: General
Topic: Inductance Extraction (MagDyn2D, MagDynPost, Circuits & Dynamics)
Replies: 5
Views: 232

Re: Inductance Extraction (MagDyn2D, MagDynPost, Circuits & Dynamics)

How about just setting "Permittivity = 0.0"? Then the total electromagnetic energy computed by the solver would be the magnetic energy.

-- Mika
by mika
18 Sep 2020, 16:22
Forum: ElmerSolver
Topic: structure frequency responses under vibration forces
Replies: 22
Views: 1615

Re: structure frequency responses under vibration forces

As it seems that a drilling rotation formulation may have a relative merit when the middle-surface is not smooth and the normal strain in the thickness direction is not of a primary interest, I updated the shell solver (in the devel branch) today to enable drilling degrees of freedom. With the new v...
by mika
16 Sep 2020, 09:25
Forum: General
Topic: total node number considered for solver
Replies: 2
Views: 299

Re: total node number considered for solver

A variable (of type Variable_t) is associated with a permutation array showing whether this variable is active at a node and how the entries are mapped in the assembly. To see the number of DOFs which are active one may test

Code: Select all

COUNT( muVar % Perm > 0)
-- Mika
by mika
09 Sep 2020, 17:17
Forum: ElmerSolver
Topic: structure frequency responses under vibration forces
Replies: 22
Views: 1615

Re: structure frequency responses under vibration forces

Another question, how to set the damping value of the harmonic analysis? I just updated the source codes of both shell solvers in order to enable mass-proportional damping. If the material section has the command Rayleigh Damping Alpha = Real ... the solver should now create a damping matrix D = al...
by mika
04 Sep 2020, 13:07
Forum: ElmerSolver
Topic: structure frequency responses under vibration forces
Replies: 22
Views: 1615

Re: structure frequency responses under vibration forces

You are right. The facet shell solver wasn't updated to assemble the mass matrix when "Harmonic Mode" = True. This is now fixed in the devel repository. At the minimum FacetShellSolve.F90 has to be recompiled in order to try again.

-- Mika