Search found 240 matches
- Yesterday, 09:45
- Forum: ElmerSolver
- Topic: UMAT and mortar BC, 3
- Replies: 1
- Views: 85
Re: UMAT and mortar BC, 3
Thanks for suggesting this - What might not yet be ideal is that the test UseUMAT = ListCheckPresentAnyMaterial(CurrentModel, 'UMAT Subroutine') leads to altering the way of computing loads in a coupled analysis even when the solver doesn't use UMAT in any way. Probably it would be better to apply a...
- Yesterday, 09:15
- Forum: General
- Topic: Sound Damping variable distance in Elmer Helmholtz
- Replies: 3
- Views: 81
Re: Sound Damping variable distance in Elmer Helmholtz
It seems that Elmer really generates a source term from the given Pressure Source definition. I believe it may make only a very small modification of the model. You might notice a change if the source is scaled to make it larger.
- 17 May 2024, 17:43
- Forum: ElmerSolver
- Topic: Can't I use a 2nd order mesh with the acoustic solver?
- Replies: 4
- Views: 82
Re: Can't I use a 2nd order mesh with the acoustic solver?
If you have a mesh consisting of second-order nodal elements (and avoid giving a conflicting element command "Element = p:..."), the solver should create a discretization based on second-order approximation of all fields. Such solution may however be unstable so it may suffer from spurious...
- 15 May 2024, 11:37
- Forum: ElmerSolver
- Topic: Can't I use a 2nd order mesh with the acoustic solver?
- Replies: 4
- Views: 82
Re: Can't I use a 2nd order mesh with the acoustic solver?
This is an old solver which was designed to use the lowest-order basis functions together with additional bubble basis functions to get a stable method. Therefore the second-order basis is not supported by this implementation. The given element definition of the form Element = "p:1 b:n" ma...
- 15 Apr 2024, 14:40
- Forum: ElmerSolver
- Topic: Stress Solver - Pre-strain is not applied?
- Replies: 4
- Views: 262
Re: Stress Solver - Pre-strain is not applied?
After checking the solver code I think a given Pre Strain is used only in special cases where the effect of geometric stiffness is activated (Stability Analysis = True or Geometric Stiffness = True). If you update to get the change https://github.com/ElmerCSC/elmerfem/commit/48ade7a16ddaeee4ceefe731...
- 11 Apr 2024, 13:14
- Forum: ElmerSolver
- Topic: Timoshenko Beam Solver and Conforming Boundary Conditions
- Replies: 5
- Views: 289
Re: Timoshenko Beam Solver and Conforming Boundary Conditions
Do you know whether this change in the routines will happen soon? If you update to obtain the change https://github.com/ElmerCSC/elmerfem/commit/7a166454a4559e7518da7f1ae79ab01f1aa44250 it might now be possible to apply Conforming BC in connection with a 1-D model. I also added a simple test https:...
- 10 Apr 2024, 14:01
- Forum: ElmerSolver
- Topic: Timoshenko Beam Solver and Conforming Boundary Conditions
- Replies: 5
- Views: 289
Re: Timoshenko Beam Solver and Conforming Boundary Conditions
Do I need to put additional input there? I would expect not as CBC should just replace the dofs with the corresponding node and checked a test . I think there is a problem in the library subroutines that prevents the creation of constraints when the boundary is defined in terms of point (101) eleme...
- 10 Apr 2024, 10:18
- Forum: ElmerSolver
- Topic: MgDyn2D and high-order element
- Replies: 7
- Views: 517
Re: MgDyn2D and high-order element
Here the keywords "Quadratic Approximation" and "Use Piola Transform" relate to the 3-D solvers where the discretization is done in terms of curl-conforming (edge element) basis functions. The 2-D version uses standard basis functions and doesn't need these commands. However it m...
- 05 Apr 2024, 09:33
- Forum: ElmerSolver
- Topic: Plane wave in the acoustics solver
- Replies: 1
- Views: 230
Re: Plane wave in the acoustics solver
Some comments on the BC named as "symmetry": - to obtain symmetry the normal component of the velocity should be set to be zero, together with the do-nothing (default) BC for the temperature - if a component of velocity is specified, the corresponding component of the surface traction cann...
- 29 Mar 2024, 13:21
- Forum: ElmerSolver
- Topic: Helmholtz BC vs. Acoustics BC
- Replies: 2
- Views: 898
Re: Helmholtz BC vs. Acoustics BC
Suitable BCs are explained in Section 13.2.2 of the documentation https://www.nic.funet.fi/pub/sci/physics/elmer/doc/ElmerModelsManual.pdf as "For example, outgoing waves may be approximated by setting Z = −rho_0 c and ZT = −iω/c on the outflow boundary". That is, one has to give also an im...