Search found 244 matches
- 24 May 2024, 09:55
- Forum: ElmerSolver
- Topic: wrong displacement values using "ElasticSolver"?
- Replies: 24
- Views: 341
Re: wrong displacement values using "ElasticSolver"?
According to the manual Large Deflection = False only shows up in the shell solver, not ElasticSolver I did a mistake in recommending the use of the keyword Large Deflection in this connection. ElasticSolver understands it only when material model is described as UMAT subroutine. Here it shouldn't ...
- 24 May 2024, 09:45
- Forum: ElmerSolver
- Topic: wrong displacement values using "ElasticSolver"?
- Replies: 24
- Views: 341
Re: wrong displacement values using "ElasticSolver"?
IMHO the problem is linear Here Young's modulus E = 5e+6 while the intensity of applied surface force (traction) s = 5e+5, so in an uniaxial test one might expect a linearized strain ~ s/E ~ 0.1. I therefore think that nonlinearity starts to play a role. If I set for example E = 5e+11 so that the a...
- 23 May 2024, 09:31
- Forum: ElmerSolver
- Topic: Nullify an old WhitneyAVHarmonicSolver solution
- Replies: 1
- Views: 44
Re: Nullify an old WhitneyAVHarmonicSolver solution
I'd try to give
Linear System Nullify Guess = True
Linear System Nullify Guess = True
- 23 May 2024, 09:24
- Forum: ElmerSolver
- Topic: wrong displacement values using "ElasticSolver"?
- Replies: 24
- Views: 341
Re: wrong displacement values using "ElasticSolver"?
there is nothing non-linear in the solution If ElasticSolver is used, the strain measure will be a nonlinear function of displacements. If nothing special is given in the sif file, the nonlinear measure of strain is computed as E = 1/2 [grad u + grad u^T + (grad u)^T(grad u)]. StressSolve neglects ...
- 20 May 2024, 09:45
- Forum: ElmerSolver
- Topic: UMAT and mortar BC, 3
- Replies: 1
- Views: 116
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...
- 20 May 2024, 09:15
- Forum: General
- Topic: Sound Damping variable distance in Elmer Helmholtz
- Replies: 3
- Views: 122
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: 118
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: 118
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: 283
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: 307
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:...