Elmer Discussion Forum

It seems that the command

Variable 2 = Timestep Sizes

leads to a run-time error, so this row should be deactivated. Timestep Sizes might not be a proper variable that SaveScalars could handle, while Time may be given as a target variable.

-- Mika

This seems very strange. Can you run a similar test case

https://github.com/ElmerCSC/elmerfem/tr ... ts/WaveEqu

without an error?

AV {e} sets the edges, but confused as to why the AV {e} 1, 2 and 3 terms are needed For the documentation of setting Dirichlet BCs for curl-conforming basis functions see the section F.2.5 of Appendix F: https://www.nic.funet.fi/pub/sci/physics/elmer/doc/ElmerSolverManual.pdf As explained there, w...

If I run your case after these changes, with Pre Strain(3) = Real 5e-1 5e-1 0.0 ... Geometric Stiffness = True ... Strain Load(3) = Real 5e-1 5e-1 0.0 I see a sensible result that the solution doesn't change in the two-step analysis ComputeChange: NS (ITER=1) (NRM,RELC): ( 0.25774787 2.0000000 ) :: ...

I also think that some signs in the code have not been consistent with the energy principle. As an attempt to correct this a fresh commit changes these signs as

https://github.com/ElmerCSC/elmerfem/co ... 2a46b846be

So Material Pre Strain/Stress are only valid options when Eigen Analysis = True Actually given Pre Stress/Strain affects the assembly in the second solution step also when Geometric Stiffness = True regardless of the value of the keyword Eigen Analysis. Then a prestressed stiffness matrix is create...

I still can't find any combination of options which enables the Material "Pre Strain" or "Pre Stress" options to have any impact on the simulation If one defines Geometric Stiffness = Logical True then the command Eigen Analysis = True is also needed. In addition, the number of ...

Some cosmetic changes were made to the code (https://github.com/ElmerCSC/elmerfem/commit/8177df340813cda31e02373bc7f22abcab40c25d): - Pre Stress and Pre Strain were added to the list of the known keywords. They are now read from a material section only when Stability Analysis = True or Geometric Sti...

The comment cited should be understood to mean that in the documentation the explanation of the equations over moving media is only done in the case of rigid motion. In principle the solver doesn't suppose anything uncommon. If the velocity field is more general, it's just left for the user to set t...

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 ...