Elmer Discussion Forum

Hi, We have updated the devel version of the ElasticSolve module today so that the solver of Elmer can output user-defined state variable fields (with "Output State Variables = True") to a result (vtu) file and then they may be visualized as usual. The way how UMAT variables are created an...

I just mention that a term v x curl A has now been implemented into the 2D solver as well (available in the fresh devel version of Elmer).

-- Mika

Hi, In the fresh devel version of Elmer there should now be an option to specify a velocity field v (by using the keywords "Lorentz velocity i" in Body Force sections) in order to add the term -sigma * (v x B) = -sigma * (v x curl A) to the 2D equation. Postprocessing via using the solver ...

Hi, I try to understand how the simulation has been organized in the sif file. The field "Magnetic flux density" is usually obtained via postprocessing after the solver of MagnetoDynamics2D has produced the primary solution. Do you have two solver sections which both have MagnetoDynamics2D...

I checked that the StressSolver and ElasticitySolver give consistent results for small loads. Could there be some difference in the specification of the load for the different software? What is the resultant couple vector you expect to obtain at the fixed end?

-- Mika

I made some small changes to your sif files. After that the standard material model and the UMAT version as available from UMATLib give the same results. To have the same Poisson's ratio 1.E-12 the material constants array must be defined for the example implementation of UMATLib as Material Constan...

Hi, It should be possible to give distributed loads on edges if these edges have been identified by group numbers in the mesh file mesh.boundary. In a 3D model one often lists only the faces which make the boundary of the 3D body, but additionally some edges may be listed as well. The keyword "...

Elmer utilizes the return values of UMAT to perform (inexact) Newton's iteration, so that a linear system is constructed to obtain the solution increment. In very loose terms I'd say that the returned derivative of (Cauchy) stress response function offers a substitute description for the effect of h...

If ElasticSolver finds that a UMAT Subroutine has been specified, it doesn't use the standard keywords to seek for the basic material parameters such as Young's modulus and Poisson's ratio from the sif file. Instead such parameters are expected to be specified by using the keyword Material Constants...

Elmer doesn't have any state variables which would be allocated by default. Therefore it's a user's task to specify the count of state variables (the keyword command Number of State Variables = Integer ...) and use them consistently within the user-supplied umat subroutine. In practice, outside the ...