Elmer Discussion Forum

The following examples might be useful: To set a force of 1 N in x-direction at the node closest to origin in 2D: Boundary Condition 2 Target Coordinates(1,2) = Real 0.0 0.0 Displacement 1 Load = Real 1.0 End To set a force of 10 N in z-direction at the node 123 in 3D: Boundary Condition 2 Target No...

Hi Haibo ElmerGrid is a command-line tool. You probably got the installation right but you just need to run it from your command prompt. The functionality of ElmerGrid is for the most parts build in also in the ElmerGUI plug-in. Elmer suite does not include any geometry creation tools. Simple geomet...

Hi Roberto You should decleare two different bodies so that you can assign them different material parameters. Other than that I don't think you have to do anything as the continuity of the flux over the boundary is always maintained (in a weak sense). If your box is exactly as you describe and the ...

Hi John, Unfortunately scaling is not directly supported by ElmerGUI or ElmerSolver. This would be easily implemented and maybe will be done so in the future. ElmerGrid can read in meshes and write them with a different scaling when you give the command line arguments '-scale cx cy cz' where the thr...

There is no such guide. One challenge in multiphysical codes is that users are interested in a large variety of things. Stress computation and Vertex already limit the field so much that it might not fit into a Elmer for Dummies guide. Anaway, quickly browsing through Vertex homepage there seems to ...

You might apply the same methodolgy as with the computation of drag. Didn't test though but it should work if the default linear system wrapper is used witin the solver... You may compute the residual of the discrete system r=Ax-b where A does not include the effect of BCs. For stress solver the res...

The are two different ways. 1) The more accurate and consistant one uses the residual of the discrete system r=Ax-b where A does not include the effect of BCs. For Navier-Stokes equation the residual includes the nodal force vectors needed to reproduce the flow field. To activate the computation add...

The syntax you wrote should work. Are you sure that the two line segments you define really go through some element faces? In 2D you should just define the x and y coordinates and the lines should go through element edges. There has been cases when the subroutine has not worked that well. These are ...

Hi Selim I wonder if I could couple the Helmholtz equation with the Convective heat transfer equation. You can introduce some coupling. For example, the sound speed and convection velocity of the Helmholtz equation may be given. There are some underlaying assumptions and to honor them I think that t...

Hi Shawn Your syntax has at least the problem that you should decleare the type of the condition i.e. Boundary Condition 2 Target Nodes(1) = 31 Displacement 1 Load = Real 2000.0 End The reason for this is that even though 'Displacement 1' is a known keyword all the derived keywords are not defined i...