Elmer Discussion Forum

Seems I answered my question. To resolve I did the following shell commands in the project directory: mv mesh.nodes mesh.nodes.z awk "{printf (\"%g %g %g %g %g\n\",\$1,\$2,\$3,\$4,0)}" < mesh.nodes.z > mesh.nodes The result was a mesh.nodes where the z-coordinate was forced exact...

Hello Elmer users, I try to make a 2D axi symmetric thermo mechanical analysis using the GUI. The simulation section of the generated .sif file is: Simulation Max Output Level = 5 Coordinate System = Axi Symmetric Coordinate Mapping(3) = 1 2 3 Simulation Type = Steady state Steady State Max Iteratio...

OK, so the instability in the transient run was (of course) courant number related, i.e. shorter timesteps required. Here is the history with 10m/s at inlet, air, timestep 0.5ms and the 51 video frames are 2.5ms apart: https://u.pcloud.link/publink/show?code=XZCl2GVZuDfFm1bSxNpMuNCX7ofWLfsI1rHk Look...

So the answer is "Yes". Avoid the "-autoclean" in mesh conversion from UNV. One way is to convert manually with: ElmerGrid 8 2 Mesh_1.unv ElmerGrid help explains what happens with "-autoclean": -removelowdim : remove boundaries that are two ranks lower than highest dim ...

One experiment is a transient simulation to see what happens. Length of volume is 0,5m and velocity is 1 m/s The video linked to below shows what happens with velocity. Individual frames are spaced 0,2s. https://u.pcloud.link/publink/show?code=XZ26BGVZKuAT81OztP7Ur6U1A5dfzHo3z5hV Apparently somethin...

Calling experienced Elmer users ... I am struggling some to learn to use the CFD capabilities of Elmer. Once I get there I will explore convection in a heatexchanger. I started with a base case - flow over a step - as in the examples section, but in 3d instead of 2 and with air from the builtin mate...

Thank you also (kevinarden) for the hint on execution and mesh handling.
It seems that the GUI for N dimensional space mainly considers N-1 dimensional boundaries.

Thank you, I am considering a 3D Static Current Conduction with prescribed Voltage along a line as one of the boundaries.

Dear Elmer users, This question is about geometries for boundary conditions and geometry order. If I have a model in 3D space (volume) is it possible to apply a boundary condition on a 1D geometry (line/edge) entity or even a 0D (point/node) entity? in general? using the GUI on a UNV format mesh pro...

Thank you very much Rich_B and Peter Råbak

Just what I needed. In the GUI "Steady State Max Iterations" is defined in the menu: Model->Setup and the "Steady State Convergence Tolerance" is defined per solver in the Equation settings.