Elmer Discussion Forum

- In the main window, choose View -> Cad model... - In the cad model window, choose Model -> Preferences... - Check "Restrict mesh size on surfaces by STL density" - In the main window, open your stp file + there are more options in the CAD Model Preference Window H max = Maximum global m...

More testing shows there are regions of the mesh that the particles just don't travel through correctly. The electric field is as expected everywhere. Could mesh face orientation be a problem? Could the mesh numbering be all meshed up? I also get a weird warning when using parallel solve, something ...

It seems like there are some portions of the mesh that cause the first step to jump. I think the solver thinks the particle isn't in a valid portion of the mesh. The electrostatic field looks smooth and continuous throughout the entire domain.

False victory. Upon further work, the 1st order mesh doesn't work. The particles still jump in the first timestep. I've tried the following but there is no change: Timestep Distance = Real 1e-4 Max Characteristic Speed = Logical True Min Timestep Size = Real 1e-15 Max Timestep Size = Real 1e-10 ! Sa...

Also, it would be great if the electric field could be solved steady-state than referenced in a transient simulation and not saved at every step. My simulations are creating a ridiculous number of files of redundant information.

It seems like it's a problem with the mesh being second order. If I switch to 1st order meshing it works as expected. I thought 2nd order would produce much higher quality results, but maybe it isn't stable numerically and a different method should be used to solve it? I would really appreciate hear...

The jump in a single step is nearly the same regardless of the time step (1e-15 to 1e-9) which makes me think it's something about the mesh or spawn conditions. For example: MAIN: MAIN: ------------------------------------- MAIN: Time: 1/20000: 1.000E-15 MAIN: ------------------------------------- M...

Well, I have my test working, but once I moved to the full CAD model it doesn't seem to work correctly. On the very first time step the particles go from the initial position to a wide range of scattered locations that don't make sense.

For steady-state The errors start after 23 cores. It gives an error in allocating 24 bytes for a matrix in a piece of Fortran code. For transient The errors start after 20 cores. Error: AllocateElementVector: Unable to Allocate structured 699624 element array The PC has 28 cores and 56 logical proce...

I have a Windows PC with dual Xeons (each with 14 cores/28 logical cores). It seems if I specify more than 16 processors, ElmerSolver fails. Is there another setting I need to change?