Elmer Discussion Forum

Hi Peter, Many thanks for your inputs. Below is the full output of the solver at Level 20. I am not able to figure out why the crash happens at the beginning of the second coupled iteration. I don't use non-linear iteration within a solver and both the linear systems (heat and navier-stokes) have co...

Hi Dmitry, Your case runs fine on my windows computer as well as on a previously compiled Elmer on Ubuntu (both running Elmer-8.3) but not on my newly installed Elmer on Ubuntu (compiled using cmake). So it looks like something is wrong with either my compilation or the mesh as you said. I'll recomp...

Hi all, I am running coupled navier-stokes and heat solvers (with phase change activated) to study the solidification of a steel casting. I use a newly compiled version (using cmake) to get rid of the hassled iteration counter as mentioned in this thread: http://www.elmerfem.org/forum/viewtopic.php?...

Dear All, What Dmitry remarked is what exactly what I had observed too. In 3D flows, the relaxation factors of both solvers have to be reduced so low (< 0.1) that they are no longer usable. I noticed that in 3D cases, the k and epsilon solutions have a tendency to oscillate more wildly than in 2D do...

Hi Dmitry,

Thanks very much for your working case file and observations!! I will do these and a couple of other modifications and will get back to you. As you suggested, I need to make sure there are no issues with the mesh.

Dear All, I am trying to simulate solidification of hot metal in a cavity (top isolated; cooled from other 3 sides) using heat and navier-stokes solvers with 'spatial 2' phase change model and Boussinesq body force. I need to model the liquid part like a porous media, so I added Porous Media in the ...

You are most welcome Paul! Perhaps we can learn something together. As I said before, I never had any serious issues with 2D problems. The solver settings in the above example almost always worked well with NS and k-epsilon (also with sst-komega). It would be very nice if we could identify a couple ...

Dear All, I have been experimenting with Elmer for some time to model a few different turbulent flows and have gathered a few observations. (1) In my experience, Elmer is quite good at modeling 2D turbulent flows using Navier-stokes and k-epsilon solvers, even in the case of moderate to high turbule...

Thank you for the great work John and Anil. However I couldn't understand one simple thing here: How could you get the thermal stress distribution in the solid without the heat solver?

Thanks/Regds
kumar

Dear Elmer Users, I have been trying to solve some flow modeling problems with Elmer's Navier-Stokes solver by using Hypre as the Linear System Solver, with no luck so far. To simplify the discussion, I am attaching a 2D model problem - i.e., the classical backward step. Water enters through the nar...